Okay, I replaced the control board to no avail. I checked the 24v transformer, it is reading 31v. I manually tripped the contactor on the heat pump, it kicked on. I have tried bypassing the thermostat (green/red white/red yellow/red) no go there either. What's left? I still have zero control via the...

I'm guessing that wasn't meant to go in this thread?

This system has worked well enough for a few years, and I was cutting on the system as it was starting to get warm out. It ran fine, but then I am guessing it got cool one night and I got some ice on it. I cut it off and thawed it out. It ran fine for a few weeks after that, then all at once stopped...