BoilerFaultCodesWorcester Bosch F0238 Fault Code
The Worcester Bosch F0238 fault code means: your boiler's internal computer memory chip has developed a fault, preventing the system from identifying itself and operating safely.. It appears on 2 Worcester Bosch models in our database.
Technical description: The burner control unit KIM (boiler identification module) is faulty
What causes the Worcester Bosch F0238 fault?
This fault occurs when the boiler's main computer loses communication with its internal identity chip, which stores the specific settings for your model. The most common reason is an electrical failure within the plug-in memory module or a malfunction on the main circuit board that prevents it from reading the necessary data. Without this connection, the boiler shuts down because it no longer knows its own safety limits or operating parameters.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the F0238 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch F0238 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