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I was thinking of doing that because I like to have a spare, but I'd made the guess that because it wasn't even clicking it was likely that the micro switch had actually failed outright and seeing as there were direct replacements available on ebay, new, for £35 it would be better to have a new...

Thanks that does make sense. I've done several tests now and everything now seems to be behaving as normal. I now understand what those metal boxes are and vaguely what they do! I'm not quite 100% on how that failed actuator was keeping the heating on all the time though...

Ok so closer possibly to resolution. I didn't realise that both these actuators have a metal override lever on top which switches between automatic and manual open. That helps with the aligment as well as hearing what the noise should down like. The D shaped spigot took a few attempts to align...

The way you've worded it is difficult to answer. If I switch on the boiler's isolator it will just central heat the house until we all cook. Turning the hot water on after that does click the actuator going into the hot water cylinder. Turning the boiler's isolator switch off and on or turning...

Ok thanks - progress. I took the actuator off and the valve moves easily with my fingers. I re-fitted the actuator and then turned the heating on - no noise. I turned the hot water on and the other valve/actuator makes a definite click/noise both turning on and turning off. So do I conclude...

Dumb question but i'll check - Is the heating valve the one adjacent to but *not* connected to the inlet to the cylinder? Just want to be sure that it's that 'other one' in the pic or its likely to be elsewhere in the house....

I've read they can get stuck of sieze up....?

That's my next step. Is a whack with a hammer likely to help?

There look like 2 - one going into the cylinder and one not....

I don't know that I do. How can I tell? It's an Ultimate 80FF. I'm not a HE... The hot water controller is set to off, the themostat controller is set to off, but it's still keeping the house at 25 degrees!

I don't have any. It's just one zone - the whole house. And the boiler doesn't have any freeze protection because it's housed inside the house itself (in a downstairs toilet). It does seem to have changed since disabling that one radiator. It now does come off and on but it's mostly on. It's...

Hi Everyone I've got a quite old Glow Worm Ultimate 80FF. It recently had an issue with the control stat (lots of green corrosion on it which was causing it not to come on) and I fitted a new one and I'm back in business. Everything was fine for a few days and now it's just always on. We have...