My boiler will only give hot water for about 2 mins it then goes cold.If i leave tap tunning it will get hot eventually again only for 2 mins.The led remains green throughout.I hear a clicking sound coming from boiler when it heats up.It then clicks again making water go cold.Any ideas appreciated

john, March 2009

Sounds as though you are getting insufficient water flow across the exchanger. Try increasing the flow rate via the cold water supply tap located underneath the boiler. The other thing could be that the flow regulator valve situated on the DHW supply pipe right at the exchanger is swollen and reducing your water rate through the exchanger.

Bill, May 2009