Contact Nest Customer Support. The fixes mentioned above are the best troubleshooting steps if your Nest thermostat detects an E73, i.e., no power fault on the RC wire. However, getting in touch with the Nest support team is the only option you are left with when you have already tried and failed at attempting every other troubleshooting method.. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright.
e73 Error On Nest Thermostat (FIX)If you want to be able to fix the E73 error on your Nest thermostat, then this video will be perfect for you!Let me know in.. If your fuse burns out your system may stop sending power to your Nest Thermostat and cause one of the following codes might appear on your thermostat: E3; E4; E23; E24; E73; E74; 1. Turn off the main power to your HVAC system at your breaker. Your HVAC system can have multiple breakers so make sure to turn them all off before moving on.