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No not been yet, phoned to say he was very busy do his best for Monday. He said to turn thermostat for pump right down to see if pump would come on but it didn't. Don't want to put wood burner on when hot water can't get away. How can we clear if it is air locked? There is a pump at the oil boiler and one under hot tank near the neutraliser. And yes there is a lot of pipe runs and bends in the cupboard housing the hot water tank. Thanks the builder for replying to me.