Furnace Exhaust Fan Won T Shut Off

This is the way ours works with a atwood thermostat.

Furnace exhaust fan won t shut off.

Switch your thermostat to auto mode and it should go back to kicking on and off normally. Auto will shut off the fan low and high will not shut off the fan. These same diagnostics also aid in air conditioning blower assembly diagnosis when an a c blower continues running. Blower fan won t shut off.

If your thermostat s fan is set to on then this is likely your problem. These two settings are for continus fans no matter what. On the whole the temperature control switches cannot be adjusted and are to be changed if they are defective. This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so.

Blowr fan won t stop. If you can get into the control box look for a small relay follow the fan wires to the relay. Why does my furnace fan keep running. Your hvac fan should turn on and off with the rest of your heating and cooling system.

Furnace blower fan wont turn off fan select switch on the thermostat is in the manual on position a control wiring problem where the insulation on the wiring is worn off a bad relay fan sequencer relay fan limit control or circuit board with contacts sticking this depends on the type. It s contacts probably welded or burned closed. Make sure the white button is not pressed in your fan limit switch will have a small white button on the lower. The exhaust fan relay is hung up.

If you can use a screw driver and pop the contacts open. It s normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops but your fan shouldn t run for hours on its own. Check to make sure the limit and rollouts are all closed. Forced air heating or cooling air handler troubleshooting.

Locate your fan limit switch your fan limit switch is located inside the furnace panel cover usually near the. If that doesn t work another possible problem could be the limit switch for your blower but this would need to be serviced by an hvac technician.