What does 4 mean?

The Inverter Power Module (IPM) is not able to communicate with the main circuit board (PCB). This prevents them from coordinating operations.

• Wiring issue between IPM and PCB
• Faulty IPM
• Faulty PCB

Click steps to track your progress.

1. 1

   Check the wiring and connections at CN9 on the PCB and CN15 on the IPM.

2. 2

   Verify correct voltage at the IPM CN15 connection.

3. 3

   If voltage is correct but communication fails, replace the IPM.

4. 4

   If voltage is incorrect, replace the PCB.