Nest Thermostat Not Energizing Reversing Valve
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If the unit is stuck in heat mode with the reversing valve confirmed energized and compressor running and you cannot get it to switch modes, the valve has failed. If everything behaves when you jump out the thermostat wires as described above but stops working when the nest is reinstalled, the nest has failed. The reversing valve is energized for cool mode, de energized during heat pump mode operation. Voltages is ~24v ac.
There should be no voltage at the o/b terminal with no call for heat or cool. If your google nest thermostat won't turn on and there's a blinking red or green light, or no light at all, there could be a power issue or your thermostat may have frozen during a software update. Follow the troubleshooting steps below that match the issue you're seeing. Why is my nest thermostat not working? If your nest won't turn on, most probably it's a power issue and most likely the battery has run out of juice. Hydraulic valves are an important piece of any hydraulic system. If you need directional flow control, pressure control, flow control, we can get the best hydraulic valves used today and they will meet all requirements and standards. Hydraulic power sales, inc. Is located in rancho cordova, california.
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