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Just reporting in, no tripping since the pump etc, but I'm still waiting and seeing. I do have another problem :D Since the cylinder went in (it's a Gledhill vented Stainless one) when the water is heating we get an almighty rumbling/vibration sound that I'm 99% certain comes form the boiler...

I left the heating on last night... no trip oddly... New pump and Programmer gone in to day in any case, so wait and see time for me...

I've actually bought one of these to make sure I wake up, it's a non maintained LED so come on with power loss :LOL: I'll keep looking for something audible as an ideal, I found one thing but apparently it's deafening, so not sure that's the way to go...

At a push, we'd need to either cut into the top of the cupboard to make space for it, or re-site it elsewhere, the electrician is coming round to have a look on Friday, but also yes, my intention was that the unit would go and we'd get a new one with RCBO's, rather than fit RCBO's to the old...

So this my very old CU, I have type AC on my RCD. I've got my (usually tame) electrician coming round on Friday to price me up an RCBO CU, and we've talked about splitting some of that large Kitchen/Lounge/Bedroom 1 & 2 plus utility room circuit up. I'll definitely be putting the heating on it's...

That's an interesting thought... I have an inkling this happens when the heating is hot due to when it has tripped in the past, so I guess that test wouldn't account for that? The other problem is how long it can take to trip, it can easily run fine for 10, 12, 15 hours then randomly trip...

So my thinking is get the pump done (which is happening on Thursday) double fingers crossed that alleviates the current issue and then I can get a new board with RCBO's to future proof things in case of future problems. When I do that I'll probably get the heating circuit separated from the...

The cooker is on a separate MCB, but protected by the same RCD... I was thinking back to last week, at one point I changed the settings on the pump because I was getting vibration on the new cylinder, I set it to Auto (it's a Grundfos Alpha+) which is when I *think* sometime later we started...

Directly next to the boiler, in the same circuit... Vaillant guy just been, he replaced the PCB purely to rule it out, he doesn't believe it is that. He did disconnect the pump briefly while we tried to make it trip, which it didn't, so his best guess is the pump, even though it all runs...

That's a bit tricky in my case because I don't think I have any sockets that are not protected by the same RCD... I only have the single RCD protecting all circuits, and the kitchen circuit has loads of appliances on it due to where the lounge etc are. So I think I'd need to get an electrician...

Yeah, his guess is a failing junction box... so he said see what Vaillant say tomorrow if no joy then he'll come back and start pulling up the floor to find it... assuming there is one. The other thing we realised through all the testing is that the entire back of the house (Lounge, Master...

No, nothing like that... as I say the most recent change was the boiler, although it was working okay for a couple of weeks... I'm mystified at the moment, my hope now is that the Vaillant guy comes out and says it's a faulty PCB or something...

Minor update, no obvious cause, he said that there is a difference in insulation readings in parts of the house, so in some cases he seeing 999M Ohm and in others 1.6M Ohm, although he says the 1.6 is still a pass... He said the RCD is tripping at 28ms so that's fine... so currently not much...

He's here now, he's got the fuse box in bits and is testing various sockets. Luckily he observed the fault, although not in the way I have, boiler running and heating,he flicked the upstairs light circuit on and it tripped, then as he was switching other things on, the downstairs lights to...

Very quickly, within a few seconds I'd say...

More tripping last night and today, today's one was a bit encouraging in a way because it seems to confirm an earth leak (or overload) on the Kitchen circuit. The wife had the fan-oven on and was boiling the kettle and when I turned the hall thermostat up to get the boiler to fire the RCD...

I must admit that was my initial thought...

It's an RCD... the reason I think that is that when it trips unless I switch the heating circuit off at the spur, I can't switch the electric back on, plus it happens almost regardless of what else is on or off in the house, I know it *might* be something else but it seems too much like a...

It's hard to tell, as it will generally trip while we're in the lounge watching telly or something, like I said in my initial post, it seems like stopping the boiler firing is what allows me to get the electric back on, so it's possible it's a similar problem to the one you described...

Thanks for the assistance guys I can't see any sign of water escaping anywhere at the moment... although I can't see inside the boiler... There not a lot to see as you can tell from the attached pics, is this what you meant? (Ignore the white cable with the two wires that's a separate supply...