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Big thumbs up to Gasguru and Werewolf !! Problem solved - replaced microswitch (old one was corroded and stuck) and all now functional. Everyone is happy in the household tonight. Best Wishes All !

Pardon my ignorance, but what do you mean by "this fault condition is in mi". Cheers

The DHW switch appears to be OK, at least I can see the spring moving. The microswitch looks a bit 'black', so I'll change that first and see if that's the cure. If I put a meter on the terminals of the microswitch, what should I be reading ? Thanks for the advice.

Hello. Can anyone out there advise on how to disassemble the case of a Sony Vaio K415B. My laptop is running very hot and I want to get the base open to take a look at the fan with view to cleaning etc. I can locate/ remove the 9 screws on the base, but the to separate the lower case from...

Hello, any advice on this problem would be greatly appreciated. The boiler (when mains is on, boiler switch on, ch switch set to off) fires up instantly and pushes heat out to the radiators. The ch flow pipe heats up rapidly and the boiler (usually, but not always) goes to 'lock-out' and...