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overheating, potterton kingfisher mf rsl40?

when hot water only is turned on it overheats and main heat controller stops being effective?
susan clark, June 2008
this boiler is not a combi so doesn't have a dhw exchanger.

sonray heating, June 2008
sounds like your dhw heat exchanger maybe scaled up and need replacing

T, June 2008
link Click here to see other fixes for Potterton Kingfisher MF RSL40.