BoilerFaultCodesWorcester Bosch 270 Fault Code
The Worcester Bosch 270 fault code means: your boiler is noting that the temperature is rising too quickly during its normal operation, which often suggests the water isn't moving through the system fast enough.. It appears on 12 Worcester Bosch models in our database.
Technical description: The boiler is modulating upwards
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barBleed any air from the radiatorsPress the reset button once the system has cooled
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Worcester Bosch models that show the 270 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 270 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 24/28/35 CDi MkII manual (PDF)
- Worcester Bosch Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 12i System manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026