240 High

Worcester Bosch 240 Fault Code

The Worcester Bosch 240 fault code means: your boiler has lost the signal from one of its internal temperature sensors, meaning it cannot correctly measure the heat of the water and has stopped running to stay safe.. It appears on 5 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: Interruption of the NTC cabling

What causes the Worcester Bosch 240 fault?

Sensor connection fault

Typical repair cost £120-200 (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 240 fault code

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

Source

Worcester Bosch 240 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 7 July 2026