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

Typical repair cost for the Heatline OC fault is £0 including labour.

OC Low

Heatline OC Fault Code

Q: What does the Heatline OC fault code mean?

Your boiler has detected an outdoor temperature sensor and has automatically turned on a feature that adjusts your heating based on the weather outside.

The Heatline OC fault code means: your boiler has detected an outdoor temperature sensor and has automatically turned on a feature that adjusts your heating based on the weather outside.. It appears on 6 Heatline models in our database.

Technical description: External sensor is connected and OTC enabled

Typical repair cost £0 (including labour)

DIY fix possible

Check if your heating is still working as expectedRefer to the manual if you wish to adjust the weather compensation settingsNo action is required if the heating is comfortable, as this is an status indicator rather than a breakdown

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Heatline models that show the OC fault code

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

Source

Heatline OC 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