How much does it cost to fix Vokera error code 78˚C?

Typical repair cost for the Vokera 78˚C fault is £120-250 including labour.

78˚C High

Vokera 78˚C Fault Code

Q: What does the Vokera 78˚C fault code mean?

Your boiler has detected that the water inside it is getting dangerously hot and has shut itself down to prevent damage or overheating.

Also written as 78C — same fault.

The Vokera 78˚C fault code means: your boiler has detected that the water inside it is getting dangerously hot and has shut itself down to prevent damage or overheating.. It appears on 3 Vokera models in our database.

Technical description: Flow temperature NTC > 78˚C (Boiler at lock out)

Typical repair cost £120-250 (including labour)

Engineer required

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

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Vokera models that show the 78˚C fault code

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

Source

Vokera 78˚C fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026