BoilerBuddy · fault code lookup
Viessmann fault codes — in plain English.
Enter the code shown on your boiler display to find published, verified guidance for the matching model range. If a code appears in more than one range, choose yours to open the right record.
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Range-aware lookup
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Look up a fault code
Enter the code as it appears on your Viessmann boiler display. We show published, verified entries for the matching range.