Heat Pump Contactor Not Pulling In


Old 08-02-14, 10:45 AM
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Heat Pump Contactor Not Pulling In

The inside air handler comes on when the thermostat calls for COOL but the outside unit not starting. I can actually hear and see the contactor try to pull in but not pulling in. If I manually push in the contactor everything works fine fan turns and compressor comes on but if I release it stops working. I have my HVAC EPA license and work for an apartment complex, just need a little advice of whats causing this? I am thinking that it may be the transformer in the air handler not working properly.
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Old 08-02-14, 01:07 PM
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Put your meter on the contactor coil. If you have 24V, then the contactor is bad. If 0 volts, check from R to C and Y to C in the furnace.
Old 08-11-14, 07:21 AM
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If you check for 24 volts and your voltage disappears you have a bad connection in a wire nut or bad t-stat wire
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