Error 400 — Overheat due to contact failure on IPM of Inverter PBA2

What does 400 mean?

The outdoor unit's Inverter PBA2 has an IPM (Intelligent Power Module) that is overheating, likely due to a contact failure. This is a critical fault.

• Contact failure within the IPM
• Poor heat dissipation
• Faulty Inverter PBA2

Click steps to track your progress.

1. 1

   Ensure the outdoor unit's heat dissipation pathways are clear of obstructions.

2. 2

   Check the connections to the Inverter PBA2.

3. 3

   This error indicates a serious internal fault requiring immediate attention from a qualified technician.

4. 4

   Do not attempt to operate the unit until repaired.