How much does it cost to fix Grant error code Boiler Fault Finding 4?

Typical repair cost for the Grant Boiler Fault Finding 4 fault is £150-350 including labour.

Boiler Fault Finding 4 High

Grant Boiler Fault Finding 4 Fault Code

Q: What does the Grant Boiler Fault Finding 4 fault code mean?

Your boiler is struggling to keep its flame lit after it starts up, causing it to shut down for safety reasons.

Also written as BOILERFAULTFINDING4 — same fault.

The Grant Boiler Fault Finding 4 fault code means: your boiler is struggling to keep its flame lit after it starts up, causing it to shut down for safety reasons.. It appears on 5 Grant models in our database.

Technical description: Burner lights but goes to ‘lock-out’. If the flame is unstable, check the combustion settings.

Typical repair cost £150-350 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Grant models that show the Boiler Fault Finding 4 fault code

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

Source

Grant Boiler Fault Finding 4 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