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I don't normally do much with heat pump service but a friend of mine asked if I'd take a look at his. So I did :( and here's the deal. I think the reversing valve is not functioning based on the following observations.
Thermostat is set to cooling and is wired correctly. The incoming water is warmer than the discharge water. Compressor is running and pulls nominal amperage. The unit is blowing hot air into the house. The coil on the reversing valve is powered and magnetized.
So, is there a possibility that the coil is bad or is he reversing valve stuck and how would I tell?