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

Typical repair cost for the Heatline Err fault is £150-300 including labour.

Err High

Heatline Err Fault Code

Q: What does the Heatline Err fault code mean?

Your boiler's electronic display panel is failing to communicate with the internal system, which means the boiler cannot operate or respond to your commands.

Also written as ERR — same fault.

The Heatline Err fault code means: your boiler's electronic display panel is failing to communicate with the internal system, which means the boiler cannot operate or respond to your commands.. It appears on 8 Heatline models in our database.

Technical description: User interface fault: Defective user interface

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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Heatline models that show the Err fault code

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

Source

Heatline Err 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