How much does it cost to fix Grant error code Boiler Fault Finding 8?

Typical repair cost for the Grant Boiler Fault Finding 8 fault is £150-300 including labour.

Boiler Fault Finding 8 High

Grant Boiler Fault Finding 8 Fault Code

Q: What does the Grant Boiler Fault Finding 8 fault code mean?

Your boiler is failing to get hot enough because it is not receiving the correct amount of fuel or is set up incorrectly, meaning it cannot provide you with heating or hot water.

Also written as BOILERFAULTFINDING8 — same fault.

The Grant Boiler Fault Finding 8 fault code means: your boiler is failing to get hot enough because it is not receiving the correct amount of fuel or is set up incorrectly, meaning it cannot provide you with heating or hot water.. It appears on 5 Grant models in our database.

Technical description: Water temperature low. Undersize nozzle and/or low fuel pressure. Check boiler thermostat and combustion settings.

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 8 fault code

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

Source

Grant Boiler Fault Finding 8 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