the problem you have is very common,the secondary heat exchanger is partially blocked.remove the unit this takes about five mins.flush out by alternating the flow i use an old washing machine tap hose witch fits on to the heat exchanger.after flushing put the heat exchanger in the oven on medium...
Thanks for the advice central heating works fine,no luck with the hot water it runs up to 45 starts banging and shuts down although the noise is coming from the top heat exchanger :?:
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