BoilerFaultCodes.com
43 High Lockout

Your boiler has lost the signal that confirms a flame is burning, so it has shut down 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: Loss of flame rectification

What causes this fault?

This fault occurs when the boiler's control board can no longer detect the electrical signal that confirms a flame is present inside the burner. The most common reason is that the sensing probe has become coated in carbon deposits or has worn out, preventing it from 'seeing' the flame even if the boiler has actually ignited. In some cases, it can also be caused by an unstable gas supply or a moisture build-up on the electrical leads.

Typical repair cost £120-280 (including labour)

Engineer required

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

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