hotwater goes hot then cold have replaced potentiometer and dhw sensor but still runing hot then cold

ajeff, February 2013

The boiler works as normal, except the Pressure keep dropping below 1 Bar and we have to repressurise the system every week. Can you please Advice / Clue as to the reasons fot this fault.

alic, March 2013

what u can do is get some sentienel x800 to clean it. boil some water then put into a bucke add half the x800 into it. then sitt the heat ex into the bucket. make sur u where rubber gloves. then leave for a few mins. then turn it around leave for a min. after this raise it out the water allowing it to redrain into the bucket. keep inserting into the bucket shaking it around and lifting and draining it for around 10mins. u will see the water should be black with dirt. now wash it off and refit it and it should be fine it works for me on many occasions. u can also find them on ebay theres lots on there for your model.

ajeff, March 2013

have tryed to find new but canot find supplyer can the unit be cleand by radiator descalor

ajeff, March 2013

change the dhw heat exchanger as its scaled up or get an engineer in to clean it

ajeff, February 2013