error code 23 is probably caused by blocked rubber return pipe to primary heat exchanger. (4-5 inch pipe to be cut off with hacksaw and refitted using jubilee clips included in kit) symptons : hot/cold water in taps fluctuating before error code appears.
Hope this helps - solved mine.
Check this link : http://www.ukplumbersforums.co.uk/c...llant-ecomax-622-2e-fault-f-23-a.html[/QUOTE]
Not realy as this post is over a year old