How much does it cost to fix Potterton error code Error 28?

Typical repair cost for the Potterton Error 28 fault is £150-250 including labour.

Error 28 High

Potterton Error 28 Fault Code

Q: What does the Potterton Error 28 fault code mean?

Your boiler has stopped working because it is unable to accurately measure the temperature of the gases leaving the unit, leading the system to shut down for safety.

Also written as ERROR28 — same fault.

The Potterton Error 28 fault code means: your boiler has stopped working because it is unable to accurately measure the temperature of the gases leaving the unit, leading the system to shut down for safety.. It appears on 2 Potterton models in our database.

Technical description: Temperature sensors faulty (Flue sensor)

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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Potterton models that show the Error 28 fault code

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

Source

Potterton Error 28 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

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