How much does it cost to fix Viessmann error code 50:0?

Typical repair cost for the Viessmann 50:0 fault is £120-350 including labour.

50:0 Medium

Viessmann 50:0 Fault Code

Q: What does the Viessmann 50:0 fault code mean?

Your boiler has failed to recognize its current control screen or operating interface and is trying to switch to an alternative control method.

Also written as 500 — same fault.

The Viessmann 50:0 fault code means: your boiler has failed to recognize its current control screen or operating interface and is trying to switch to an alternative control method.. It appears on 5 Viessmann models in our database.

Technical description: Alternative control (automatic adjustment upon recognition of the operating interface)

What causes the Viessmann 50:0 fault?

This fault occurs when the boiler's internal computer brain loses its connection with the display screen on the front of the unit. The most common reason is a loose or damaged data cable connecting the two parts, or an electronic failure within the display module itself. Because the components can no longer 'talk' to each other, the boiler stops working as a safety precaution.

Typical repair cost £120-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

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

Gas Safe Register →

Viessmann models that show the 50:0 fault code

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

Source

Viessmann 50:0 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