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My furnace will not stay lit. It lights for about 5 seconds and then goes off. It does that about three times...Ita winter...haha burrrr

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Um auto pilot or u have to light the pilot i do not know what you are asking btw if it is just not running long enough time for new theremostat

Posted on Dec 02, 2008

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LIght on box inside flashes 4 times on a new propane fill up


If the gas was empty for three days, the furnace may have attempted to start numerous times causing virtually ALL residual gas in the incoming line to be drawn out. You may consider purging the gas line at the clean out cap where the gas line enters the furnace. However, it should have restarted and stayed running after just a few times at the most because as long as the line was NOT disconnected from the main tank, there should be NO air inside the line to cause flame failure.

I'd suggest asking the service company to double check the furnace manifold pressure to ensure there is not a regulator related problem.

Three times this winter (on the coldest days no less) a tiny droplet of water froze internally of the regulator right on the orifice blocking gas flow.

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Furnace won't stay lit. Intertherm Model M2RC-080A-16BN. Ignightor glows, flame starts and after a few seconds the flame shuts off. Then it starts the cycle again. It goes thru this cycle a fe


It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.

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1 Answer

Rheem furnace problem wont stay lit


You need to see what it does. Does it light at all? will the pilot stay on? If lights but wont let you release the knob then thermocouple is bad. I
If it is electric start then watch the series of events. enducer fan motor starts, element heats up, gas lights but shuts off after 1 second. 5 seconds 1 minute and so on. Also your computer board on the furnace will flash a code indicating a problem. count the flashes and read the panel on the furnace for help it should give a description of the the errors.
all depends on the age and type of unit. respond if you have more questions .

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I have a goodman propane furnace, model # GMPN080-4 that lights for about five seconds and then cuts off. It does this three times and then stops all together. Tried lightly sanding the flame sensor and it...


The goodman furnace will try and light three time before it faults out for safety reasons. Adjust the flame sensor so that it is closer to the flame or actually in the pilot flame. If the flame sensor is inside the pilot flame and still does not stay lit, your flame sensor is probably defective and should be replaced. You can get one at Ferguson's counter sales.

Dec 12, 2010 | Air Conditioners

1 Answer

The pilot light will stay lit. Go to turn on heater and stays on briefly and goes out The heater wont stay lit.


If the fan comes on and blows out the pilot light then you need a new furnace because that's the sign of a crack in the heat exchanger. Need a little better description. Do the burners light then the fan come`s on and then it goes out completely?

Nov 24, 2010 | Air Conditioners

1 Answer

Air pro gas furnace model #g8c07512mub11a The combustion fan comes on the igniter glows red the gas fires in the burners for 5 seconds the it shuts down. Any suggestions would be helpful.


I would suggest you change the flame sensor. It will be a small diameter probe extending into burner compartment,usually over or inbetween burners. If your furnace is lighting the burners but they won't stay lit That Is what I would do first.. I also would turn thermostat to fan on to make sure you don't have a problem with the fan. Hope this helps you. Thanks

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2 Answers

Flame sensor dirty


Sandpaper lightly scrubbed over the sensor tip to remove any contamination.

Sometimes cleaning is not enough and the sensor must be replaced.

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sounds like you have bad flame sensor or the sensor is in a bad postition. To get eliminate the lockout turn the power off to the unit and back on again. Look at the circuit board light and see what the troubleshooting code is.

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1 Answer

The furnace burners won't stay lit


Could be a couple things. First and easiest is to check your intake combustion air supply. If it is blocked by anything or just not enough flow, it will put out the flame. Next would be the flame sensor, usually a temperature probe near the flame front. If it's not reading an increase in temp within a pre-programmed time, it will kill the flame. It can be checked with a multimeter.

Good luck!

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