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Have Coleman-Evcon heat pump system. Model DRHS0421CB. Condensing unit has intermittent no run condition. I replaced the contactor, as it was a few years old. I eliminated the thermostat from the equation by twisting together the RYO wires at the thermostat sub panel. This makes the air handler run and MOST of the time also makes the condensing unit come on as well. When it does run together, it cools great. Suction and discharge pressures are normal. The float switch is ok and no water present in pan. But after about 10 minutes, the condensing unit cuts off (ie fan and compressor)with the air handler continuing to run. Upon inspection, I find that the contactor is not pulled in, due to the fact that the 24 volt supply has been lost somehow. I found a loose wire on the defrost timer board, which when jiggled, clicked a relay. I thought I had surely found the problem. The unit ran normally for 10 minutes then lost the 24v to the contactor again. Jiggling did not do the trick this time. When the contactor is pushed in manually, the comp/fan kicks on.

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Elimate the items not needed to test the unit.
Disconnect the defrost power board and set air handler to run.
Disconnect the thermostat and hold contactor switch in closeing connections to the compressor and condensor fan.
If the unit shuts down while these connections are closed, it could be one of two things.
First, do you have high and low pressure cutoffs..???
Second, Their is a thermo by-metal cut off at the base of the compressor. This unit will open circuit to keep compressor from over heating.
I would remove the board with loose connections and have it repaired.
Next, I would look at the board and see if relays are opening and closeing correctly.
Last of all, have you checked your pressure switches ?? High ab nd low side pressures ?
It looks like you know what you are doing, so give it a shut, but I had to ask. !

Get back to me and let me know what you have found.
Hope this has helped you.

Posted on Oct 05, 2009

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