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The blower doesn't start on
My furnace Lennox G20Q3/4E-100-5 behaves as follows:
1) Fan is on "Auto" 2) Thermostat calls for heat 3) Flame occurs 4) Blower doesn't come "On". After a while, the burner stops due to safety. It retries again, and same thing happens. 5) When the burner is "On", I put the blower on "Fan On" mode and the furnace keeps running until it meets the thermostat set-point. Then the burner goes "Off". Blower keeps running, because it's on "Fan On" forced mode. I see where someone had same problem just need to know where can I purchase the controller board or even the relays for the board would be even better. My location Toronto Canada. |
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You have a fan control problem in the auto mode.
Here is your service manual. Looks like it is a board problem. http://0190acd.netsolhost.com/manuals/G20_Series.pdf |
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I figured it was the controller board I'm trying to find similar boards (defective) that I could scavenge some parts such as a relay to see if that resolve the issue. The furnace did this once before but started working again after I had set the thermostat to a much higher temperature. |
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