How much does it cost to fix Viessmann error code 59:1 to 59:10?

Typical repair cost for the Viessmann 59:1 to 59:10 fault is £90-180 including labour.

59:1 to 59:10 Low

Viessmann 59:1 to 59:10 Fault Code

Q: What does the Viessmann 59:1 to 59:10 fault code mean?

Your boiler is notifying you of an adjustable temperature setting related to the DHW cylinder pump, which is usually a configuration advisory rather than a mechanical failure.

Also written as 591TO5910 — same fault.

The Viessmann 59:1 to 59:10 fault code means: your boiler is notifying you of an adjustable temperature setting related to the dhw cylinder pump, which is usually a configuration advisory rather than a mechanical failure.. It appears on 5 Viessmann models in our database.

Technical description: Starting point adjustable from 1 to 10K below the set value

What causes the Viessmann 59:1 to 59:10 fault?

This fault occurs when the boiler's control system identifies a mismatch in its internal operational settings, specifically regarding the temperature drop allowed before it fires up again. It is typically caused by a minor electronic glitch within the main control board or a slight calibration error in the temperature sensors. While the boiler continues to function, it is highlighting that its internal logic for managing heat cycles is slightly out of sync.

Typical repair cost £90-180 (including labour)

DIY fix possible

Press the 'Reset' button on the control panelTurn the boiler off and back on at the fused spur switchMonitor the display to see if the code clears after a restart

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Viessmann models that show the 59:1 to 59:10 fault code

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

Source

Viessmann 59:1 to 59:10 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 27 April 2026