How much does it cost to fix Heatline error code E02?

Typical repair cost for the Heatline E02 fault is £120-300 including labour.

E02 High

Heatline E02 Fault Code

Q: What does the Heatline E02 fault code mean?

Your boiler has switched itself off because the water inside has become too hot, usually caused by a blockage or a pump that isn't circulating water correctly.

The Heatline E02 fault code means: your boiler has switched itself off because the water inside has become too hot, usually caused by a blockage or a pump that isn't circulating water correctly.. It appears on 7 Heatline models in our database.

Technical description: Overheat fault: The safety thermostat has operated due to high water temperature. Check pump operation and system flow.

Typical repair cost £120-300 (including labour)

DIY fix possible

Check that all radiator valves are fully open to ensure water can flow.Ensure the boiler pressure is between 1 and 1.5 bar on the pressure gauge.Once the boiler has cooled down, attempt to reset it by turning the dial to 'Reset' for a few seconds.

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Heatline models that show the E02 fault code

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

Source

Heatline E02 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026