A5 — High pressure or freeze-up protector activated

What does A5 mean?

This code suggests that the system's high pressure has been triggered, or a freeze-up condition has been detected. This is a safety mechanism to prevent damage.

• Blocked airflow to the indoor or outdoor unit
• Low refrigerant charge
• Dirty air filters

Click steps to track your progress.

1. 1

   Ensure air inlets and outlets on both the indoor and outdoor units are not blocked.

2. 2

   Check and clean the air filters on the indoor unit.

3. 3

   Contact a qualified technician to check refrigerant levels and system pressure.