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07 is just part of the GC number - I thought it may help! Thanks for your help Dave, I will get it replaced and see how we get on! Liz

Our Halstead boiler keeps cutting out and switching itself back on when you run the hot water making the hot water alternate between hot and cold (not fun when you are in the shower!). We have already had a plumber out who said it was the solenoid, so we bought a new gas valve but this did not...