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diamondgas
What was the pump like when you took it out, full of anything? hard water area? If you're getting neither hot water or heating and it's cutting out on o/heat then there's no circulation going on even within the boiler! The aav is working correctly yeh? I've had a few isar's lock up constantly because the boiler's full of air and the aav isn't working? Just a thought mate 🙂