High
1010 on Worcester Bosch Greenstar 8000 Life Combi

Your boiler's internal computer system has lost communication with its external controls or smart thermostat, meaning it cannot receive instructions to turn on.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

No communication via EMS BUS connection

From this model's manual
Verified against the Worcester Bosch Greenstar 8000 Life Style installation & service manual, page 77.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this 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.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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