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

Typical repair cost for the Grant Overheat fault is £150-300 including labour.

Overheat High

Grant Overheat Fault Code

Q: What does the Grant Overheat fault code mean?

Your boiler has automatically turned itself off because it has become too hot, which is a safety feature to prevent damage or dangerous conditions.

Also written as OVERHEAT — same fault.

The Grant Overheat fault code means: your boiler has automatically turned itself off because it has become too hot, which is a safety feature to prevent damage or dangerous conditions.. It appears on 8 Grant models in our database.

Technical description: The 'OVERHEAT' red indicator on the control panel will flash indicating that the overheat thermostat has operated. This will automatically switch off the boiler in the case of a control malfunction causing overheating.

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 Overheat fault code

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

Source

Grant Overheat 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