4250 (4350) IPM error - Short-circuited IPM/Ground fault

What does 4250 (4350) mean?

This is a serious electrical fault indicating a problem with the Inverter Power Module (IPM), specifically a short-circuit or ground fault. It can also point to overcurrent issues due to a short-circuited motor.

• Short-circuited IPM or ground fault.
• Overcurrent error due to short-circuited motor.
• Instantaneous overcurrent (software detection).
• Overcurrent (effective value) (software detection).
• Incorrect setting for the model selection switch (Dipswitches SW5-3 - SW5-8) on the outdoor unit control board.

Click steps to track your progress.

1. 1

   Immediately turn off the power to the outdoor unit at the main circuit breaker.

2. 2

   Do not attempt to restart the unit until a professional inspection, as this is a critical electrical fault.

3. 3

   Contact a qualified electrician or HVAC technician to diagnose the inverter, compressor, and IGBT components.

4. 4

   The technician will also check the settings for the model selection switch (Dipswitches SW5-3 to SW5-8) on the outdoor unit control board.

5. 5

   This fault requires specialized tools and expertise for safe diagnosis and repair.