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My hot water timer is set to off but the water still heats up ?

My hot water cylindar keeps heating the water even though I have turned Hot Water to off on the timer. It is so hot that it burns. How can I switch it off until I can afford to have it looked at?
Thanks
Julia, February 2009
check that zone valve is faulty and left open mode thus effectively microswitch closed and boiler keeps firing to heat the water

Mr K, February 2009