thank you very much for your reply suggesting that it may be a problem with the expansion tank. i would be grateful if you could give more information about this and perhaps include a link where i can download more information. could the problem be with the domestic hot water plate heat exchange unit. perhaps it is has started to break down and allowing water into the system. i would very grateful if you would respond to this email. many thanks anthony march.
ANTHONY MARCH
January 2014
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