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Thanks for your reply ptp. The B24 is the same as the Visio 24 except it has no internal time programmer. These symptoms do not produce any fault indication, as boiler is functioning OK, just operating below efficiency. Boiler was good value for money and no problems up till now (4yrs).

Boiler has been gradually condensing less and less, now not a drop, have checked the drain from the condensing unit heat exchanger sump and all is clear. (Flow temp well below 50 DegreesC) Must be a problem with the hex unit, but what can possibly go wrong inside there? Anybody got knowlege of...