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thanks had a look at water pump it was wet so i disconnected its wires and boiler didnt trip so looks like the culpret i dont have a lot of time i work away and only have today to fix it it has iso valves either side of the pump but i bet they wont hold so is it a full system drain down to...

woke up this morning to no power. reset main switch no other mcb had tripped all ok but when central heating or hot water demand comes on the whole supply trips everytime. i have switched all off the other mcb's off exept downstair sockets and it still happens so it must be something that has...