Vaillant 418 open vent - switching CH on after power cut

  • Thread starter Elektra99
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Vaillant 418 open vent - switching CH on after power cut

Vaillant 418 open vent - switching CH on after power cut

I think this problem has been there since first install, the service engineer, yesterday, said the boiler wasnt working correctly and I needed to get vaillant out to fix it. It is 12 months old and under warranty. I have no faith in the orginal installers competence - long story.

If mains power to the boiler is cut and restored the HW side works as it should but the CH wont come on. The only way to fix it is to cut the power and as soon as the radiator sign appears in the display presss...

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by Elektra99

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