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Heat pump a/c comes onwhen you push the contactor but not when its just in cooling mode

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Re: heat pump

Check at the outdoor unit where your electric and your refrigerant copper lines come in to the back of the unit and look for a little round red reset button. Push it, the unit might then come on.

Posted on Dec 09, 2007

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Re: heat pump

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Why contactor on heat pump will not energize heat mode?

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does this unit have a capacitor that is hooked up to the motor, as it may be the capacitor or motor, of course this is just a guess as I am not there to see it. I guess you can push in the contactor a few times and make sure all is coming on like it should, might be the control board. Just a matter of pluck and chuck. Good Luck Tim

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Because the outdoor unit works in cooling, it sounds as though the contactor and other components outside are working correctly. The problem sounds as though it might be somewhere in your thermostat. Has the thermostat been replaced recently? If so, make sure it was wired correctly. If not, check all of the connections and contact points in your thermostat. In order for your outdoor unit to run, you must have 24vac at your "C" Common and "Y" connections. You must have this in COOL mode. Now it has to be determined why you don't have it in HEAT mode. Definitely a thermostat issue.

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2 Answers

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With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
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