How much does it cost to fix Keston error code E 28?

Typical repair cost for the Keston E 28 fault is £250-450 including labour.

E 28 High

Keston E 28 Fault Code

Q: What does the Keston E 28 fault code mean?

Your boiler has stopped working because the internal component responsible for pushing combustion gases out of the flue cannot turn.

Also written as E28 — same fault.

The Keston E 28 fault code means: your boiler has stopped working because the internal component responsible for pushing combustion gases out of the flue cannot turn.. It appears on 3 Keston models in our database.

Technical description: Fan not rotating - check fan connection and fan for fault.

Typical repair cost £250-450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Keston models that show the E 28 fault code

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

Source

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

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