E03-888 High

Keston E03-888 Fault Code

Also written as E03888 — same fault.

The Keston E03-888 fault code means: your boiler has detected an incorrect settings or a hardware issue specifically related to how it processes liquid petroleum gas, meaning it cannot heat your home safely.. 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: Gas Injector - LPG
Typical repair cost £180-450 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Keston models that show the E03-888 fault code

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

Source

Keston E03-888 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