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did you program the thermostat for heat pump?
R is 24v and O is reverse valve...but we still need the compressor to kick on which is Y.
depends...did you program the thermostat for heat pump operation?
I understand....but...in the thermostat menu....did you set the thermostat for heat pump? It comes shipped for gas furnace and must be changed..what is thermostat make/model
start at page 13 HERE
function 1 must be set for your heat pump system
that will be 5.
also if the outdoor unit is a rheem the changeover valve is B.
If NOT a Rheem or Ruud it is set for O
just respond or rate when ready