07, 09 High

Viessmann 07, 09 Fault Code

Also written as 0709 — same fault.

The Viessmann 07, 09 fault code means: your boiler has detected a problem with the burner and has shut itself down as a safety precaution, meaning you will not have any heating or hot water.. It appears on 1 Viessmann model in our database.

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: Burner control switches to lockout
Typical repair cost £120-450 (including labour)

DIY fix possible

Check that you have not run out of heating oil in your storage tankEnsure the oil shut-off valve is fully openPress the reset button on the burner control unit once to see if the boiler restarts

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Viessmann models that show the 07, 09 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Viessmann 07, 09 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026