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Mend Vaillant Boiler Heating Blocked

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hi my boiler has stopped working and is showing F23 which appears to indicate that a rubbers hose may be blocked. I have located the rubber hose but I was woundering what is the easiest way to drain the system and then fill back up.

kab
December 2010
VaillantHeating, Home Heating SystemsBoiler Heating Blocked

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