No Pressure Differential

Gibson single speed 13 seer

In heat pump mode pressures are the same. Compressor will pump down.... thinking bad reversing valve?

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Oct 23, 2014
3rd Port
by: Ex-HVAC Instructor

Were you using the 3rd port to check suction pressure? In the heat mode, both refrigerant lines are high pressure. When heating, the large line is the hot high pressure gas line and the small line is always the high pressure liquid line.

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