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

Typical repair cost for the Grant Grant Fault fault is £120-£350 including labour.

Grant Fault High

Grant Grant Fault Fault Code

Q: What does the Grant Grant Fault fault code mean?

Your boiler has detected a general processing error or a mismatch in the ignition sequence that is preventing it from heating your home.

Also written as GRANTFAULT — same fault.

The Grant Grant Fault fault code means: your boiler has detected a general processing error or a mismatch in the ignition sequence that is preventing it from heating your home.. It appears on 1 Grant model in our database.

Technical description: Fault Description

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that you have a sufficient supply of heating oil in your tank.Ensure the oil supply valve is fully open.Press the illuminated reset button on the burner once and wait for the restart sequence.

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Grant models that show the Grant Fault fault code

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

Vortex Blue Repair: £120-£350

Source

Grant Grant Fault 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