Question about Air Conditioners
95% chance that the heat relay is stuck closed (on)
You can disconnect power, locate the heat relay, see if you have continuity between the two leads on the load side of the relay. (with the two wires off)
If you do, the relay is stuck. Sometimes you can lightly tap the relay and it will unstick, but chances are it will just stick again soon.
If the relay is stuck/sticking, it needs to be replaced.
They usually run anywhere from 6 to 26 bucks at the local HVAC supply house.
Posted on Dec 06, 2008
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