Trane Overheating Thermostat Electronics

Thermostat emits a burning smell or feels unusually hot to the touch

Advertisements

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Advertisements

Possible Causes

Internal component failure, Shorted backlight or power regulator, Installed on hot wall surface, Excessive voltage on control circuit

How to Fix / Troubleshooting

Critical safety warning: If you smell burning plastic or see smoke, immediately turn off power to the HVAC system at the breaker and do not use the thermostat.

  • Step 1 – Shut down power: Turn off the indoor unit breaker and any dedicated thermostat power source.
  • Step 2 – Inspect thermostat: After cooling, remove the thermostat and check for scorch marks or melted plastic.
  • Step 3 – Check control voltage: Have a qualified person verify that the control voltage between R and C is around 24 VAC and not excessively high.
  • Step 4 – Replace thermostat: Any thermostat that has overheated or shows signs of burning must be replaced. Do not reinstall it.
  • Step 5 – If overvoltage is found: Have an HVAC technician inspect the transformer and wiring for faults.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Trane Smart Thermostat
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements