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When standing pilot is lit with a call for heat gas is released for a couple seconds before it ignights and it backfires hitting the limit swith and pilot goes out. I have cleaned burners and pilot . Ive checked gas presure. what could be causeing that.

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  • Ken Bledsoe May 11, 2010

    Is the unit more then 10 years old? And what brand is it.

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Improper airflow.
Check to see that there are no obstructions in the exhaust flue.
Make sure the inducer fan is operating and the blades are intact. (if your unit is equipped with a draft inducer motor.)

Flame rollout can also be cause by cracked heat exchangers when the blower kicks on, or from wind blowing into the flu in reverse.

(Bad/missing wind deflector outside on top of flue, or unusually gusty wind in unusual angles.)

Posted on Dec 13, 2008

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if it stays lit then the thermal couple is good
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Rheem rp4036m


Under the gas valve is a removable panel. On models of that era there should also be a second panel behind the first. remove both.

the pilot light should be clearly visible.

If no pilot, turn the gas valve to OFF. wait 60 seconds. locate the tubes from the gas valve to the pilot location. turn the valve to pilot, and with a long match or grill lighter lit, place flame at the pilot location and press down on the pilot button beside the main valve.

pilot should light. If not shut off the gas and call a technician. If yes, hold the pilot button for 60 seconds, then slowly release. Pilot should stay lit. If not, shut off gas and replace thermocouple, start relight sequence over. If pilot stays lit, replace inner cover and adjust temp to 120 deg. If heater fires up, replace outer cover. Done.

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pilot light keeps going out! more then likely its the thermal coupling doing this. if bad it shut all gas to heater for a safety measure. just shut power off, then turn gas off and replace it. then you should be ready to go. to relight heater hold down on gas vavle knob in the pilot position, hold down and light it at the coupling where gas comes out. when it is lit, continue to hold down for 60 seconds. release knob very slow. then if its lit, turn to the run position. if flme goes out, wait at least 5 minutes to expel the gas fumes and turn to pilot and try again. good-day !

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hey Carli suspect you mean the pilot goes out as soon as u turn your gas control valve back to the on position!? If this is so, you will have to probable reset the flue spill switch located right at the exaust outlet. OR, SOMETIMES THEY HAVE ANOTHER LIMIT switch in the same circuit in series. If the pilot goes out when u release the pilot press down knob, then it is your thermo couple is loose or fininshed,or the pilot flame is not aimed properly at the sensor (thermo couple)

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The thermal couple that senses the heat from the pilot and holds the gas valve in the ready condition must be bad. It is not difficult to replace. Note: When you first lite the pilot flame you must hold the button down for at least 30 seconds before releasing it. Also check the size of the pilot flame that contacts the thermocouple.

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