BoilerFaultCodes.com
2 High Lockout

Your boiler is failing to light the burner though it is trying to start up.

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: Boiler in ignition mode

What causes this fault?

This fault occurs when the boiler attempts to start up but cannot successfully establish a flame after several attempts. The most common reasons are a lack of gas reaching the burner, a build-up of soot on the ignition sensors, or a failure in the electrical component that generates the spark.

This issue is more frequent during the first cold snap of autumn when boilers are switched back on after being idle for several months, often revealing sticking gas valves or worn electrodes.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your gas prepayment meter has credit (if applicable)Ensure other gas appliances in your home, like a hob, are working correctlyPress the reset button once to see if the boiler restarts

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