Error A1 (10 Green, 1 Red Flash) — Discharge temperature protection

What does A1 mean?

The hydraulic unit's green LED flashes ten times and the red LED flashes once. This indicates that the system has activated its protection due to an excessively high refrigerant discharge temperature from the compressor.

• Low refrigerant charge in the system.
• Overload on the heat pump system.
• Clogged or dirty heat exchangers reducing heat transfer.
• Malfunctioning expansion valve.

Click steps to track your progress.

1. 1

   Power cycle the heat pump system by turning off the main breaker for 60 seconds and then restoring power.

2. 2

   Ensure the outdoor unit's heat exchanger is clean and free of obstructions to allow for proper heat dissipation.

3. 3

   Check that the indoor unit's filters are clean and not restricting airflow.

4. 4

   If the error persists, contact a qualified technician to check refrigerant levels and inspect system components.