Those relays above MHC, if my memory serves me, are for doors and gate. About door locks, sometimes those were installed too close(keeper hanging on top part of the contact, instead of touching both), should be easy enough to correct.
Again, keep those relays on RMH board in good shape, you shouldn't have too much of problem. be perfect honest with you, I've never changed those battery yet(sheer dumb luck?)
Good Luck
Iggy
The relay's above the MHC board are for door lock monitoring and were install on jobs after 1997. The Eproms hardly ever go out. Yes if your Battery on the MHC goes dead on you with the power off your peramiters were just go back to defalt like the P.I. inputs, dwell times and so on but the elevator should still run and you need and "HHT" "service tool" to adjust them. I think they are great elevators and I have gotten to adjust and service a few of them
