How much does it cost to fix Heatline error code F72?

Typical repair cost for the Heatline F72 fault is £150-250 including labour.

F72 High

Heatline F72 Fault Code

Q: What does the Heatline F72 fault code mean?

Your boiler has detected an unusual temperature gap between the outgoing and incoming water, indicating the system is struggling to circulate heat correctly.

The Heatline F72 fault code means: your boiler has detected an unusual temperature gap between the outgoing and incoming water, indicating the system is struggling to circulate heat correctly.. It appears on 8 Heatline models in our database.

Technical description: Permanent temperature difference between fl ow and return heating sensors

Typical repair cost £150-250 (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 F72 fault code

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

Source

Heatline F72 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