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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
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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