I did the expansion tank trick today and the short burst of hot air is even hotter than before but still only seconds worth, so no air in it now as far as i know, i then took apart the heater controls and all the cables are working fine there i am going to disconnect the hoses to the bulk head tommorow and stick the hose pipe down them as we used to on the mini's and hope it may clear any blockages that are stopping the water getting to the matrix, i will keep you updated... let me know if you have any other ideas thanks guys.
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