How much does it cost to fix Grant error code Boiler Fault Finding 5?

Typical repair cost for the Grant Boiler Fault Finding 5 fault is £150-350 including labour.

Boiler Fault Finding 5 Emergency

Grant Boiler Fault Finding 5 Fault Code

Q: What does the Grant Boiler Fault Finding 5 fault code mean?

Your boiler is not burning fuel correctly and is producing smoke, which indicates a serious safety issue that requires professional attention immediately.

Also written as BOILERFAULTFINDING5 — same fault.

The Grant Boiler Fault Finding 5 fault code means: your boiler is not burning fuel correctly and is producing smoke, which indicates a serious safety issue that requires professional attention immediately.. It appears on 5 Grant models in our database.

Technical description: Visible smoke from flue or high smoke number. Insufficient air supply – check the air damper setting and the condition of the fan.

Typical repair cost £150-350 (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 5 fault code

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

Source

Grant Boiler Fault Finding 5 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