NRR30 S/N: 2GL02432 When this unit is turned on, it does a selftest and the three other contacts 1S, PC, P, click in for test. It displays a code 23. My guestion is, should all four 1S, PC, P, B, contacts click in/on for the selftest ??. The contactor B Why the copper contact bar was removed and not replaced, is unkown. Work/repair to this unit was done, before I was the owner. The nut, spring, that holds the bar on, was all there. Any help would be very gratefull.