A code on its own works too — try F.28, EA, or E133.
Symptom wizard Request a missing brand Faults and fixes
Results come from the MyBoiler.com tables on this site. They deep-link to the brand page, or to an individual Vaillant code guide when we have one.
Browse brands A–Z
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Full-colour names open tables or PDFs we host on MyBoiler.com. Grey names are not listed yet.