How much does it cost to fix Heatline error code F65?

Typical repair cost for the Heatline F65 fault is £200-400 including labour.

F65 High

Heatline F65 Fault Code

Q: What does the Heatline F65 fault code mean?

Your boiler has detected that its internal computer has become dangerously hot and has shut itself down to prevent fire or electrical damage.

The Heatline F65 fault code means: your boiler has detected that its internal computer has become dangerously hot and has shut itself down to prevent fire or electrical damage.. It appears on 8 Heatline models in our database.

Technical description: Excessive main board temperature

Typical repair cost £200-400 (including labour)

Engineer required

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

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Heatline models that show the F65 fault code

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

Capriz Plus Repair: £200-400
Centurion 25 Repair: £200-400
Compact 24 Repair: £200-400
Compact 30 Repair: £200-400
Monza Repair: £150-300
Solaris Repair: £200-400
Vizo 24 Repair: £200-400
Vizo 28 Repair: £200-400

Source

Heatline F65 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.

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