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Hi, just to let you know that I fitted a replacement heater today. Exactly the same model as the first one. Yes it worked perfectly! So the first new one must have been faulty, even through it tested OK with a basic multi meter. So, thanks to everyone for their comments, the help was...

Hi Andy, yes I have tested with good but basic multi meter, no connection between the neutral and earth or live and earth. 19 ohms on the element, which I think is about right. So with my basic tools it would seem OK and it is a brand new Tesla Titanium unit. Getting a new one as I really don’t...

I managed to get a couple of hours today, so had another try. I disconnected all the neutrals bar the immersion and switched off all MCBs bar the immersion. Guess what still the same! So I tried a new length of 2.5mm twin and earth laid down the hall. Yep still the same. So a new immersion...

Hi, no problem, I appreciate all the help in getting. Pete

Hi,only thought I'd switch off the MCB AND disconnect the neutral to each circuit in turn, to completely isolate it. Is this correct? Cheers Pete

Hi Thanks again for the help. Yes, cable changed for new one and also run off a nearby but on separate MCB ring main and same problem. Insulation and resistance of the new heater seems OK, but only measured with a standard type multi meter. Next step is to try disconnecting some neutrals as...

Hi, really appreciate the replies and explanations, cheers. So next plan is to get another heater and try that, if that doesn't sort it I'll disconnect the neutral and live from each circuit in turn and see what happens. I'll let you know, but will be a while as other jobs (and work!) are...

Hi Bernard green, thanks for your reply. So if I try the heater with other circuits switched off, that may help identify a problem on the disconnected circuit. Just one thought, if that was the problem, wouldn't turning on another high load device like the oven, cause it to trip? Thanks Pete

Thanks for the reply Ericmark, all makes sense. I’ll have another check tomorrow and then may have to get in help! Thanks again, Pete

Hi, yeah, checked and double checked. To be honest they are pretty straightforward, even for me! I’ll leave it for tonight and check again tomorrow, as been a long day! Pete

Hi, thanks for the quick replies. Yes, tried it from a nearby ring main covered by the same RCD Yes, both the old and new wired correctly. The old one worked fine for at least 20 years Pete

Hi, sorry but another immersion heater tripping RCD, question! I’ve read loads but no seems to have the same issues I’m having so would really appreciate some help. Two weeks ago the RCD tripped. Narrowed it down to the immersion heater. As by coincidence I was planning to change to the hot hot...