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E23 after battery died

Community Member

Last week noticed it wasn't cooling in my house. Ok pulled of the head unit put it on charge no issue checked over r wire confirm 24vac going to wire and c is completing the circuit. Just in case I checked the water shut off the voltage from the transformer the ground replaced the transformer out of frustration with no avail. Still saying e23 wire found no voltage but it has 24v 24.3 to be exact can jump the wire and command ac on no issue. Heater works as well. Reset the system flowing the flow chart and can't get past the set up due to it not recognizing voltage on r. This is a gen 2 and has had the common the entire time.


Community Specialist
Community Specialist

Hello Ozz904,

I'm sorry to hear that your AC won't work because of the wiring report. I'd love to help.

It appears that your system might not provide enough power or any power to either the thermostat or a specific wire (so the thermostat can’t complete a circuit and shows a report). To isolate, please gather the power readouts on your thermostat under the technical info settings. Also, let's try the steps in this guide:

  • Make sure that the breakers are on.
  • Make sure the thermostat wires are properly stripped and seated in the thermostat base.
  • Remove the C wire and leave it disconnected.
  • Check the air filter. If it is dirty or hasn't been replaced for over a month, clean it or remove it and replace it with a new filter. Make sure everything is closed properly.
  • Check the drip pan or drain tubes. It must be drained or vacuumed.
  • Check the condition of the HVAC fuse.

Note: turn off the power from your HVAC system at the breaker box before touching the wires.

Please keep me posted on how it goes.



It was a fault in the base circuit board replaced the whole unit

Community Specialist
Community Specialist

Hi there,

Oh no! I'm sorry for the trouble this may have caused you.

I appreciate the update, and it's good to know that you've already replaced it so you have cool air at home. If there’s anything else I can help you with, please let me know.



Community Specialist
Community Specialist

Hey there,


I am glad to hear you are good to go. I wanted to check in, and let you know that I will be locking the thread in 24 hours.


Best regards,