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Swapped Blue and Black at the wall switch, and the problem is solved ! Kids still afraid of hot tap, but they'll learn as the winter closes in... Thanks for all your help, Jon

Thanks bernard, I'll try that tonight....

old rod stat also allowed the water to overheat. Not sure if this immersion ever worked correctly since it was installed. I turned the new stat way down and it still faied to cut out the immersion, although as i rotate the temp. adjuster i can hear it click on and off at approx. the right temp...

Vented I think - I could empty the tank by turning of water supply at rear of tank, not the mains supply. System installed approx 30 yrs ago - tank and immersion replaced 2 yrs ago, with no major plumbing alterations. There is a hot water feed from a wood burning stove, flow controlled by a...

Of course you are right.. stat on the neutral as you describe - photo not great but you can make out blue coming in to Over-ride, and re-set, on to stat and to the two coils... what do you think I should try next??

immersion photos

I replaced the stat, and the problem remains - new stat is "working" as I can hear it click on and off as the water in the tank cools.. It's a dual immersion, and on the old stat, the "bath" setting did not heat any water. Wall switch seems to be wired correctly. Bath setting now overheating the...