SOURCE: Fan Honeywell Chronotherm IV T8600
sounds like the fan has been programmed to come on during that time. run through your programming settings and make sure the fan is set to auto for all the times.
SOURCE: I have a Honeywell Hy108
possible bad motor or bad capacitor try spinning fan by hand if fan runs change capacitor if it dont come on check voltage to fan if voltage is present change fan motor.
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