Error 4 — Communication failure between IPM and PCB

What does 4 mean?

The Inverter Power Module (IPM) is not communicating with the main Printed Circuit Board (PCB). This often points to a wiring issue or a faulty board.

• Wiring and connections between IPM and PCB are faulty
• Incorrect voltage at the IPM connection

Click steps to track your progress.

1. 1

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

2. 2

   Verify correct voltage at the IPM CN15 connection.

3. 3

   Replace the IPM if connections are good but communication fails and voltage is correct.

4. 4

   Replace the PCB if communication voltage is incorrect.