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Howard
Lemme guess. CO / all gas sensor - error code F55?
Apparently they’re much more complicated to commission and set up properly. FWIW an engineer eventually worked out that the flue fan power wasn’t high enough so the condensed water was running back into the boiler and tripping the sensor. TBF we do have a slightly convoluted flue run, but it took months for someone to work this out, all the other guys just changed various parts at random.