Quick Navigation AOP Residential HVAC Top The lennox g20 is spark ignition!!!!!!!! If however the flame sensor is bad it will continue to click until the module cycles off.Īnyway you can either replace the Flame Sensor or the entire ignition system that includes the sensor as suggested by pipedope and energy-wise on previous posts. The Flame sensor recognizes that a flame is present and sends a signal back to the Ignition module and the audio clicking stops. The gas valve opens which releases the gas over the HSI and your furnace ignites. The Ignition Module sends 120V to the HSI. If upon visual inspection you find that the HSI glows, the gas ignites (meaning the heater comes on temporally) then cycles off and you continue to hear a clicking sound.

I have to reset the system to start again, eventually it will light.” Sometimes it just sits and clicks, then shuts off.

I've traced it back to the ignition system not lighting.

“For the past few weeks I've noticed that my heating system doesn't turn on. Our 20th year anniversary is May 21, 2020. If you have any problems with the registration process or your account login, please contact support. We suggest not registering using an AT&T, BellSouth, AOL or Yahoo email address.

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G20 lennox furnace parts