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Mend Ravenheat RSF 820/20 30 Seconds Starts

how can i fix my ravenheat rsf 820/20?

hi every one, my boiler lights up for about 30 seconds starts hissing (only way 2 discribe) then shuts itself off, plus ive just noticed water dripping from the pump

mark
April 2009
check pump operation sounds like overheating, circulation problem

STE
April 2009

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