Code 35-11 Compressor High Compress Limiting — High compression ratio detected, system limiting capacity

What does 35-11 mean?

The system has detected a high compression ratio that cannot be adjusted by Automatic Envelope Management (AEM). The next startup will operate at a 25% reduced capacity. Each hour of operation without faults will gradually restore capacity. Repeated occurrences can lead to a lockout.

• Overcharge of refrigerant.
• Coil blockage.
• Loss of airflow across the heat exchanger.

Click steps to track your progress.

1. 1

   Allow the system to operate; it will attempt to recover by reducing capacity.

2. 2

   Inspect the outdoor unit coils for blockages (e.g., dirt, debris) and clean if necessary.

3. 3

   Ensure there is adequate airflow across the heat exchanger.

4. 4

   If the problem persists or recurs, contact a qualified technician.