Lockout light (constant) High

Worcester Bosch Lockout light (constant) Fault Code

Q: What does the Worcester Bosch Lockout light (constant) fault code mean?

Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage, while the pump keeps running to try and cool it back down.

Q: How much does it cost to fix Worcester Bosch error code Lockout light (constant)?

Typical repair cost for the Worcester Bosch Lockout light (constant) fault is £120-250 including labour.

Also written as LOCKOUTLIGHTCONSTANT — same fault.

The Worcester Bosch Lockout light (constant) fault code means: your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage, while the pump keeps running to try and cool it back down.. It appears on 2 Worcester Bosch models in our database.

Technical description: Boiler Overheat - Boiler overheat thermostat trip. Pump run continuously.

Typical repair cost £120-250 (including labour)

Engineer required

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

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Worcester Bosch models that show the Lockout light (constant) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch Lockout light (constant) fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026