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how can i fix my bosch worchester 24cdi boiler?

The water Led is flashing 5 times per second the guide says Air Flow fault (RSF) or FLUE GAS Spillage (OF)

Harry
February 2012
BoschHeating, Home Heating SystemsBosch Water Times Second
the fan blades may need cleaning or cobwebs in the flue inlet tube or possibly air pressure switch

john
February 2012
Is fan running or air pressure switch

ltd
February 2012

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