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 10 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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the 1068 fault code
Click a model for the full fault code list and model-specific repair notes.
- 1000 Repair: £120-200
- Greenstar 2000 Repair: £150-250
- Greenstar 27CDi Repair: £150-250
- Greenstar 28CDi Repair: £150-250
- Greenstar 4000 Repair: £150-250
- Greenstar 8000 Repair: £150-250
- Greenstar 8000 Life Repair: £120-200
- Greenstar 8000 Life System Repair: £120-220
- Greenstar 8000 Life/Style Repair: £140-280
- Greenstar 8000 Style Repair: £150-250
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.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026