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I have an 10kw electric shower which is run through a double pole pull switch which is connected to an individual 40A MCB + RCD box connected direct to the meter. All cables are 10mm. About 2 minutes after the shower is switched off the MCB trips. A new shower has been fitted and still the...

My Ferroli Optima Boiler struggles to ignite due to a buzzing/chattering Relay. Apparently this is a fairly common fault and a new PCB costs about £180. The chattering Relay is the one to the far right of the PCB and often looks burnt due to the sparks caused as it chatters. After much...