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Ravenheat RSF 820/20.Hot water luke warm?

When taps are turned on the combi boiler fires up and for less than a minute the water is hot.
After that the water goes luke warm,checked boiler at this time,boiler still fired up.
Any one help me with this problem.
cheers
albar
albar, February 2007
Cheers Ben,i'll give it a go.
albar

albar, February 2007
deffinately boiler has sludge in plale to plate heat exchanger. needs to be replaced or taken out and cleaned

ben, February 2007
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