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Hi Susy, there may well be a fuse blown on the printed circuit control board, it happened to me once.

It's accessed by taking the plastic cover off of the top of the hot water tank, you should see it down one side.  Do make sure the  mains electric supply is disconnected (although I think the fuse is on the 12 volt side.) From memory it's a 20 mm glass fuse about 500 or 600 milliamps. Good luck.

Dave

Quote: Originally posted by Susyq2it on 27/8/2013

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Thanks for all your replies. we have tested the fuse thats fine. have cleaned out the pipe to make sure no spiders ect. we have found that at certain times it starts up on 30 deg but as soon as it gets to temperature it cuts off. we seem to think it might be either the circuit board or the thermostat.

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