High
Lock-out state on Biasi Riva Advance M96.24SM

Your boiler has attempted to light itself four times without success and has turned itself off for safety.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

The electronic control/ignition p.c.b. carries out four complete ignition cycles and then goes to lock-out state (e.g., if gas supply is interrupted).

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Safety thermostat lockoutView →

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