AL 44 High

Sime AL 44 Fault Code

Also written as AL44 — same fault.

The Sime AL 44 fault code means: your boiler has failed to ignite and cannot detect a flame, which means your heating and hot water will not work until a faulty internal component is replaced.. It appears on 7 Sime 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: Anomaly inside electronic board / gas valve timeout without flame — check gas valve and PCB; contact Technical Assistance
Typical repair cost £250-£550 (including labour)

Engineer required

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

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Sime models that show the AL 44 fault code

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

Source

Sime AL 44 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026