BoilerFaultCodesWorcester Bosch 1010 Fault Code
The Worcester Bosch 1010 fault code means: your boiler's internal computer system has lost communication with its external controls or smart thermostat, meaning it cannot receive instructions to turn on.. It appears on 5 Worcester Bosch models in our database.
Technical description: No communication via EMS BUS connection
What causes the Worcester Bosch 1010 fault?
This fault occurs when the link between your boiler's main brain and your thermostat is physically broken or scrambled. The most common reason is a loose or damaged wire between the boiler and the control base, or a localized power surge that has caused the communication port on the internal circuit board to freeze.
DIY fix possible
Check that your smart thermostat gateway or hub is plugged in and powered onEnsure your Wi-Fi router is working correctlyTurn the boiler power off and back on at the fused spur switch to reboot the system
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Worcester Bosch models that show the 1010 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 1010 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