Mate the same thing has happen to my Aqua Tronics W7000. It can only maintain hot water for several minutes then goes cold and hot repeatively. I opened it up and found most of the parts rusted inside and obviously something is malfunctioning. But I think it is at least 10 years old so the best solution is just to buy a new one. You can get then for around 100 pound or even cheaper. I will be avoiding an Aqua tronics make thou.
Nathan
October 2006
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