How much does it cost to fix Heatline error code F03?

Typical repair cost for the Heatline F03 fault is £100-280 including labour.

F03 High

Heatline F03 Fault Code

Q: What does the Heatline F03 fault code mean?

Your boiler has tried to light several times but has failed to detect a flame, causing the unit to shut down for safety.

The Heatline F03 fault code means: your boiler has tried to light several times but has failed to detect a flame, causing the unit to shut down for safety.. It appears on 2 Heatline models in our database.

Technical description: Ignition safety time exceeded

Typical repair cost £100-280 (including labour)

DIY fix possible

Check that your gas emergency control valve is open and you have credit on your gas meterCheck if other gas appliances in your home, such as a hob, are working correctlyReset the boiler by turning the control knob to the 'Reset' position for five seconds

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Heatline models that show the F03 fault code

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

Source

Heatline F03 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