Error A3 (10 Green, 3 Red Flashes) — Compressor temperature protection

What does A3 mean?

The hydraulic unit's green LED flashes ten times and the red LED flashes three times. This signifies that the compressor's internal temperature has exceeded safe limits, triggering a protective shutdown.

• Overheating of the compressor due to heavy load or malfunction.
• Insufficient refrigerant in the system.
• Blocked airflow around the outdoor unit.
• Faulty compressor thermistor.

Click steps to track your progress.

1. 1

   Turn off the heat pump system at the main breaker, wait for at least one minute, then restore power.

2. 2

   Clear any debris, leaves, or other obstructions from around the outdoor unit to ensure maximum airflow for cooling.

3. 3

   Ensure all indoor unit filters are clean to prevent restricted airflow and potential system overload.

4. 4

   If the error reappears, contact a qualified technician, as it may indicate a refrigerant issue or a failing compressor.