81 — Compressor temperature trouble

What does 81 mean?

This error indicates an issue with the compressor's temperature, which could be too high or too low. This condition causes the system to shut down for protection.

• Restricted airflow to the outdoor unit due to obstructions.
• Dirty outdoor unit heat exchanger coils.
• Refrigerant undercharge or overcharge.
• Faulty compressor thermistor (temperature sensor).

Click steps to track your progress.

1. 1

   Check for any obstructions around the outdoor unit that might restrict airflow, such as leaves or debris.

2. 2

   Ensure the outdoor unit's heat exchange coils are clean and free from dirt, dust, or blockages.

3. 3

   Power cycle the outdoor unit by turning off the main breaker for at least 5 minutes, then turn it back on.

4. 4

   If the error persists, a technician should check refrigerant levels and compressor operation.