131 Low

Worcester Bosch 131 Fault Code

The Worcester Bosch 131 fault code means: your boiler has detected a new smart control or accessory and is currently struggling to communicate with it, meaning it needs help to recognize the new connection.. It appears on 1 Worcester Bosch model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Fault 11 System configuration: new BUS device: New ISM detected
Typical repair cost £0-£120 (including labour)

DIY fix possible

Switch the boiler off at the mains power supplyWait for at least 60 seconds to allow the internal memory to resetSwitch the power back on and wait for the boiler to automatically re-scan for connected devices

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Worcester Bosch models that show the 131 fault code

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

Source

Worcester Bosch 131 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