Fan Does Not Work In "auto" Mode On My Lennox Pulse 21 Gas Furnace - HVAC - DIY Chatroom Home Improvement Forum

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Old 01-22-2009, 08:09 AM   #1
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fan does not work in "auto" mode on my Lennox Pulse 21 gas furnace

My Lennox Pulse21 has worked fine for the last several years, then I removed the thermostat to paint the walls (just the module; didnt disonnect the wires) and it was off the wall for about 2-3 months. Once I put it back on, the fan would never turn on in "auto" mode. It only works in the "on" mode. I tried a new thermostat and it did the same thing so I put the old one back on.

To run the heater I first turn on the heat, then the fan. Once the house gets to the proper temperature, I then turn the heat switch to "off" and the fan switch off, or actually "auto" mode until it gets cold in the house where then I repeat the process.

Can anyone help me or possibly point me in the right direction?
Thank you!


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Old 01-22-2009, 08:54 AM   #2
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That furnace has a nasty timed on circuit board to start the fan with the burner and it may be faulty. May be a coincidence that it failed now. It is very expensive/almost obsolete and a difficult/ not DIY/ retrofit/project. Call an EXPERIENCED Lennox Pulse tech.


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