88:0 Low

Viessmann 88:0 Fault Code

Also written as 880 — same fault.

The Viessmann 88:0 fault code means: your boiler is operating normally, but the display settings have been changed or reset to show temperatures in celsius.. It appears on 5 Viessmann models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Temperature display in °Celsius

What causes the Viessmann 88:0 fault?

This code appears when the boiler's internal settings have been adjusted to display temperatures in Celsius rather than Fahrenheit. It typically occurs after a manual setting change in the menu or following a system reset that reverted the display to its factory default unit of measurement.

DIY fix possible

Navigate to the display settings menuSelect the temperature unit optionConfirm your preferred unit (°C or °F) to clear the status message

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Viessmann models that show the 88:0 fault code

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

Source

Viessmann 88:0 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