MikeSharp01 Posted November 6, 2018 Share Posted November 6, 2018 About 2 weeks ago our immersion heaters stat overheat protection tripped out. I changed the stat and yesterday it, the new one, tripped again. So something funny is going on. I guess it must be the boiler circuit overheating the tank and I adjusted the boiler stat down 5 deg last time but that seems not to have cured it. Is there another failure mode I asked myself. The only thing I can think of is that the bypass valve is leaking so even when it is shut hot water continues to get through onto the coil. I will check that later but is there anything I have missed? Link to comment Share on other sites More sharing options...
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