u/Fine-Bottle-16

Trying to troubleshoot my AC system which is not turning on after the winter.

System is located in the attic and was installed in 2020.

We have a Trane air handler with a Honeywell wireless transmitter and Honeywell wireless thermostat.

The transmitter does not appear to be getting power and thermostat is saying no system connected.

I have already checked the breaker and confirmed with a voltage tester that power is getting to the air handler unit. I checked for loose Tstat wires. I also jiggled the float switch and it’s not stuck (and no sign of water leaking). Still no power to transmitter.

Anything else I can troubleshoot as a homeowner to see if it’s the transmitter that needs replacing?