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Thank you replying and you are correct it is a Saunier Duval boiler, what I mean by switched off is that when we get back to the house the boiler seems to have a fail safe device which inhibits the entry of gaz (this is not a mains gas area and we have to use Totalgaz). We have to switch off...

I have an ISOSPLIT condens F24/30 boilers which has performed brilliantly since installation 5 years ago. However a quirk has developed that the system maintainer in France cannot fathom. When we leave the house in the winter we switch off the cold water supply outside of the house to avoid...