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. i have posted this item elsewhere on this forum but a customer of mine is having problems. the cold water tank is overflowing. after changing ball valve i was called back as tank was overflowing again. cold water tank is back filling from cold feed to hot cylinder. house has three mixer taps...

Hi. please advise me. i have drained the water from the heating side to change some radiators. i noticed water was black so i filled it back up and the water became clearer so i repeated 4 or 5 times. but now when i turn on heating water discharges from the vent in feed and expansion tank. can...