I'm doing this little write up as a suggestion to help with Nest support troubleshooting. I ran into a situation that resulted in an incorrect diagnosis of a faulty thermostat by NEST support. If I'd returned the thermostat, it would have been a waste of a perfectly good thermostat.
I was getting either an E23 or E73 error code from the NEST. This is a complaint about no voltage coming from the 24vac red wire, but when I tested with a multi-meter, it was showing 24vac. There's an additional thing you can try to narrow down what's wrong:
1) Disconnect the cooling wires (on my system Yellow) but make sure the Fan Wire (Green,) Heat Wire (White,) and 24vac wire (Red,) remain connected.
2) This will cause the NEST to switch to heat only mode
3) Now that the NEST has bypassed the circuit for cooling, it might then detect voltage on the 24vac wire, and the NEST will no longer be in error mode
4) This is an indication that the NEST is receiving power and is NOT FAULTY
5) This means the problem lies in the AC unit itself.
6) Locate the issue on the cooling call side in the AC unit. In my case, it was a tripped float switch due to a clogged drain line. Once the drain line was cleared, the circuit was remade and NEST happily worked in cooling mode again.
I just spent $100.00 to fix my nest thermostat with a company that says it can guarantee they will fix my AC, that is not cooling. E23 error code keeps coming up. I know nothing about electricity or what computers have to do with my thermostat or how it's all of a sudden on wireless network that I never set up. In fact, I don't have the nest connected to anything but electricity. I have no nest account. I have no other nest products. This unit seems to have a mind of it's own, all of a sudden. It also works during the day, but around 4pm, I notice how warm and stuffy my condo is. I look at thermostat, and sure enough, it says it's not connected to power, along with the E23 error code. I've lived here for 4 years with no problem. I live in florida, so I can't survive here without an ac.
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