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Lennox G26Q3-75-3 Heating issue: Furnaces runs through start up cycle, blower motor, ignition, nice blue flame in heat tubes, then the flames go out. (see optional details)

This is an intermittent problem that just started in the past few days. LED 1& 2 Slow flash. Not sure if its a wirig issue due to the intermittent nature of the fault or is it something (gas valve / flame sensor ) about to fail completely..

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Try cleaning the flame sensor.

Posted on Dec 08, 2016

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1 Answer

Lennox G20 gas valve switches off then on Intermittently?


This could be a dirty flane sencor of the pressure switch check hoses are tight and not spilt , try jumping out the pressure switch see if that makes it work also check air fliter is clean .

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Replaced igniter, dryer worked great for 3 days, now igniter still works but the flame only stays on for 3 to 4 seconds not raelly heating up the dryer


it can be the high limit thermostat,the flame sensor eye on the burner tube,or the cycling thermostat on the blower housing you can try bypassing the thermostats to see if they are weak,but dont leave them bypassed as they control heat output and will cause over heating if left bypassed

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Pilot lights up but would not fire up into heating, I have brivis buffalo 85


This is the proper cycle of a furnace and what should happen.

Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

If the pilot turns on and the gas ignites, then shortly after the unit shuts off, chances are this is your blower motor. It is not starting up, then the heat limit is reached in your unit and the safety shuts it off.

Mar 02, 2011 | Honeywell Programmable Thermostat Heater

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Furnace motor turns on, igniter lights gas and as soon as the blower turns on the gas shuts off. It will cycle like this for 2-3 times then seems to operate normally.


Sounds like the unit is triping the limit before the blower comes on. Try puting the fan ON at the thermostat and see how the burners react with a heating call. If they stay on then I would look at the wiring diagram and try and determine what turns the blower on it the heat cycle. is it temperature or time delay through a control board. Hope this helps.

Jan 21, 2011 | Heating & Cooling

1 Answer

My furnace will not shut off on auto. the fan will not run when switched to on. what should I check?


Some new furnaces have a feature that when it has an issue, it starts the room air blower until you reset the thermostat or kill power to the furnace. Not knowing what you have for a system I can offer you only how a furnace works and what you could look for "generically".

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).

Jan 18, 2010 | Honeywell Heating & Cooling

1 Answer

Lennox diplomat furnace will not always ignite. I have cleaned the heat sensor and ignitor. Could ignitor be going?


Maybe, look for bad wiring connections and retighten the ground wires from circuit board to cabinet. Take a can of air and clean the burner tubes being careful not to blow on the igniter. Are ther any error codes blinking when it does not light? Read on for some more tips.

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).

Dec 29, 2009 | Heating & Cooling

3 Answers

My Colman forced air heater is cycling acording to the thrmastat but wont heat up. The trouble shooting light flashes three times.What part do you think is failing?


3 flashes is the combustion pressure switch . Mounted on the front mid high. Two silicone hoses run to it along with blue two wires. By now you have probaly got this fixed though.

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Dryer heating problem


It sounds like an air flow issue. There is a flame sensor on the side of the flame housing. If the venting is not sucking the flame down the tube it will cycle very quickly and never reach the right temp.

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