How much does it cost to fix Grant error code Red neon (on panel)?

Typical repair cost for the Grant Red neon (on panel) fault is £120-250 including labour.

Red neon (on panel) High

Grant Red neon (on panel) Fault Code

Q: What does the Grant Red neon (on panel) fault code mean?

Your boiler has become too hot and has automatically turned itself off as a safety precaution to prevent damage.

Also written as REDNEONONPANEL — same fault.

The Grant Red neon (on panel) fault code means: your boiler has become too hot and has automatically turned itself off as a safety precaution to prevent damage.. It appears on 3 Grant models in our database.

Technical description: Overheat thermostat has operated

Typical repair cost £120-250 (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 (on panel) fault code

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

Source

Grant Red neon (on panel) 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