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Can any of you guys help with this one? Also can I just fit a head replacement for the pump instead of buying a complete pump assembly.. Any advice appreciated..

Hi, Got a problem with an ecomax 824 showing F23 code.. CH not circulating properly even though system pressure is ok and all rads vented.. HW cutting from Hot to Cold.. Suspect sluggish pump as Heating circuit not circulating correctly.. Pump is running though.. Display shows...