BoilerFaultCodesWorcester Bosch 218 Fault Code
The Worcester Bosch 218 fault code means: your boiler has likely experienced a glitch or internal hardware communication error within its main computer system.. It appears on 1 Worcester Bosch model in our database.
Technical description: Three figure number example (Internal error)
What causes the Worcester Bosch 218 fault?
This fault occurs when the boiler's main control board experiences a data processing failure or loses connection with internal sensors. It is typically caused by a genuine electronic failure within the computer chip or electrical interference disrupting the signal between components. While a simple reset may temporarily clear it, the code usually indicates that the internal hardware has reached the end of its reliable lifespan.
DIY fix possible
Locate the main power switch for the boiler and turn it off.Wait for approximately 30 seconds.Turn the power back on and press the 'Reset' button on the boiler fascia for 3 to 5 seconds.
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Gas Safe Register →Worcester Bosch models that show the 218 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 218 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