High
F.XX on Vaillant ecoTEC Plus 610

Your boiler has detected a general internal error that is stopping it from working properly, and it now needs a professional diagnostic assessment to identify the specific cause.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

Fault codes (refer to the table in the appendix for advice)

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

F.20View →

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