When troubleshooting an air-to-air heat pump, the technician notices that warm air is coming out of the indoor coil during a call for cooling. What is the most likely problem?

Question

Quizplus · Accepted Answer

The issue described suggests a problem with either the room thermostat (A) or the reversing valve (B). A defective room thermostat might not be correctly signaling the heat pump to switch to cooling mode, while a defective reversing valve, which is responsible for changing the direction of refrigerant flow between heating and cooling modes, might be stuck in the heating position.

When Troubleshooting an Air-To-Air Heat Pump, the Technician Notices That