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Home » Kitchen » Gas Furnace – Burner Goes Out

Gas Furnace – Burner Goes Out

kitchen 3d maxSymptom – Burner lights off, however goes out quickly.

This Year's Scrap, Next Year's Washing Machine - - 749353.jpgWhat is it? – This symptom is commonly brought on by a dirty flame sensor that may be simply cleaned. They are powered by a single wire carrying a small quantity of electricity (less than 10 DC microamps). Not all furnaces have a flame sensor, however if your furnace has one, it is going to be mounted close to the burner with the metallic rod positioned in the flame. Flame sensors fluctuate in size (2 to four inches) and form (see examples under).

What is happening? – Over time, a coating can kind on the steel rod of the flame sensor that’s difficult to see. Damaged or cracked ceramic are signs that the flame sensor is defective. Due to this coating, electricity stream is restricted and the furnace control system “thinks” the burner has did not light and shuts off the gasoline as a security measure even though every little thing has worked as designed. Flame sensors not often fail.

The restore

1. As all the time, flip off all electrical power to the furnace if you are performing this restore. 2. Steel wool or a advantageous sand paper can be utilized to “polish” (clear) the sensor rod and take away the coating. 4. Turn the ability back on and verify the furnace for correct operation. 3. After cleansing is full, change the flame sensor. Remove the flame sensor.

Notice – If this restore does not restore normal operation call totally free diagnosis assistance or bring the flame sensor in to the U-Fix-IT Appliance Elements store without cost testing and inspection.

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Extra From Jim Plummer

Jim is an ex-Air Power pilot and a enterprise school graduate of College of Texas at Austin. He has been within the equipment components business since 1975.

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88 Responses to “Gas Furnace – Burner Goes Out”

1. Danny Palmer says:
March 25, 2020 at 10:Forty five am
I’ve cleaned the low flame sensor and replace it. Does the flame go out throughout the blower stage or is there one other problem?

– Jim Plummer says:
March 25, 2020 at 12:36 pm

If the flame comes on and then goes out in a short time, that is traditional symptom of a flame sensor or a foul ground for the control board. Variations from that symptom can be pointing to another malfunction.

2. Paul OBrien says:
March 13, 2019 at 2:25 pm
Thanks for this tip. This 5-min fix saved my family a ton of discomfort. We’re in the course of a Colorado blizzard, and that i wouldn’t ask a tech to be out on the roads right this moment.

– Jim Plummer says:
March 15, 2019 at 9:33 am
Howdy Paul,
Hooray for you and your family! We love it once we hear that we made a distinction in your day. Jim Thank you for letting us know.

3. Robert says:
February 27, 2019 at 3:09 pm
My York furnace blinks 7 times over and over. I modified the flame sensor rod however nonetheless no heat and same code remains to be blinking. What’s ought to my subsequent step be

– Jim Plummer says:
March 1, 2019 at 9:17 am
7 blinks is the error code for “flame could not be established.” The traditional symptom for flame sensor is: the burner flame comes on but goes out inside seconds. Cleaning or changing the flame sensor is the same old solution. You did not point out if you’re experiencing these symptoms after replacing the flame sensor

Chair covered with clothI might observe the ignition sequence. The flame ought to impinge on the flame sensor. The burner ought to produce a gradual blue flame. The management board should be grounded. The flame should ignite with out delay.

The management board sends out a really low voltage to the flame sensor that conducts by way of the flame to ground and back to the management board. If the flame doesn’t burn steadily on the flame sensor it may possibly interrupt the circuit. The management board will “time out” if it doesn’t detect the flame (low voltage) throughout the time interval. If the flame is gradual to mild the “time out” can happen regardless that there is an efficient circuit again to the control board.

Sluggish ignition just isn’t a typical downside. The ignitor, the gas valve, and gasoline pressure is usually a think about those symptoms.

Name the U-Fix-IT Appliance Parts retailer nearest you without cost personalized analysis assistance. Thanks in your inquiry.

4. Abel says:
February 11, 2019 at 10:24 am
I’ve a comfortmaker gas furnace. Its fitted with 2 rollouts and one essential limit change. I can’t locate the flame sensor.

Is that this frequent for the manufacturers to place foremost limit change as a substitute of a flame sensor?

My furnace goes on and off and gives 4 blinks. Ought to I exchange major restrict change or the rollouts? According to the chart four blinks means limit swap open.

– Jim Plummer says:
February 11, 2019 at 10:36 am

A restrict switch doesn’t perform the identical operate as a flame sensor. A limit switch capabilities to prevent dangerous overheating by shutting off the flame to prevent fires. The flame sensor detects the presence of a flame.

A restrict swap will be tested using an ohm meter. With no wires hooked up to the limit change the reading between the 2 terminals ought to be the same reading seen when the two probes of the ohm meter are touched together. Alternatively, the restrict switches and rollout switches could be examined totally free at your nearest U-Repair-IT Equipment Store, or name for free diagnosis assistance. Thanks to your inquiry.

5. Jean Fee says:
February 2, 2019 at 10:Fifty eight am
I have an Amana pure gas direct vent furnace. Gasoline and electric cleaned and did every thing they might. Attempting to attend until Monday so I don’t have to pay weekend service fees. It is not going to work over 67 levels. hassle with sensor three yrs. Girard substitute sensor. The furnace was on 70 levels labored four just a few days. Sent me to Girard who I bought it from. They got here three times charged $300 every time lastly changed sensor Jan 25. Still similar problem. woke up twice this week to 62 levels. After turning on and off downstairs and decreasing the temp to 67 levels it cycles on and off.

Keep having this drawback. there is a trouble code in furnace and flashes 5 instances, which we all know from Girard this implies a foul sensor. They simply changed it and this remains to be the code we get.

Any concepts advice

– Jim Plummer says:
February 4, 2019 at 4:Forty five pm
Hello Jean,
I can tell how irritating your scenario has become. The Amana error code chart I looked at for five flashes learn, “sensing flame and not using a name for heat attributable to possible slow closing valve.” If this error code matches your furnace mannequin quantity, then the error code is pointing toward a defective gas valve.

I might begin by verifying the error code I discovered is a match in your furnace. I am guessing that the error code is intermittent, so I could be ready to cycle the valve plenty of occasions before the malfunction and the error code seems. When the facility is minimize off to the fuel valve, the burner should exit when the voltage is turned off by the board. If it does match , I would show the malfunction by using a multimeter to learn the voltage powering the fuel valve.

For more personalized help call the U-Repair-IT Equipment Elements store nearest you without cost analysis help. Thanks in your inquiry.

Kitchen_Hood.jpg6. Brian dennis says:
January 26, 2019 at 9:Forty am
I’ve had my sensor cleaned twice the last 2 months as it has stopped working, orange flame. Can dryerblintbblock the sensor since my dryer is close by? Additionally, if the flame begins orange after which imediately changes to blue right now, is that ok?

– Jim Plummer says:
January 26, 2019 at 3:31 pm
You mention your dryer, however your query is on the furnace page. Your question isn’t clear to me.

You seem to be asking if the furnace operation might be affected by the dryer being positioned shut by. If the two models are working in a tightly enclosed space, then it is feasible that they could also be starving for makeup air to substitute the air they are pumping outdoors. Both dryers and furnaces require make-up air to offset the air they’re pumping exterior.

Please write again if I did not answer the query you meant to convey or name the U-Repair-IT Appliance Parts Retailer nearest you totally free analysis assistance. Thank you on your inquiry.

7. Matthew Coppola says:
January 24, 2019 at 10:57 am
Hi we just switched from oil to propane. Was getting a flame three tries after which the blinking 3 red lights. Have had propane provider verify all pressures..inlet, outlet, manifold. One other model new burner was introduced in and is doing the identical factor. The 1st burner was doing the basic 3 attempts after which out. Any advice? Furnace is a Miller CMF80-PG-DI. It is a smaller furnace is it’s heating a mobile dwelling. All are at operating requirements.

– Jim Plummer says:
January 24, 2019 at 3:Forty eight pm
When a new malfunction appears after work has been completed, I retrace all of the steps of what was carried out trying at the gadgets that may have been disconnected to facilitate accomplishing the main work. I could be searching for wires, hoses, and brackets that will have been reconnected incorrectly.

On this case I’d look fastidiously at the wires and hoses connected to the strain swap. Common pressure switches often have two attainable connections for the hose. I’d verify both ends of the hose are linked and there are not any holes.

If the furnace has operated accurately since the conversion, I would replace the stress switch, since 3 flashes points towards the strain change.

8. Kim Spencer says:
December 27, 2018 at 1:Forty two pm
My gasoline electric begin furnace retains going out. One of his coworkers put the tiniest half in saying you dont wish to contact or it may not work. 5 years ago it went out. I all the time change the filter and I’ve been cleansing it when its turned off. Which I have been getting it going. Thank you! Kim The next day it will likely be out again. He gently put it in however I cant remember what it is! My husband was a utility Forman in a gasoline company in IL and hes passed away at 55. So I’ve been making an attempt to work on the furnace myself.

– Jim Plummer says:
December 31, 2018 at 9:59 am
Good day Kim,

I cannot be certain which half was replaced from your description. Thanks for your inquiry and have a cheerful New Yr! . Give us a name at 817 472-7740 totally free analysis assistance and we will help you establish why your furnace will not be working. Ceramic igniters are probably the most delicate half on a gas furnace.

9. Darwin Fure says:
December 26, 2018 at 10:19 am
Thanks to your advice saved four hundred dollars. Thanks alot

– Jim Plummer says:
December 27, 2018 at 8:26 am

Wow, It’s nice to listen to a few win like that. Have a contented New Year!

10. Darwin Fure says:
December 17, 2018 at 3:Forty six pm
How many occasions can a flame sensor be cleaned earlier than it needs to be replaced,mine has been cleaned twice during yearly upkeep verify performed purchase certified furnace tech. The place can i order one to have available in case of an emergency. The model number of my furnace is xv95 mannequin number tuh2b080a9v3va
Thanks Darwin My furnace is a Trane and 10 years old. and that i reside in Minnesota and is likely to be a good idea to have an additional one available.

– Jim Plummer says:
December 17, 2018 at 5:Forty one pm
Good day Darwin,

Sensors go unhealthy when the ceramic insulator cracks, in any other case they are often sanded endlessly. There aren’t any inside elements, it is a metal rod mounted in a ceramic insulator. It would be simpler to imagine if the coating we sand off was seen in a roundabout way. The overwhelming majority of flame sensors we sell change good sensors regardless of us recommending towards it. The low voltage that is transiting the flame sensor through the flame is easily blocked by the invisible residue that builds up on the sensor.

When sanding the insulator doesn’t correct the issue, many people will substitute it, “just to make sure,” before on the lookout for the malfunction.

I’m pleased to sell you a standby replacement sensor if you need one. Thanks for your inquiry. You’re more likely to need a safety restrict, a stress switch, a capacitor, a draft inducer motor or a blower motor over the life of your furnace. Call us at 817 472-7740 if you would like us to ship you one. I don’t advocate it, because it nearly all the time needs gentle sanding and it nearly never needs replacing.

11. Christopher G Lewis says:
November 28, 2018 at 7:00 am
I don’t think my furnace has a flame sensor ride if that’s the case I cannot discover it

– Jim Plummer says:
December 4, 2018 at 1:Forty three pm

Call the 817 472-7740 at no cost customized assist in diagnosing your signs. Thank you on your inquiry. Have your mannequin number when you name.

12. Melissa says:
November 16, 2018 at 12:28 am
My flame sensor has been cleaned a number of occasions over the past seven years but this final incident wanted changing. Earlier than replacing the flame sensor my furnace would try to turn on in intervals of three.
With flame sensor changed the furnace works but now repeatedly turns on and fulfills three cycles (similar interval anount)

Damaged – Tried to ignite in threes.
Changed – Ignites in threes.

– Jim Plummer says:
November 17, 2018 at 4:Thirteen pm
Good day Melissa,

I’m not sure what your signs are from your description. Thank you on your inquiry. Please name the nearest U-Fix-IT Equipment Parts for personalised analysis help.

13. Denise King says:
November 10, 2018 at 4:00 pm
My furnace was on however won’t minimize off, what is this downside. I guess the control swap. I solely can minimize it off by the switch on the wall. How much please? What makes it not go off and is that this expensive.

– Jim Plummer says:
November 13, 2018 at 5:31 pm
Whats up Denise,

You have not given sufficient data that I will be of help. You can call U-Repair-IT Equipment Components at 817 472-7740 at no cost personalized assist in diagnosing your furnace.

Thank you in your inquiry.

14. Ed silva says:
February 7, 2018 at 6:Forty two pm
I’ve a York furnace, keeps shutting on and is on, flame comes on, replaced flame sensor..nonetheless the identical problem..

– Jim Plummer says:
February 21, 2018 at 1:37 pm

It’s exhibiting the basic signs of a flame sensor drawback. I might examine all the safeties related to the control board. If everything checks good, that may lead me to consider the management board is dangerous. I might make certain the flame is impinging on the flame sensor. I might check the furnace management board has a good floor.

Name the nearest U-Fix-IT store for customized free troubleshooting help.

15. Steve says:
February 3, 2018 at 10:Forty two am
My gas furnace would cycle endlessly and never begin. The recent igniter would come on, the exhaust blower would come on, then the main burner fuel would come out and ignite, then about 2 seconds later, it could go out, shut down intentionally by some valve. Then the cycle would start once more.

I took out what will need to have been this flame sensor, and, regardless that it did not look very dirty, brightened it up a bit of with a inexperienced scotchbrite pad, wiped it off, then put it back.

Now my gas furnace is operating. Maybe I mounted it?

– Jim Plummer says:
February 21, 2018 at 1:Forty seven pm

Yes, It appears like you probably did repair it. Flame sensors purchase an invisible coating over time which may block the stream of a very low voltage from the sensor by means of the flame and again to the control board. The board shuts off the gas at any time when it does not detect the voltage. Good job!

16. David G. says:
April 21, 2017 at 3:57 pm
Okay. Jim
How about this I have an Air Professional bgu10016a ( coleman ) and have simply recantly changed the primary fan motor. So what would you say is my next coures of motion wanting an axe needs to be? After the succsesful repalcement, the furnce would light then exit also exhibiting the false flame sensor code. “Simple In poor health clear it” or so I assumed, cleansing the sensor was no help. Now I’ve a new flame sensor and the same old drawback.

– Jim Plummer says:
April 22, 2017 at 2:35 pm
David G.

You’ve gotten been doing the things that make sense. If it was my furnace, I would check that all the safeties have continuity, the flame is impinging on the flame sensor, and I might make certain the control board has an excellent ground. If all those check out, then I might exchange the management board. Call the closest U-Repair-IT retailer if you have questions.

17. Mike says:
November 6, 2016 at 2:31 am
My furnace ignites and instantly goes out it cycles three times before stopping fully… cleaned sensor nonetheless not working even modified air filter please help no cash 66 degrees now and dropping

– Jim Plummer says:
November 8, 2016 at 4:Forty one pm

I might make certain the management board has a very good ground after which I would locate the wiring diagram on the indoor unit. Furnace control boards often have flashing lights that point out error codes that are explained on the wiring diagram. You can take your wiring diagram to the nearest U-Repair-IT retailer for customized help on find out how to proceed with the troubleshooting. Any open safety is bad and ought to be changed. If there are no error codes to comply with, I’d discover the safeties shown on the diagram and test them for continuity.

18. Singhm says:
October 4, 2016 at 11:03 am
Now we have Benton bg-450 burner..its tripping in each 30-forty minutes with error code of 7 which shown in guide that downside may be in fuel valve,electode is grounded or dangerous setting of burner.I’ve replaced electrodes and controller and checked floor.However drawback not solved…please assist

– Jim Plummer says:
October 10, 2016 at 5:45 pm

Sadly, I don’t have any answer for you. Oil burners will not be a product generally offered here in Texas. Thanks for your inquiry.

19. Brian Topping says:
February 12, 2016 at 4:07 am
I’ve two boys in school right now very expensive and cash is tight . I examine how to fix this downside as my furnace would gentle however wouldn’t keep lit. !!!!!!! Have a terrific day! OMG Thank you Thanks Thank you saved me some huge cash!

20. Jerry D says:
January 26, 2016 at 1:18 am
Thanks Jim!!
I obtained dwelling tonight and my thermostat read 58 levels when it was set to 67. I tried resetting it at the fuse box to no avail. Thank you a lot! I came across your useful article and with solely removing three screws and about 10 minutes time my heater is working again! You saved me a whole lot of stress, time and money.

Bedtime stories 2 - free stock photo– Jim Plummer says:
February 1, 2016 at 12:52 pm

Glad to listen to we helped you.

Thank you for letting us know.

21. Mark says:
January 25, 2016 at 9:33 pm
Last summer I had a leak in the ac condensate tray. A replacement of the fuel valve corrected the problem for some time. It brought on the fan to turn on randomly however the ac always worked. I changed the board only to search out that the problem still existed. Not even the draft motor would come on. Within the fall it was time for heat and nothing.

I now have chronic random cases of the burner both not lighting or lighting and immediately shutting down. Generally hours, typically days however has always come again. Typically If I cycle energy, and even take away the igniter and flame sensor and then reinstall (no cleansing) the systems works advantageous for some time. No change so I removed it. Any recommendation? I am stumped. I’ve even added second ground traces to see if that may assist.

– Jim Plummer says:
February 1, 2016 at 12:58 pm

Random malfunctions are probably the most tough to troubleshoot and there is no such thing as a straightforward answer here. Use the wiring diagram and a volt meter to start the process. Call the U-Repair-IT retailer nearest you for personalized help in locating your problem. Is the low voltage system producing the proper voltage? Troubleshooting can only happen while the system is working incorrectly. Is the control voltage current at the fuel valve when it fails to light?

22. Bill Thoms says:
January 24, 2016 at 12:40 pm
I have similar cycling downside but have no flame sensor. No lo v wire in any respect. Schematic says i have a pilot sensor however the one factor going to it is the ignition wire.

– Jim Plummer says:
February 1, 2016 at 1:17 pm

Name the store nearest you for extra personalised help. We might want to see your schematic to get you started in the suitable route.

23. Tammy says:
January 17, 2016 at 3:21 pm
After cleaning flame sensor, checking ground, board connection, exhaust for blockage and none of that fixed it. It seems to be mounted now. We discovered the exhaust pipe hanger was poorly hung and was working its approach out and this triggered the exhaust to droop and hold condensation which would shut the unit off additionally.

– Jim Plummer says:
January 23, 2016 at 4:53 pm

Your experience is the explanation I at all times fix whatever is just not right, even when it appears unrelated to the problem I am trying to unravel. The seemingly unrelated little factor has typically proved to be the cause of the bigger drawback.

Good job finding the issue. Thanks for sharing.

24. David says:
January 17, 2016 at 9:44 am
my Gas furnace come on and lights, it stays lit till the primary burner kicks on . as quickly because the burner kicks on the flame goes out. I’ve cleaned the flame sensor and I’ve even checked the sensor appears to be working. might you please help.

– Jim Plummer says:
February 1, 2016 at 1:20 pm

Your description is the classic symptom of a dirty flame sensor. Call the U-Fix-IT store nearest you for additional help. You’ll have a nasty management board. If all of your safeties check good and the control board floor is good.

25. Chris says:
January 2, 2016 at 7:02 pm
Thanks in your information. Comfortable new year. Simple repair and very easy to do. Glad I found you and saved some money.

26. Jim Sachs says:
December 30, 2015 at 10:05 am
Dear Jim,

Thank you in your service to the USA! I adopted your instructions and all is working positive now. I really appreciate the advice on this situation. Thank you again!

Jim Sachs

27. Tim says:
December 27, 2015 at 1:47 pm
Thanks! 10 minutes of my time and it was fastened! Now to invoice my landlord…. 😉 LOL

28. Brent says:
December 25, 2015 at 3:31 pm
Woke up for Christmas solely to find our home was 63 degrees on a 30 diploma day. I knew there wouldn’t be much luck in getting a repair man out today without spending enormous dollars. Discovered this article online and carried out the repair.

The furnace has worked all day since with no issues.

Thanks for the nice advice.

– Jim Plummer says:
February 1, 2016 at 1:Fifty eight pm

Glad we might assist.

Thanks for letting us find out about your success.

29. Dan H says:
November 27, 2015 at 9:08 pm
I was laying in mattress half-hour ago noticing that the burner was kicking off after about 5-10 seconds of burning, did a quick Google search, eliminated, sanded and reinstalled the flame sensor and all is properly now. Oh thank goodness for the Internet! !!. It would have been a chilly night and much $ and frustration to name the “furnace man” out tomorrow to do what I simply mounted myself.

Dan H.
Lake Sherwood, MO

– Jim Plummer says:
November 28, 2015 at 10:20 am

Thanks for telling your story. It all the time fun to listen to that we made someone’s day higher.

A heat night’s sleep is a ravishing factor.

30. B Russell Sprout says:
November 10, 2015 at 4:11 pm
Hi Jim,
Let me start by saying Thank you for your military service! We wouldn’t be an superior country with out selfless veterans like your self.

I have a Luxaire gas furnace that’s giving me matches! I’ve seen flame sensors earlier than that doubled their size due the the construct up and they still labored. This one has been shined like a mirror and will solely permit one or 2 cycles earlier than the furnace shuts down once more! Can you clarify? Used sand paper and emory cloth. There are 4 burners which can be to have a blue flame once the igniter heats the gasoline. Only 2 of mine mild. I’m at a loss to clarify it! “They” say that sensors hardly ever go dangerous and cleaning is about all they want but the place am I going improper! The one straight behind the igniter and the one beside it. The other two is not going to mild until I clear the flame sensor which I have accomplished a half dozen occasions in every week!

31. Shannon says:
November 7, 2015 at 1:05 pm
I have a Lennox furnace and my flame sensor is related to a metal pipe and one other piece it doesn’t just come out like I seen in videos. I bought a code blinking 7 times and its said its the flame sensor isn’t grounded. My furnace comes on for 1 minute then shuts down. I don’t know what meaning? I can take the screw out and clean the highest of the sensor but like I said its connected to other pipes and things. Any options would help. Thanks.

32. Cap says:
October 30, 2015 at 2:08 am

33. John Doe says:
October 23, 2015 at 9:10 am
Nice try, however you’re improper. The flame rectifies the AC voltage to DC voltage ( the flame is a horrible conductor and only conducts half the sine wave altering the AC to DC voltage) and the ignition board is in search of 3-5 microamps by way of the ground. The ignition board delivers 90-120V AC low amp by way of the flame sense rod.

– Jim Plummer says:
November 23, 2015 at 5:Forty pm

Thank you for the memorable clarification of the rectification process.

34. Frank says:
April 27, 2015 at 6:57 pm
I too had the identical symptoms and after spending over three hundred dollars on a new sensor, control board, and igniter all of which left me with the identical problems. Once I cleared it out the heater fired up and worked fantastic. Since i kept all of the elements I replaced I won’t need to spend any cash if one of those objects should ever go unhealthy. The perpetrator occurred to be a Robin determined to construct a nest in the chimney stack.

– Jim Plummer says:
May 23, 2015 at 3:07 pm

Thanks for the story. I admire your tenacity. You won! The Robin positively set up a troublesome to diagnose situation.

– Lisa Mackey says:
January 23, 2016 at 4:34 pm
OMG,, I’ve been having the identical bother after we just obtained 6 feet of snow! I’m lucky to be alive. Thanks all so much on your input on the internet to assist others! Saved making an attempt to light it now that u talked about the birds nest I realized it was the snow on the roof not permitting airflow, sadly earlier than studying this flames shot out in my face and almost blew me by the wall. GOD BLESS, & again, Thank you, Lisa

– Jim Plummer says:
January 23, 2016 at 4:47 pm

I am glad you are O.K. Good job of suspecting the snow was your downside.

Thanks for sharing your expertise.

35. dan says:
April 21, 2015 at 10:02 pm
Had the same problem myself and this fastened it. Thank you, thanks!

36. John says:
April 9, 2015 at 7:31 am
re-posting, because you deleted and didnt reply to my first inquiry. in some way, I suspect this will probably be handled the same…

I’ve an eight year previous Lennox G43UF-60D-135-06, new home installation. The diagnostic code on the management circuit is always the identical – Gradual Pink flashing LED mated with Quick Inexperienced Flashing LED (low flame sense detected). It started about a 12 months in the past, cleaned flame sensor – was high quality for three months. (which isn’t a straightforward activity on this model, given its mounting location inside the furnace) – flames inside the chamber seem regular, blue. About every other month, the flame sensor should be cleaned. Three different repair businesses have looked at my furnace – yet the issue stays unresolved. air intake has sturdy suction. no blocked exhaust. filter is changed on normal intervals. flame sensor isn’t unfastened and sits nicely adjusted in the flame. As of 3/30/15, the flame sensor has been cleaned three and changed 4 occasions. thanks! Gas furnace. for 7 years it was fine. unfinished. draws from internal room for combustion. Vent pipe from outside for recent air not blocked. Now it’s exhibiting the soiled flame sensor – “clean me” each other month. 2800 sqft, 9.5′ ceiling in basement. Additionally replaced: Circuit board ($400) and gas control module ($600). Then turned worse. (about as soon as a month the error code would return). Michigan home. Thoughts, feedback – a lot appreciated.

– Jim Plummer says:
Might 23, 2015 at 4:06 pm

I apologize for the delay. This would lead me to search for one thing that changed in your home on the time your problem began. I would like to know. Pool chemicals, cleaners, paint, scented candles and so forth… I would not have a straightforward solution for you. I wish I had one thing more definite for you. I hope this helps. You will have been thorough in following all possibilities as they have been posited to you. The mystery to solve is – what modified? Something changed after 7 years of trouble free operation. I could be particularly suspicious of anything that changed the composition of the combustion air. Please let me know what the issue is when you find it. ; anything that may produce fumes that may very well be sucked into the combustion air. I believe the issue is external to the furnace and can appear to be totally unrelated. It seems out of your narrative that cleansing the sensor corrects the problem when it happens. As you might be painfully aware, your malfunction goes to be one thing out of the unusual.

37. Jeremiah says:
March 23, 2015 at 2:Forty four pm
I have a lennox furnace. The ignitor re-lights and the flame kicks on once more. The ignitor lights up again however, the burners won’t re-mild. Then, the flame shuts down again after about a minute. If I shut the thermostat off for about 15 minutes, I can then get the burners to mild up once more but, the identical factor occurs where the burners turn off and on. The furnace burners kick on and run for a pair minutes and then shut down. Thanks. I cleaned the flame sensor however, the identical thing occurs, again.

38. Susie q says:
March 19, 2015 at 12:23 pm
I can let you know the associated fee… But I’m a single woman and afraid of gas, so I’m just blissful it’s working now. I have the identical contract but a unique serviceman and that is what he charged. 104 to scrub and warranty it for a year. The last time I will need to have had a random acts of kindness vibe going bc the man cleaned it for free as a part of my upkeep contract.

39. Steve says:
February 23, 2015 at 8:Forty pm
I reside in western Massachusetts and tonight the skin temperature is anticipated to drop to -14 levels Fahrenheit (Yes, that’s damaging or Under ZERO)! My gas furnace was cycling on and off repeatedly and so I turned to Internet looking and got here across your site.

The fix in this publish did the trick. It fired up and has been running wonderful for over an hour. I cleaned the sensor with high quality sandpaper, put it back together and turned the unit back on.

Thanks very a lot!

– Jim Plummer says:
February 24, 2015 at 11:39 am
Wow – That’s brutal weather. I’m happy we might assist in time.

40. JRigs says:
February 11, 2015 at 2:50 pm
Had this downside, dusted my sensors with some brillo and tissue (to take away dust). Fastened! THANKS!

– Jim Plummer says:
February 24, 2015 at 11:37 am
Glad we might help.

41. Heather says:
February 3, 2015 at 11:07 pm
I have to wash my flame senser about once a month or my furnace stops working. Might this be my drawback? I used to be informed by a good friend who does heating and plumbing that I most likely have a crack in my heat exchanger and my complete (14year outdated) furnace must be replaced. At present I observed that the exhaust pipe that runs from the water heater and connects to the exhaust pipe of the furnace before going up the chimney, is split open along the top side. We have now two co detectors within the basement by the furnace and more on our upper levels which have not detected any problems. I taped it closed for now with aluminum tape and my furnace appears to be running high-quality proper now.

– Jim Plummer says:
February 24, 2015 at 12:17 pm

Good job spotting the split in the pipe! I like to recommend changing the defective exhaust pipe and making sure there are not any different leaks within the exhaust pipe. Sure, this might be what is inflicting your downside. I have been pleasantly stunned how usually this follow leads to seemingly unrelated problems going away. I always suggest fixing the obvious downside first.


42. Gilbert Anguiano says:
February 2, 2015 at 10:27 pm
Thanks for the information on this web page trigger it was very helpful my furnace is now heating

43. Blake says:
January 14, 2015 at 7:07 pm
Thanks! Cleaned the fireplace rod with steel wool and the furnace is working great. I can solely imagine what a HVAC firm would charge! Due to tips like these, Ive been capable of restore all of my HVAC issues for a complete of 30 dollars.

44. maria graham says:
January 7, 2015 at 11:02 am

My furnace will simply cease working. I did exchange the thermostat thinking that was bad. The thermostat if set at sixty nine and the inside temp is 60 and it exhibits the unit is heating. The one technique to get heat is to turn off unit and restart it. Sadly it has not stopped the problem.

I have been studying about this drawback and so they state I want to clean the flame sensor which has not been cleaned in a while. Do I must take that out of the
furnace. Or might this problem be in a board?

Thanks, Maria

45. jp says:
December 29, 2014 at 7:Thirteen pm
Hi, my suburban sf35 blower runs non stop. Limit change was replaced after 2 weeks of bypassing (when furnace worked high-quality whereas waiting on part). It’s warm in here but the blower constant running is driving me loopy. Now the burner appears to hearth for a couple of min however never appears to catch.

46. Rene Flores says:
December 25, 2014 at 11:17 am
Hello my name rene I’m having issues with furnace it retains brief cycling ; I’ve changed smartvalue ,management board,high temp restrict, and rollout limit any help wuld be much appricated thanks

Helmet47. Cory says:
December 24, 2014 at 2:31 pm
I have been having points with my furnace. Am I not cleansing it good enough? Let me know what you suppose and thanks in your assist. The flame lights them goes out right away. I have cleaned the flame sensor several times and it really works for a number of days after which I must do it once more. May their be another subject? Do I want to buy a new sensor?


48. will says:
November 23, 2014 at 7:48 pm
Hey I have a Colman evcon gas furnace ive checked every little thing it had a bad high limit it was a one hundred fifty I modified it and now the flame and blower shuts off after 3 or four min and relights in just a few min then blower restarts and repeats ought to I have an even bigger high restrict or what I respect your assist

– Jim Plummer says:
December 4, 2014 at 6:03 pm

First, I like to recommend verifying that high restrict you changed is the part chopping the ability to gas valve in your Coleman Evcon gas furnace. This may be executed using a multi-meter.

Second, If the new excessive restrict is chopping the facility and it matches the temperature of the old excessive restrict I do not recommend putting in a better temperature. A faulty induced draft motor, a restriction in the exhaust pipe or inadequate make up air are places to look. The excessive restrict only cuts out when one thing else is flawed. Search for something causing diminished air circulation by way of the combustion chamber.

A gap within the heat exchanger can also disturb the air move patterns causing the excessive limit to chop out. In the event you suspect a gap shut down your furnace instantly till you can test it. Call your nearest U-Repair-IT Equipment Elements store if you have any extra questions. That is an extremely dangerous condition as the gas furnace can leak carbon monoxide fuel into the living area of the home and poison the occupants.

– Chris M says:
January 1, 2015 at 8:Thirteen pm
I’ve the identical flame out problem as described above. Have cleaned the flame sensor, checked all the connections and made certain the bottom wire was safe. The issue still persists. The flame stops as soon as the primary blower comes on. What else can i do to diagnose this problem? The system then instantly recycles with the ignition cycle and so forth. A friend stated perhaps the controller board is unhealthy and must be changed. Wouldn’t there be different points if this was the case.

– Emmett says:
November 14, 2015 at 9:Sixteen pm
I’ve the exact same problem. Thank you! All the pieces works because it should till blower stars and burners stop instantly. Did you sole this drawback? Three flashes code seems.

49. keith says:
February 12, 2014 at 7:Forty pm
I clean flame sensor it still brief cycle may it be pressure switch

– Jim Plummer says:
February 13, 2014 at 10:Forty four am
In most techniques a stress switch failure will prevent flame ignition. The pathway for low voltage electricity runs from the control board to the sensor by the flame to the burner again to the control by the use of the ground for the management board. Here are three more gadgets to examine. (2)Check the sensor is positioned within the flame. (3)Test the ground for the control board. If these three steps do not identify the issue, bring the wiring diagram for the furnace to U-Fix-IT and we’ll help you work out a plan for locating the problem. (1)Test for a superb connection between the flame sensor and the control.

50. Kirby Martin says:
December 22, 2013 at 4:09 pm
I have a BRyant eighty series heater (HVAC)system. Im considering taking thesensor out and cleansing it once more. I cleaned the sensor (maybe not good enough?) however the problem
persists. Cept now the flame will stay on for about 1 or 2 minutes, some
time possibly up to 5 minutes. however it would flame out quickly. I am very interested as to what this problem is trigger I am having the same problem. However that is Sunday, I feel they shut on Sundays… I now have some 4000 grit sandpaper,
possibly that will do the job? Will the folling answers be despatched to me or do Need to
come back and check a couple of occasions each day?
The guys at my U-Repair-It had realy nice guys to deal with. Mine has Puron for the AC. . Kirby


– Jim Plummer says:
December 23, 2013 at 10:17 am
Sure, cleaning it once more is a good idea. Please name back to the shop for those who proceed to have problems. Thank you in your inquiry. You are proper, U-Fix-It’s closed on Sundays to attend church and be with family. As well as, you could want to inspect the situation of the ceramic insulator and the wire connected to the sensor for cracks or breaks. It does not take a lot effort to wash the sensor for the reason that coating could be very skinny and simple to remove. The circuit for the sensor is accomplished by way of the furnace frame and the bottom for the board. Verify to make sure the electronic control board has an excellent ground.

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