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Well, I haven't been doing the work myself, I've been there to allow the repair-bloke access (OK, Hands up, I did "adjust" the lever on the microswitch :oops: ) & yes, Safety certs every year.. :!: 8)

He's happier now....he dropped the flap at the front of the boiler, & put the hot-water thermostat dialie-thingy back into its original position (About 2/3rd of max)....I guess it got nudged down by the plumber/heating guys sausage-fingers. So, AT THE MOMENT...all is well..... :D

Ok...diaphragm replaced..made an improvement, but still temperamental. .. The old diaphragm was fairly hard/brittle, BUT, I would of thought it would have been functional. Having seen the comments above about the pin not quite activating the micro-switch, I put a little kink in the...

Did you manage to resolve this?...I have a C24 doing exactly the same. The Change-over solenoid (Three-way valve motor) has been replaced, and the Diverter-valve has had all moving pars replaced (service kit). I have just bought a diaphram/switch membrane which is being fitted tonight....am I...