U2 - Inner thermostat (49C) operation activated

What does U2-2 mean?

The inner thermostat (49C) in the outdoor unit has activated, likely due to an internal overheat condition. This triggers a safety shutdown to prevent damage.

• Overheating of a component in the outdoor unit.
• Malfunctioning 49C thermostat.
• Restricted airflow around the outdoor unit.

Click steps to track your progress.

1. 1

   Turn off the main power to the outdoor unit at the breaker and wait for at least 30 minutes for it to cool down.

2. 2

   Clear any visible debris, leaves, or obstructions from around the outdoor unit.

3. 3

   Restore power and restart the unit. If the error reoccurs, contact a service professional.