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Thanks Labman,

According to the instructions:
RH, R, VR, or 4= RH 24 Volt
RC, VC= RC 24 Volt
G, F = Fan
Y/O = the reversing valve operation in cool mode
W/B = the reversing valve operating...

I just moved into a new house, well new to me. It has a heat pump system. I'm not familiar with them at all and need some help. I took out my old mechanical thermostat and replaced it with a...