BoilerFaultCodesWorcester Bosch 2952 Fault Code
The Worcester Bosch 2952 fault code means: your boiler has detected an internal error while trying to check if the flame is burning safely, causing the system to shut down for safety.. It appears on 8 Worcester Bosch models in our database.
Technical description: Internal fault when testing the ionisation signal
What causes the Worcester Bosch 2952 fault?
This fault occurs when the boiler's internal computer fails to properly monitor the electrical signal produced by the flame. The most common reason is a build-up of carbon on the sensing probe or a loose connection in the wiring that prevents the system from confirming the boiler is burning gas safely. In some cases, it can also be triggered by a glitch in the main circuit board itself.
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 2952 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2952 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