What could be the problem with the CU212 Grundfos?

Question

Electronics

This is a hard logic controller. A level float with on-off contacts is connected to its input. Occasionally a general fault is triggered. After resetting the fault, it works normally. At least some possible reasons.

Answer 1

Kosyachnoe power and pickup, as an option.
You can also think of all sorts of exotic things like reducing the insulation resistance of the motor.