Immersion heater fault

Hi any thoughts or insight into this fault much appreciated. So it's a 3kw immersion heater that's been causing the water to be scalding hot. It also blew a 15 amp rewritable fuse prior to me changing the stat earlier, anyway just had a text saying the water is still scalding and it's blown the fuse again. I'll go and have a thorough check tomorrow but I'm thinking the immerser may be on its last legs and needing completely replaced. Thanks for reading and look forward to reading any replies. 

  • Just to update i got the plumber to fit a new immerser having found really low IR reading between terminals and earth on the old one , my new thermostat was also fried. anyway i thought all good when i left the job this afternoon but just recieved a text saying water still scalding and despite the boost on the economy7  controller having been been off for a few hours the customer noticed the meter spinning fast and isolated the immerser main switch ( old wylex board) . so the only other thing is the E7 controller that can be at fault ,but surely the stat  would cut out at 60 degrees even if the power is on constantly.... as ever all thoughts and advice appreciated.

  • None of that would overheat the water.

    Have you thought about taking a thermometer with you next time?

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