I have a water-source heat pump (ClimateMaster Genesis) in a high-rise condo building that's been giving me trouble for years now. It periodically fails in heating mode. The first diagnosis was a bad thermostat, after which it heated normally for several months, only to fail again. Next diagnosis was a bad TXV. Brought in a second company for another estimate, and the second company said the TXV was fine, the unit just needed refrigerant. It then worked for about 6 weeks before failing again. Third diagnosis is that the coil is leaking refrigerant.
None of the theories make sense to me because, throughout all of this (over 2+ years), the heat pump works fine in cooling mode. In heating mode, the compressor cycles off after a minute or so, producing no hot air, while in cooling mode the compressor stays on and after being on for a while cools the air 10-15 degrees.
Any help troubleshooting would be appreciated.