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Mend Vaillant Sine 18 Boiler Repair

how can i fix my vaillant sine 18 boiler?

there is a 0.315 amp fuse blowing on the left hand pcb and i can't work out whats causing it! i spent 20 minutes on the vaillant premium rate hotline(60p a minute!) without any reply so was wondering if anyone might have an answer?

peter plumber
March 2011

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