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Mend Worcester Bosch RF1 Boiler Heating Error

how to start boiler?

hi i have a rf1 red light flashes all the time to call for heat but will not switch boiler on please help thanks

steve
September 2011
Worcester BoschWorcester Bosch RF1Heating, Home Heating SystemsBoiler Heating Error

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Worcester Bosch RF1 Boiler Not Starting - Help