Top pipe should be the hot, so follow the pipes from the Aga to the cylinder, and make sure the top one from the aga goes to the top union on the cylinder, after that try boiling it , or when the boiler is running try drainning some water off , as it is trying to refill through the retuen pipe it might pull the hot water up the top pipe from the aga and start working.
erj
March 2010
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