topic Re: E73 error no power to Rc wire detected solved in Nest Thermostats

E73 error no power to Rc wire detected solved

Mikapop — Tue, 26 Mar 2024 00:51:27 GMT

Got the famous E73 fault no power to Rc wire. If you live in a humid climate, make sure the drain for the evaporator pan is not clogged. Mine was and triggered the float switch. Cleaned the drain and reset the switch. E73 fault disappeared! Cold air again!❄️

Re: E73 error no power to Rc wire detected solved

tajennifer — Wed, 03 Apr 2024 20:48:06 GMT

Hi Mikapop,

Thank you for posting such valuable information in the community! I'm glad that you cleaned the drain and reset the switch. E73 fault disappeared! Your solution saved the day!

Best regards,

Jenny

Re: E73 error no power to Rc wire detected solved

Mom2three — Wed, 01 May 2024 03:16:01 GMT

Hi! Where would the drain pan be located?

Re: E73 error no power to Rc wire detected solved

tajennifer — Wed, 01 May 2024 18:54:41 GMT

Hi Mom2three,

Thanks for posting. In this case let me tell you, the drip pan is connected to one or more drain tubes. These are usually plastic tubes that carry water from your AC unit to a drain or to the outside of your home. They can usually be found on the side of your furnace.

You can check the "Troubleshoot thermostat power issues during hot weather" article for more information.

Please let me know if you have more questions.

Regards,

jenny