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

Typical repair cost for the Grant Red neon light fault is £150-300 including labour.

Red neon light High

Grant Red neon light Fault Code

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

Your boiler has detected that it is getting too hot and has automatically shut down for safety reasons.

Also written as REDNEONLIGHT — same fault.

The Grant Red neon light fault code means: your boiler has detected that it is getting too hot and has automatically shut down for safety reasons.. It appears on 1 Grant model in our database.

Technical description: The boiler should switch off on the overheat thermostat and the red neon light.

Typical repair cost £150-300 (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 neon light fault code

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

Vortex Combi 70 Repair: £150-300

Source

Grant Red neon 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