Sounds like a problem with the reversing valve. I had a two y/o heatpump system have a reversing valve fail. The entire valve assy had to be replaced. This is NOT a DIY job. You have to recapture the refrigerant and then unsolder the reversing valve and resolder a new one in and test for leaks and purge the air from the lines before recharging the system. Really NOT a DIY job...
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Sounds like a problem with the reversing valve. I had a two y/o heatpump system have a reversing valve fail. The entire valve assy had to be replaced. This is NOT a DIY job. You have to recapture the refrigerant and then unsolder the reversing valve and resolder a new one in and test for leaks and purge the air from the lines before recharging the system. Really NOT a DIY job...