vaillant f23

  1. F

    Vaillant ecotec plus 831- F75 followed by F23

    Hi all, I'm a user of a 831 (it's been fitted in 2010) and started having issues with it recently. I'm not qualified in boiler repair but have done a few days' research and this is what happens with mine: Started by throwing an F75 now and again but worked fine after a reset. When they became...
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