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Had problem with hot water going hot /cold .flushed system out,now central heating playing up.cannot get heating to remain on and rads are luke warm any ideas to whats going on. does any one know of a vokera engineer in the southend/essex area. thanks

hi can anyone help with this problem.hot water reaches 46 degrees then shuts down switches back on at 25. have changed thermistor, no change.can the heat exchanger be cleaned in place or is it better to take it out and get it cleaned