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Another issue Leon,
I noticed whilst looking at the Control Box picture that the active (brown) and neutral (blue) transformer primary winding connection wires appear to duck past the (potentially) sharp edge of the sheet metal inside the case. See the picture I marked up below. Have your electrician check this out for safety. I doubt it's shorting as then the mains fuse would blow, but it is very poor practice with the wiring to create such a pinch point, if I'm seeing things correctly and not being hoodwinked by the plan view.
Best
JA
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