Alert 35 — Incorrect Operation of DEVICE 2

What does 35 mean?

A communicating device in the system has been disabled due to a fault. The thermostat may have asked for heating or cooling, but received no response from the unit, or it asked to stop but the unit did not respond.

• A communicating device has a fault or lockout code.
• Electrical noise interference affecting the communicating system when the compressor contactor coil is energized.

Click steps to track your progress.

1. 1

   For communicating systems: install a transient voltage suppressor in parallel with the compressor contactor coil terminals on the outdoor unit.

2. 2

   For non-communicating outdoor units: install a transient voltage suppressor (89W72) in parallel with the compressor contactor coil or across the Y1 and C terminals on the indoor control board.

3. 3

   Contact technical support for assistance in acquiring a transient voltage suppressor if needed.