need help air handler shutting off but condenser not

Old 06-20-14, 11:03 AM
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need help air handler shutting off but condenser not

Hi, ok when my thermostat reaches temperature the air handler shuts off but the straight cool condenser outside does not. I removed the 24v wire from the compressor contactor and it shut off. i believe whatever is sending 24v to the contactor is malfunctioning. please help.
Old 06-20-14, 11:28 AM
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It sounds like your thermostat is bad, or your thermostat wiring is shorted. Most thermostats use relays to control the functions (cool, heat, air handler). It sounds like the relay that controls cooling (outside unit) is stuck in the "ON" position. A simple test would be to unplug the thermostat from the mounting plate. If the compressor turns off, the wiring isn't shorted, pointing to a defective thermostat.

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