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Phil, Mechanical Engineer
Category: HVAC
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Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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2 ton heat pump. In cooling mode suction pressure and head

Customer Question

2 ton heat pump. In cooling mode suction pressure and head pressure ok. unit worked properly. In heat mode, suction line and liquid line pressures equal 150 psi. true suction goes to vacuum. the outside unit shuts down from pressure switch. Any thoughts?
Submitted: 11 months ago.
Category: HVAC
Expert:  airheatman replied 11 months ago.

Most likely cause is a failed txv in outdoor unit.

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