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The burners go out before the fan comes on

The glow plug gets yellow hot and the 3 burners ignite but before the fan comes on the burners go out after about 10 seconds and the furnace repeats the cycle.

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Replace your flame sensor, but before you do that, see if you can clean it with light wool, or emery cloth, or light sand paper. It's a metal rod that points in the current of your flame.

Posted on Dec 06, 2008

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Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Heating & Cooling

1 Answer

I have a carrier 58sx040. Sometimes after the pilot comes on the main flame will start then stop about every 3 seconds. This problem intermittent. There is always a noise coming from the gas inlet when...


Dirty flame rod, polish it with a scrub pad.

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 13, 2010 | Carrier 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

1 Answer

Furnace restart


What kind of ignition is it? If it is a Hot surface igniter(glow coil) look for a small, maybe 3-4 inch long rod that is mounted to or near the burner. It's probably on the burner on the side away from the igniter and would be in the flame when the burner comes on. Clean it with sand paper. It's a flame sensor and the igniter is sending a small amount of voltage through the flame(fire is a conductor) to the sensor and if it's dirty it won't complete the circuit. If after cleaning it works then great you need to get a new one within a few days. If it doesn't work then the igniter is probably weak and needs replacing but it could be something else so I would call for service instead of guessing.

Jan 17, 2009 | Heating & Cooling

1 Answer

Rheem gas furnace pilot lights, but no burners or fan


If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Jan 06, 2009 | Heating & Cooling

1 Answer

The burners go out before the fan starts


Replace the flame sensor, clean the burners to ensure you have a good clean burn pattern and the flame is properly reaching the flame sensor.

Look for a flashing LED and determine what the failure code is.

Dec 05, 2008 | Heating & Cooling

1 Answer

Burners go out before the fan starts


that makes no sense? the door on does exactly the same thing as you holding the switch closed and neither has anything to do with the problem you are describing. if door were off nothing would happen. if door was on ,nothing would happen unless the switch was closed. it may be coincidence, but sounds like the unit is not proofing the flame. look for a little needle like sensor that protrudes into the flame path in front of a burner. when the burners light it senses flame and tells gas valve burners lit and its ok to stay on. then heat builds and the fan is briught on. once in a blue moon the overtemp sensor trips open prematurely as soon as the burners start to heat up. it is a little wire in , wire out sensor above the burners that protreudes into the bulkhead above the burners. if it is cold and open its bad. if you jump it and burners light and stay lit and fan comes on its bad. fairly cheap and easy to replace. you may have an old fan limit switch the rotates like a spring to bring the fan on as it heats up, then turns off burner if its gets to hot or is set to low. it also turns fan of as burners cool down.

Dec 05, 2008 | Heating & Cooling

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