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dhw on my ariston eurocombi a/23 mffi gets too hot?

dhw control does not affect temp of water coming out of taps. ie if left to run water reaches max temp before boiler shuts down temporarily. then process repeats until tap is shut off.
mr c brewer, July 2008
could be the dhw thermister, the pcb potentiometer, or the dhw heat exchanger being crudded up

T, July 2008
link Click here to see other fixes for Ariston Eurocombi A/23 MFFI.