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worcester 24cdi combi. the DHW demand is flashing quickly.any ideas?

the DHW is flashing quickly and the book says call a service engineer. what can i try first?
richard grace, December 2008
think its fan/flue fault, if you reset can you hear the fan run before it starts flashing? if so its prob either knackered air pressure switch or common one, blocked or split/degraded hoses.

iain, December 2008
link Click here to see other fixes for Worcester 24CDi.