Question about Heating & Cooling
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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Posted on Jan 02, 2017
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