High Lockout
E00-741 on Worcester Bosch 24/28CDi II RSF

Your boiler has detected an issue with the internal burner assembly components, likely related to the incorrect gas injection setup for your fuel type.

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

Burner Injector – Propane Stereomatic, Type 7, 2.78mm dia.

What causes this fault?

This fault happens when the boiler identifies that the internal components used to burn gas do not match the specific type of fuel being supplied to your home. It typically occurs if the wrong parts were installed during a repair or if the settings were incorrectly adjusted, preventing the unit from creating a safe and efficient flame. The boiler shuts down as a safety precaution because using the wrong injectors can cause the burner to overheat or flicker dangerously.

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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