BoilerFaultCodesWorcester Bosch 2 flashes Fault Code
Also written as 2FLASHES — same fault.
The Worcester Bosch 2 flashes fault code means: your boiler is struggling to circulate water because there isn't enough pressure or there is air trapped in the system.. It appears on 2 Worcester Bosch models in our database.
Technical description: Pump has run dry.
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling link underneath the boiler to top it up.Bleed your radiators to remove any trapped air that might be blocking water flow.Reset the boiler by holding the reset button for 3 to 5 seconds.
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Worcester Bosch models that show the 2 flashes fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2 flashes 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 31 August 2026