How much does it cost to fix Grant error code RED fast blinking?

Typical repair cost for the Grant RED fast blinking fault is £120-250 including labour.

RED fast blinking High

Grant RED fast blinking Fault Code

Q: What does the Grant RED fast blinking fault code mean?

Your boiler has stopped working because it failed to light the burner, meaning you currently have no heating or hot water.

Also written as REDFASTBLINKING — same fault.

The Grant RED fast blinking fault code means: your boiler has stopped working because it failed to light the burner, meaning you currently have no heating or hot water.. It appears on 5 Grant models in our database.

Technical description: Burner lockout (refer to Fault Diagnostics table)

Typical repair cost £120-250 (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 RED fast blinking fault code

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

Source

Grant RED fast blinking 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