No Power To Rc Detected Nest

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There is no power going to my nest thermostat. Fan on is the high speed/cool speed. It says no power to rc wire detected v12tech: Oh i thought it was working.

Upon checking the nest unit downstairs, everything was back to working as expected. The safety switch that was being triggered is designed to be a kill switch to the air conditioning unit. When it's engaged, the a/c shuts off and more importantly, your nest unit will report that it's not receiving any power, which it's not. 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 is displaying the e74 no power to rh wire error code, there's a problem with the rh wire connecting the furnace to the thermostat. 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.