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Thank you I will look at it when I get home. I assume I can switch off the spur at the main fuse box? Just so I do not cause an accident. Thank you again for the advice really appreciated.

Hi all After a rather loud bang, my Honeywell programmer has gone blank. Also the boiler will not work. Any ideas on where the fault might lie? I assume it must be a fuse. But wouldn't know the first place to start. The water tank is also connected, but the immersion switch will sort...