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Cheers muggles, Any idea with the switch? Does it sound like this just needs replacing as a common fault?

Will do Rampage77, thanks. I'm waiting for him to return (not living at property) so just trying a couple of things in the meantime. I was wondering whether it may be the pcb. The boiler seems to work fine when fired up, it's just the controls that seem problematic at the moment. Cheers

Thanks for your response, baz. So is it just a matter of replacing the MT10 timer then? Is this a straightforward job? Water came out of the plastic overflow, but tested again last night and no water was discharged. Cheers

Sorry I mean the on/off/timer switch on the clock on the actual boiler itself. The room stat hasn't been fitted yet so just working off the boiler for now. Tried again tonight, switch next to clock doesn't do anything but when timer is set manually (by pushing the small buttons on the clock in)...

Thanks nortonj, it was indeed a perished o ring. However, once re-pressurised to just over 1 bar, the boiler fires up ok and rads are all working ok but it only works off the timer dial, I.e. I cannot override using the on/off slider button at all. To stop the boiler, I have to change the timer...

Thanks for response nortonj, much appreciated. Can I please check that you mean the o ring on the end of the bent flexi hose that enters the plastic component (as seen in my image)? If so, I've had a look and it is intact however water seems to flow under the hose insert. I tested it again...

Thanks for your reply and concern, DP. I made sure the plumber was Gas Safe registered before he stepped inside my house, let alone touch my boiler. He also came recommended by a few people I know who had work undertaken on their boilers. He is not connected to my builder at all. Apologies if...

Any ideas? I'm now thinking it's the expansion vessel connection and is leaking where the flexi hose enters the plastic connection? Any help would be gratefully received! Thanks

Hi all, First post and hoping for some much needed help and advice please... My combi boiler was moved when building an extension and was working fine before. My plumber refitted the boiler but it wouldn't fire up and suggested it was the fan or pcb. However, after he left I reset the boiler a...