BoilerFaultCodesWorcester Bosch 1068 Fault Code
The Worcester Bosch 1068 fault code means: your boiler's internal sensor system is confused about the air quality or external temperature, which may hinder its efficiency or ability to run.. It appears on 5 Worcester Bosch models in our database.
Technical description: Outside temp. sensor or lambda probe faulty.
What causes the Worcester Bosch 1068 fault?
This fault occurs when the boiler's internal computer receives conflicting or missing data from its environmental sensors. It most commonly happens because the lambda sensor, which monitors the exhaust gases, has failed or the wiring connecting the external temperature sensor has become damaged or loose.
This fault is more frequently reported during the first cold snap of autumn, as the boiler attempts to communicate with the outside temperature sensor after months of inactivity.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the 1068 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 1068 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