BoilerFaultCodes.com
L2 High Lockout

Your boiler has failed to ignite properly and has locked itself out for safety.

Call an engineer soon

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

Technical description: Led alarm (blink red)

What causes this fault?

This fault occurs when the boiler attempts to light the burner but fails to detect a stable flame. The most common reasons are a worn-out ignition electrode that cannot create a spark, a faulty gas valve preventing fuel from entering the burner, or a problem with the internal control board.

This fault can be more frequent during the first cold snap of winter when components that have sat idle all summer are suddenly forced to operate under high demand.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check if your gas supply is turned on at the meterTurn the mode selector switch to the 'OFF/RESET' position and wait for a few secondsTurn the switch back to the 'ON' position to restart the ignition process

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