Chronotherm III the fan will not shurt

I have two units, both the same kind. The main one when turned on, the fan will not turn off. i see the temps and can adjust them, but I can not get fan off

Reply to
Johnnie Chesser
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Does it respond to the separate fan switch on the thermostat? There are basically a few possibilities:

Stuck relay or similar failure on the thermostat Stuck relay or similar failure in the furnace If it's an older furnace with a fan temp switch, that could be set wrong or bad Wiring short on the fan wire, but that would have the fan on all the time independent of the thermostat.

Reply to
trader_4

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