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Hello and welcome to JustAnswer! This is James, I'm a Pool & Spa Engineer with over 20 years of experience, and I'll be assisting you today.
Sorry to hear your appliance is having issues, please stand by while I find the answer for you, this is not an immediate service however I will try and respond as soon as possible.What is the model number of your heater, and what do you mean by cutting off (does it trip the electrics, switch it self off or go into a idle mode)?
Without the information requested I can only provide generic advice at this stage, but happy to elaborate once you provide the addition info.For now I hope you may find this initial guidance useful.
Where the heater is tripping the RCD its likely you have an earth leakage fault which means a new element is required.