Output Contactor Stuck Closed

What does FCF1 mean?

Indicates that the output contactor is detected as stuck in the closed position when it should be open. This is a critical safety fault, as power may still be applied to the motor when it should be disconnected, leading to uncontrolled startup or dangerous conditions.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Manually actuate the contactor to check for free movement and reliable opening.

2. 4

   Measure continuity across the contactor terminals to confirm its open state when de-energized.

3. 5

   Replace the faulty output contactor if it fails to open reliably.