Pre-2020 manufactured CW-H FC7 (Fault code 7) Motor Error 


Pre-2020 CW-H FC7 (Fault Code 7) Motor Error

Steps to Diagnose and Resolve:

  1. Check 3-Phase Power Supply:

    • Ensure all three phases are present and have similar values.
    • Verify each phase to neutral and between phases.
    • Check the incoming mains supply and the 3-phase supply in and out of the motor contactor.

  2. Motor Circuit Pull-Up Resistor:

    • Make sure the pull-up resistor is securely connected to the motor's wiring connector.

  3. Motor Cable Connection:

    • For Gen 3 EBM motors, ensure the motor cable plug is firmly connected to the motor board and wired correctly.
    • Older EBM models use terminal blocks.

  4. Fault Signal Wiring:

    • If the motor runs briefly and then stops, the issue may be with the fault signal wiring (yellow and white wires).
    • The motor's relay is normally closed but opens when a fault is detected, causing an FC7 error.

Possible Causes:

  • A real fault in the motor.
  • Poor connection or damaged fault signal wiring (yellow and white) at the motor or control box.

Testing Fault Signal Wiring:

  • Bridge the yellow and white motor wires at the PCB.
    • If the motor runs, the fault is in the signal wiring.
    • If it doesn't run, the motor itself has a fault.

IMPORTANT: Troubleshooting for Pre-2020 Units:

  • Double-check all connections, especially the motor cable plug and fault signal wiring.
  • Inspect for water ingress in the motor connections. Clean and dry if necessary.
  • Confirm the motor circuit pull-up resistor is securely connected.
  • If the error persists, there may be an actual fault within the motor.




Make sure the pull-up resistor for the motor circuit is firmly attached to the motor's wiring connector.




At the back of the motor, make sure the motor cable plug is firmly connected to the motor board and wired correctly. Note that only Gen 3 EBM motors use this plug setup; older EBM models use terminal blocks. 






If the motor runs briefly and then stops, the problem is likely with the fault signal wiring (yellow and white). The motor's relay is normally closed, but if the motor detects a fault, it will open this contact and cause an FC7 error.

Possible causes:

  • A real fault in the motor
  • Poor connection or damaged fault signal wiring (yellow and white) at the motor or control box

To test the wiring:

  • Bridge the yellow and white motor wires at the PCB.
  • If the motor runs, the fault is with the signal wiring.
  • If it doesn't run, the motor itself has a fault.