Cause : MF communication loss comes when master/follower communication is lost. On the FDCO module (if present), check that the DDCS link switch is not set to 0 (OFF)

1. Check the auxiliary code.
2. The code indicates which node address (defined by parameter 160.02 in each supply unit) on the master/follower link is affected.
3. Check settings of parameter group 160 DDCS communication.
4. Check the cable connections.
5. If necessary, replace the cables.