E03-886 High

Keston E03-886 Fault Code

Also written as E03886 — same fault.

The Keston E03-886 fault code means: your boiler has failed to ignite or stay lit correctly, meaning it will not be able to provide heating or hot water until it is reset or repaired.. It appears on 2 Keston models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Burner
Typical repair cost £150-£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 E03-886 fault code

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

Source

Keston E03-886 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