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Thanks for the reply, given that the RCCB is 30 years old I'm guessing they have moved on a bit. Any recommendations?

Any advice would be most welcome, I have a Crabtree 80A RCCB 30mA trip. It's the original unit in my house that was built in 1988. There has always been an element of nuisance trips mixed in with the genuine stuff (stuff I could account for). Recently it has started to trip more frequently, and...

Thanks very much Nozzle

Hi Nozzle, and then boiler stops when water gets to temperature... Thanks

Hi Nozzle, with HW only on and lever pushed to CH all radiators are hot!

Thanks Nozzle, will try and report back

It's a Vitodens 100, about 10 years+ old, never seen any mention of weather compensation. Thanks

First of all, thanks for all the questions and suggestions, regarding the system, it's a conventional viessman boiler (not a combi). And to summarise from the comments so far, there's a good chance the wiring is fecked. Once again I thank you!

If I was guessing (and I am) I'd say it wasn't working prior.

I can't be sure as previously I hadn't ever run it independently. CH & HW were programmed together

It's entirely possible that this has happened (been happening) for a while, given that in the past the HW & CH have been on together. Have recently put in a Nest thermostat so had tried Heating Only, only to find that it didn't work. So quite possible that have thought heating was working when not.

The radiators "appear" to get warm until the hot water is up to temperature and then cool off

Gets a little stranger, if I turn the heating off and the water on, all the radiators all begin to warm up

All radiators are cold, pump is ok, boiler is firing, hot water works, bi directional valve working. Pipes leading from the pump are good and hot but absolutely nothing at the radiators. Struggling as to what to do next

If I shut down all the rads in the house I can get them to heat up (but not as quickly as I would expect) but they don't stay hot. All other rads in the house are hot, with the exception of the lounge rads which occasionaly (and it is occasionaly) seem to go off when all other rads are on...

I've had a look around the other threads but i'm still struggling. I have two radiators in the conservatory that on occassion get very hot and quite often are stone cold. All other radiators are fine. I've tried the bleeding and balancing and taken them off an flushed them out. usualy they then...

Thanks for the suggestion, but I have tried this... what's more there are two radiators with the same symptoms so my logic says it's unlikely to be a valve problem

Yes, but I have tried taking them off... this had no effect

I've had a look around the other threads but i'm still struggling. I have two radiators in the conservatory that on occassion get very hot and quite often are stone cold. All other radiators are fine. I've tried the bleeding and balancing and taken them off an flushed them out. usualy they...