How much does it cost to fix Keston error code E03-894?

Typical repair cost for the Keston E03-894 fault is £150-300 including labour.

E03-894 Emergency

Keston E03-894 Fault Code

Q: What does the Keston E03-894 fault code mean?

Your boiler is struggling to get the right balance of air and gas to burn safely, which is often caused by the wrong internal setting or part being installed for the type of gas you are using.

Also written as E03894 — same fault.

The Keston E03-894 fault code means: your boiler is struggling to get the right balance of air and gas to burn safely, which is often caused by the wrong internal setting or part being installed for the type of gas you are using.. It appears on 2 Keston models in our database.

Technical description: Air Orifice - LPG

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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Keston models that show the E03-894 fault code

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

Source

Keston E03-894 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