Off (No light) High

Worcester Bosch Off (No light) Fault Code

Also written as OFFNOLIGHT — same fault.

The Worcester Bosch Off (No light) fault code means: your boiler is not receiving electrical power or does not realise you are asking for heating or hot water.. It appears on 2 Worcester Bosch models in our database.

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: No demand for heat or appliance is powered off
Typical repair cost £80-250 (including labour)

DIY fix possible

Check if the boiler's power switch is turned onCheck your home's consumer unit (fuse box) to see if a circuit has trippedEnsure your thermostat is turned up and has working batteriesCheck if the external timer or programmer is set to 'On'

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Worcester Bosch models that show the Off (No light) fault code

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

Source

Worcester Bosch Off (No light) 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