LOCKOUT LIGHT ON (CONSTANTLY) High

Worcester Bosch LOCKOUT LIGHT ON (CONSTANTLY) Fault Code

Q: What does the Worcester Bosch LOCKOUT LIGHT ON (CONSTANTLY) fault code mean?

Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.

Q: How much does it cost to fix Worcester Bosch error code LOCKOUT LIGHT ON (CONSTANTLY)?

Typical repair cost for the Worcester Bosch LOCKOUT LIGHT ON (CONSTANTLY) fault is £120-250 including labour.

Also written as LOCKOUTLIGHTONCONSTANTLY — same fault.

The Worcester Bosch LOCKOUT LIGHT ON (CONSTANTLY) fault code means: your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.. It appears on 4 Worcester Bosch models in our database.

Technical description: FAULT POINT D. Boiler overheat. Possible causes: system not pressurised, air in system, bypass missing/incorrect, pump failure, sensor fault, or overheat thermostat tripped.

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 ON (CONSTANTLY) fault code

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

Source

Worcester Bosch LOCKOUT LIGHT ON (CONSTANTLY) 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