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Mend Valiant combi boiler Boiler Heating Combi

how can i fix my valiant combi boiler?

when my heating is set on a timer for the morning it turns its self on but when i go to use the hot water first thing it turns the boiler off and will not re start for about 10 minutes later. it will give hot water but no heating for this time.

EMYR ADAMS
October 2008
ValiantValiant combi boilerHeating, Home Heating SystemsBoiler Heating Combi
which vaillant cmbi is it? if its vcw 242e then you have problem with yous servo valve or micro pipes to servo valves are blockrd.

universal heating ltd
October 2008

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Valiant Combi Boiler: Hot Water & Heating Issues