Sorry I should have been more specific. Repairs were wall building and plastering. Nothing electrical. If there was any damage to the boiler electrical supply then surely it would blow the RCD regardless of whether the boiler switch was on or not. This only happens when the boiler switch is...
I have just bought a house in which a Baxi boiler was installed in 2008. The system worked perfectly OK. As there was considerable repair work needed to the property, we shut off the system, drained the central heating down and got on with the building work. Now everything is complete we have...