30 Low

Worcester Bosch 30 Fault Code

The Worcester Bosch 30 fault code means: your boiler is struggling to detect the outdoor temperature because the external sensor is either disconnected or faulty, but your heating and hot water should still work normally.. 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 15 Outside temperature sensor not connected: Outside temperature sensor not recognised
Typical repair cost £100-180 (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 30 fault code

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

Source

Worcester Bosch 30 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