Rh Wire Not Detected Nest

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If you are getting an e73 / 74 error message on your nest thermostat, which is code for rc / rh wire not detected. It actually works for most hvac units. We use cookies to give you the best possible experience on our website. Unfortunately only two wires are available in t.

This problem will result in power loss to the furnace and is often caused by a blown fuse, a faulty transformer, or a flooded float switch. You may be prompted to look at the screen if your nest starts acting up for unknown reasons. If you receive an e73 error message on your nest, it means there's no power to the rc wire. The "no power to rc wire" message is commonly due to incorrect or loose wiring. Before checking the wiring, first, make sure the hvac breaker hasn't tripped. If your nest thermostat gives you an "e74" error code, it is notifying you that no power to the rh wire is detected. When that happens, your first reaction might be to look for the hvac technician's telephone number. Can't you troubleshoot and fix. Nest thermostat owners now say that they are getting error n72 with a message that reads "power wire rh detected.