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I have no idea? Just the one supplied. I changed the control box (containing the lock out switch) and changed a fuse. Seems ok now but wondering where condensation inside the control box came from

Hello :) what fun I’ve had tonight. I have an elderly boiler as above but it’s been visited a few times and has lots of shiny bits on, just like Triggers broom. The lock out switch came on (not seen since last winter) so I took the main cover off and then the lock out switch cover and performed...