Error 4220 (Detail 01) – Bus voltage error (PWM circuit fault / PAM damage)

What does 4220 (D01) mean?

An error is detected in the PWM (Pulse Width Modulation) circuit on the INV (Inverter) board. This can lead to PAM (Pulse Amplitude Modulation) damage and usually requires replacing the INV board.

• INV (Inverter) board failure

Click steps to track your progress.

1. 1

   This error indicates an internal fault within the INV board's PWM circuit, potentially causing PAM damage.

2. 2

   If this error persists, the INV board likely needs to be replaced by a professional technician.

3. 3

   Contact a qualified technician for repair and part replacement as internal components are not user-serviceable.