BoilerFaultCodesWorcester Bosch 2955 Fault Code
The Worcester Bosch 2955 fault code means: your boiler’s internal computer has been given instructions that it doesn't recognize or that don't match how the unit is physically built.. It appears on 7 Worcester Bosch models in our database.
Technical description: Boiler does not support the parameters set for the hydraulic configuration
What causes the Worcester Bosch 2955 fault?
This fault occurs when the boiler's control board is programmed with settings that do not match its physical internal components, specifically regarding how water flows through the unit. It typically happens after a major repair or a software update where the incorrect 'code plug' or configuration profile has been selected by a technician. Essentially, the boiler has become confused and has shut down as a safety precaution because it doesn't know how to operate its pumps or valves correctly.
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 2955 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2955 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