Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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With my thermostat on auto and on heat, and the furnace turns on, the fan will not turn on with it. If I switch the fan to on it will run after I repeat back and forth from auto to fan on several times with it working on the fan on position( may take several switches). Is there a miscommunication from the thermostat or is there a short of some sort in my fan not getting the message from my furnace?

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Well, here is the deal: unless you rewired from two wire to multiple (usually 4 to 10 wires) wires, the fan cannot be controlled from the thermostat, even though the thermostat indicates that it can > it is a physical wiring and fan administration issue.

Unless you have a newer furnace, the fan is controlled by plenum temp. Works like this: burner turns on, no fan until the plenum temp reaches set temp,....then burner off, and fan keeps running until pelnum temp drops, and often the fan may kick on a few more times as this temp depletes.

Posted on Oct 03, 2010

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