heater fan on today the switch was set to AC
I came in from work today my heater fan was running, the fan was running outside thru the heater exchanger but it had no heat in it and the heater fan inside was blowing. my switch was set to AC, I we...
Forum Discussion
dougrainer wrote:Chris Bryant wrote:
The thermostat cannot control just the furnace blower- the fan auto/hi/low setting affects the air conditioner blower during furnace operation, but the OP has the furnace blower running.
It pretty much has to be the fan control board in the furnace- if the thermostat were calling for heat, the burner would come on as well as the blower, but blower only points to furnace board.
I had a similar problem. The Fan relay on the furnace board was stuck CLOSED(ON). IF this happens, since the tstat did not call for heat, the system does not try to ignite the burner. What we found was, there was water intrusion and the Circuit board had rusty corrosion. This jumped the Fan wires and ran the furnace motor. Doug
YEP........
Reading AND comprehending .......got FANS mixed up
