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rhb
Fuse replaced at switch we have power to boiler again. F7 error code which is

F7 Flame detected even though appliance switched off. Check electrode assembly, dry pcb. Flue clear?

Is it within the realm of diy to get the pcb out and dry it above our dehumidifier then safely refit it? I can isolate the power, obvs.

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Chaley in reply to @rhb

As long as you’re not touching the gas side, I say go for it.
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bluehuw in reply to @rhb

somehow I thought you'd said it was sending hot water to the radiators unexpectedly? Is that when hot tap was turned on?

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