I changed the Emergency Flasher unit in the bank of switches, which also includes the lock switch and it still did not work the door locks.
I tested the earthing wire and it completes a circuit when using power from the constant live wire going to the switches.
All the other ways to operate the switches work.
The wires to and from the switch have been lengthened with heavier gauge wire would that affect the resistance and hence the voltage to the pump, it did work like this last year though for some time. I am not sure when it quit working.
Anyone else have any ideas, please?