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Blower Motor cycles on & off

Burner ignites fine but the blower motor will not stay on. It blows hot air for about 10 seconds and shuts down for about 30 seconds and will continue this cycling, meanwhile the burner is staying lit.

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Whats happening is thje heat exchanger is cooling off and cycling the fan off this is a normal occurance whenever the unit is first turned on.

Posted on Dec 22, 2008

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Replaced ignator and flame sensor. Heater comes on normally but flame only stays on for 10 to 15 seconds. Faullt blinks 3 times. It will blink 3 times for about 30 seconds. Then re-cycles again.


Sounds like your you may have a dirty pilot assembly if your unit is a direct spark system. Also check ground wires are secure.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jerry_8a145f1328fa119f

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The whole assembly must be replaced.

The sequence of operation is -

Combustion fan purges the heat exchanger. A pressure switch verifies combustion air fan is running. Usually a 30-45 second purge before the hot surface ignitor glows, or the spark ignition starts.

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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).

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