a/c wont turn off

will smith_4

Could either be a relay at the furnace stuck closed and passing power to the condenser, or the contactor at the condenser could be stuck closed.
Good luck-

greg_29

a/c wont turn off

hello
first timer here hoping to get some help
my a/c will not turn off
i checked the wires at the t-stat--furnace and outside unit
24v
when i switch off at the t-stat outside unit keeps running
furnace turns off
i think it is a bad t-stat but want another opinon before i continue
thank you for your help

Eugene Silberstein

Sounds like

Since the blower in the furnace turns off when the unit is shut down, the fan relay is operating.

If you want to check the thermostat, the easiest away to do this is to remove the thermostat from the subbase and disconnect the "Y" wire. Check the outdoor unit. If the unit is still operating, the thermostat is fine and the contactor contacts are stuck in the closed position. If the outdoor unit is not operating, chances are that you have a defective thermostat.

Keep us posted.