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Vaillant igniting issue ( domestic ) not CH?

Hello to everyone,
I have a Vaillant sine 18 T-3 combi boiler that was installed in 1985. Have had parts replaced over the years but now my cover with British gas has ended i have found it will only ignite on CH demand, not when you use the hot water/shower taps. Was an intermittent fault at first. I have changed the flow switch but it's not that .
Any ideas or members with a similar problem then i'd be grateful to from you,
Allan

AllanC
March 2017
VaillantHeating, Home Heating SystemsVaillant Hello 18
Interesting, you say you have replaced the flow switch, this boiler doesn't have a domestic flow switch, the hot water is supplied by a diaphragm.

Ajk
May 2017

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