No Power To Rc Wire Detected Nest - A nest e24 error means ‘no power to the rh wire has been detected’. Such an indication will appear when the heating system or the actual thermostat is not receiving power. In some cases, the thermostat may display an error message indicating that there is no power to the rc wire. This error message can be caused by a number of different issues,. The e73 error on your nest thermostat indicates that there is no power detected to the rc wire. My north system suddenly started reporting no power on rc wire. I tested the red rc wire to the blue common wire and there. Look and see if maybe there is a float switch in drain and if so lift the float to see if we get power to the nest. I don’t see a float switch. It would be in the main drain line or an overflow pan under. The nest error e73 is a common problem caused by no power supply to the rc wire. This occurs mainly due to extremely hot temperatures, burnt fuse, low voltage to the rc wire,. Try running your old thermostat with the batteries removed. If it doesn't power on, your c wire isn't connected at the air handler. Did you ever find out the problem?
A nest e24 error means ‘no power to the rh wire has been detected’. Such an indication will appear when the heating system or the actual thermostat is not receiving power. In some cases, the thermostat may display an error message indicating that there is no power to the rc wire. This error message can be caused by a number of different issues,. The e73 error on your nest thermostat indicates that there is no power detected to the rc wire.