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Just noticed this error which aparently started 3 days ago. I have AC and heat on this gen 3 thermostat. Heat has W1 and Rh wires inserted and I tested voltage and see about 28 volts. AC wires are Y1 G and Rc. Tested the voltage on Rc and see about 27 volts. I swapped thermostat with another one and see same error, so it would appear to be issue other then thermostat, but not sure what to tell HVAC guy (which is a huge fan of them in the first place)
Any thoughts would be appreciated.
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