BoilerFaultCodesWorcester Bosch 252 Fault Code
The Worcester Bosch 252 fault code means: your boiler’s internal computer has encountered a communication error or an internal glitch and cannot operate until it is reset or repaired.. It appears on 5 Worcester Bosch models in our database.
Technical description: System fault boiler electronics / basic controller
What causes the Worcester Bosch 252 fault?
This fault occurs when the boiler’s main control board suffers a critical communication failure or an internal electronic crash. It is often caused by a sudden power surge, moisture getting onto the circuitry, or simply a hardware component reaching the end of its functional life. Because the central processor can no longer send or receive signals correctly, the system enters a fail-safe mode.
DIY fix possible
Locate the 'Reset' button on the boiler control panelPress and hold the button for 3 to 5 secondsWait for the boiler to restart and monitor if the code clears
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Worcester Bosch models that show the 252 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 252 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 2000 manual (PDF)
- Worcester Bosch Greenstar 27CDi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026