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The only thumb vent near the cylinder is not on the circuit that goes through the coil of the tank. Any other suggestions would be most welcome.

Having refilled the heating system and bled all the radiators succesfully, I do not have any hot water, which leads me to think that there must be an air lock in the coil circuit in the hot water tank. The boiler I have is a Worcester Danesmoor 15/19, with two connections in the top and two in...