How much does it cost to fix Grant error code Boiler Fault Finding 9?

Typical repair cost for the Grant Boiler Fault Finding 9 fault is £150-300 including labour.

Boiler Fault Finding 9 High

Grant Boiler Fault Finding 9 Fault Code

Q: What does the Grant Boiler Fault Finding 9 fault code mean?

Your boiler has detected that it is becoming dangerously hot and has shut itself down to prevent damage, likely because water is not flowing through the system properly.

Also written as BOILERFAULTFINDING9 — same fault.

The Grant Boiler Fault Finding 9 fault code means: your boiler has detected that it is becoming dangerously hot and has shut itself down to prevent damage, likely because water is not flowing through the system properly.. It appears on 5 Grant models in our database.

Technical description: Boiler operating on overheat thermostat. Faulty boiler thermostat. No circulation, check circulating pump. Check for air lock.

Typical repair cost £150-300 (including labour)

Engineer required

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

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Grant models that show the Boiler Fault Finding 9 fault code

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

Source

Grant Boiler Fault Finding 9 fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.

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