ariston microgenus combo 23 mffi goes out

[fletch]

Hi all, I just been working on a ariston microgenus23 mffi combi and the problem is that it fires up and its cool and as soon as u turn on the hot tap it diverts to hot water and when you turn the tap off the boiler goes out then it go through the firing up sequence and sometimes it goes out and doesn't fire at all. I checked the burner pressure on firing up and it went up to 4mb and the inlet pressure was 22mb I'm sure it's the gas valve but I don't want to waste the customer money if I'm wrong.so if anyone has come across this I would appreciate your view

 

[Dotty]

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