My power control board inside my furnace seems to be broken and a service technician cannot come out until after the memorial day weekend. My thermostat is not receiving power. Using a multimeter I see only 25 VAC between the common and the W2 wire. Everything else is zero or near zero. Using the fact that 25 V is present on the wire connectors, is there a way to manually start and stop my heat pump until the service technician is able to visit?
My research shows that the white wire is for heating and the red orange and yellow wires are what is necessary to operate the AC. The blower within the furnace is also continually running so there should not be an issue with it freezing over.
My thinking was that I could disconnect the white wire from the cable that runs from the furnace to the AC unit and connect the R, O, and Y together, and connect them to the hot spot (W) on the control board. This would put 25 V on those three wires and return through the common which is still connected on the other end. Will this work? Or is there a better way to accomplish this?