Outside unit won't stay on


Old 02-16-14, 10:09 AM
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Outside unit won't stay on

Hello all... i'm having an issue with my heat pump. When i reset the system it will run perfectly for anywhere from minutes to hours, but then the outside unit just stops. The blower will then continue to run continuously until i turn the system off and on again at the thermostat. I had a serviceman out here and he said my defrost control board was bad, so i replaced it but i'm still having the same problem. My second guess is that the high pressure switch is tripping. And it would make sense based on what i found in the owners manual...

"The lock out control opens the circuits to the compressor contactor, stopping the compressor in response to the high pressure (#400) limit switch opening for more than one second. The compressor will remain off until the high pressure switch recloses. During the period the switch is open, the control will provide a pulsed output at the "X" terminal to indicate the lock-out condition. After the high pressure switch recloses, the compressor can restart after a 5 minute anti-short cycle period. If the unit experiences a second high pressure switch opening within a six hour period, the control will go into a lockout condition and will not allow the compressor to restart unless reset. To reset the lockout, turn the indoor thermostat's system switch to "OFF" then, back to the selected mode OR disconnect the power to the transformer for at least two seconds."

Any thought on how i test the pressure switch? Is the pusle at the "X" terminal something i can test for? Or am i completely off base here?

Thanks in advance!!
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Old 02-23-14, 10:53 AM
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Will resetting the stat restart your heat pump as stated in your manual?

Verify that all indoor supply registers are open and the air filter is clean.

Checking that the blower wheel and indoor coil is clean would also be a good idea.
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