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I have a problem with this boiler. Just changed PCB and boiler fires up now but only on central heating. On hot water is death and switching code AL 04. I tried many times set it up like instruction sais, but still the same. Any clues? Many thanks

Im gas safe engineer and have a problem with Vokera procombi 85he. Boiler doesn't fire up( at hot water tap open or central heating on), fan working, no fault displayed. When I open combustion chamber or pull the flue elbow up can hear air switch click and boiler runs. What it could be? Fan...