How much does it cost to fix Grant error code Red blinking light?

Typical repair cost for the Grant Red blinking light fault is £120-280 including labour.

Red blinking light High

Grant Red blinking light Fault Code

Q: What does the Grant Red blinking light fault code mean?

Your boiler's safety sensor thinks there is a fire inside before it has even started, causing the system to shut down for safety.

Also written as REDBLINKINGLIGHT — same fault.

The Grant Red blinking light fault code means: your boiler's safety sensor thinks there is a fire inside before it has even started, causing the system to shut down for safety.. It appears on 1 Grant model in our database.

Technical description: Presence of a false flame signal before heat request

What causes the Grant Red blinking light fault?

This fault occurs when the boiler's internal sensor detects light or a signal that looks like a fire before the burner has actually started. This is usually caused by a dirty sensor lens, a faulty control box, or a leaking fuel valve that is letting a small amount of oil onto the burner head.

Typical repair cost £120-280 (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 Red blinking light fault code

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

Vortex Blue Repair: £120-280

Source

Grant Red blinking light 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