Hello folks,
Thanks for reaching out to our Nest Community about this E73 error code. We understood the situation. Don't worry, I'm here to find a solution.
Let me lend you a hand. I suggest performing these troubleshooting steps on your Nest Thermostat to find the solution.
- Check your HVAC filters and drip pans.
Check your HVAC fuse.
- Check all the wires. Make sure that they are properly inserted. If possible, try to re-strip them to expose new copper wire.
Note: Make sure to turn off HVAC switches before touching any wire.
Feel free to keep us posting with more details, and definitely I will do my best.
Best regards,
Douglas.
