Heat Pump Troubleshoot

Heat pump stopped making heat (and AC) new thermostat did not solve problem. While trouble shooting the problem, testing various aspects of the system, it started to make heat (and AC). Suspected that the valve in the compressor that reverses the cycle from heat to cool may have been stuck and needed to be switched back and forth a few times. The system gets used about twice per year, so the moral of the story is run your system during the year to keep things from seizing up. $49 later I'm up and running again. I learned a lot about my system and avoided expensive repairs. The first two folks I called, immediately suggested replacing the system without looking at it.