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The pilot light lights, exhaust fan runs, but burner will not light.

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There shoud be a switch associated to the exhaust blower to prove it's operation. Could be plugged, bad OR I have found varmits in either the intake or exhaust of the furnace PVC piping.

Posted on Oct 02, 2010

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I have a hanging Dayton in garage pilot lights fine furnace fires up runs 6or7 min. then burner and pilot go out


Does unit fan come on ??? Is flue clear as most units have a safety klixon if exhaust not venting properly.

Nov 24, 2012 | Dayton Gas Furnace Heater

1 Answer

Fan turns on, pilot on left side turns on red light at bottom stays solid during entire time then pilot goes out and blower stops no heat please help


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remaing solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Oct 05, 2010 | Goodman GMS90703BXA Heater

1 Answer

I have a Rheem Power Vent propane water heater model3 21VP4OE-1P that is acting up. The pilot lights and then the burner lights, but goes off after 5 - 10 seconds. It cycles like this 2 or 3 times, then...


check the thermal coupling for the pilot light. if it goes out it will shut down gas supply, its a safety feature to put out pilot light if the thermal coupling is bad. to prevent gas from leaking and causeing a fire. check coupling.

Aug 12, 2010 | Water Heaters

1 Answer

Burners not burning, pilot light is off. How do I start the pilot light?


There is no pilot on this unit. It is electronic ignition.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 29, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

William forshaire 435 runs well for awhile until


Try cleaning your thermocouple,and resetting it where was, which is located at the pilot flame. this should solve your problem.

Feb 23, 2010 | Heating & Cooling

1 Answer

Goodman unit. when i turn it on the blower fan and the exhaust fan comes on butit does not lite no flames at all. i don't even hear the gas click in.


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Feb 15, 2010 | Intertherm P3RA-048K Air Conditioner

1 Answer

Carrier furnace, pilot does not light, fans run for a couple minutes and then flashes code 31


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Nov 28, 2009 | Carrier 38CKC042 Air Conditioner

2 Answers

The exhaust blower starts for about 15 seconds then shuts off. several minutes later, the same thing happens - over and over


goodman furnance the exhaust fan starts, igniter glows hot, all burners lite up & will burn for about a minute and shuts down . I think it senses the room blower does not start so it shuts down.

Oct 20, 2009 | Ruud UBHC Air Conditioner

2 Answers

I have a Dayton gas heater Model 3E225


Does the main blower fan kick on? Also, if the heater is vented outside via a flue pipe, there may be a small (about 3 or 4 inches in diameter) vent fan that kicks on to ensure the exhaust fumes are evacuated through the flue pipe. If there's a problem with that fan, the burner won't light either.

Nov 20, 2008 | Dayton (3E379) Heater

2 Answers

New water heater problems


the switch is broken, or the voltage on the power from the wall is lower than the voltage on the tank and therefore it could only powering one thing

Oct 16, 2008 | Water Heaters

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