Error 4220 (Detail 109) – Abnormal bus voltage rise detected

What does 4220 (D109) mean?

The inverter detects a DC bus voltage of 380V or higher during operation. This often indicates an incorrect power supply voltage connection or an internal issue with the INV board.

• Different voltage connection (incorrect power supply voltage)
• INV (Inverter) board failure

Click steps to track your progress.

1. 1

   Check the power supply voltage at the power supply terminal block (TB2) to ensure it matches the system's required specifications.

2. 2

   If the power supply voltage is confirmed to be correct, the INV board may be faulty and need replacement.

3. 3

   Contact a qualified technician for further diagnosis and repair if the issue persists.