ALL07 High

Sime ALL07 Fault Code

The Sime ALL07 fault code means: your boiler has experienced an ignition failure and cannot start up to provide heat or hot water.. It appears on 1 Sime model 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: Press the key of the controls (2) to re-start the boiler, if the error persists seek help and advice from a qualified engineer.
Typical repair cost £100-280 (including labour)

DIY fix possible

Check that your gas pre-pay meter has credit (if applicable).Ensure other gas appliances in your home, like a hob, are working correctly.Press the Reset button (control key 2) on the boiler panel to attempt a restart.

Find a Gas Safe engineer

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Sime models that show the ALL07 fault code

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

Source

Sime ALL07 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