BoilerFaultCodesWorcester Bosch 2908 Fault Code
The Worcester Bosch 2908 fault code means: your boiler's internal computer has encountered a communication error or internal electronic glitch that is preventing it from working correctly.. It appears on 5 Worcester Bosch models in our database.
Technical description: System fault boiler electronics / basic controller
What causes the Worcester Bosch 2908 fault?
This fault occurs when the boiler's main control board experiences a breakdown in communication with other internal electronic components. It is typically caused by a physical failure within the Printed Circuit Board's circuitry or a loose connection in the wiring harness that links the sensors to the main computer. Essentially, the boiler has lost its ability to send and receive the vital data signals needed to operate safely.
DIY fix possible
Press the Reset button on the front of the boiler display.If the code persists, turn the main power supply to the boiler off at the fused spur switch, wait 30 seconds, and turn it back on.If the code returns immediately, you will need to book a Gas Safe registered engineer.
Find a Gas Safe engineer
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A cover plan would handle faults like 2908: no call-out fees, no surprise bills.
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Worcester Bosch models that show the 2908 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2908 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