High
259 on Worcester Bosch Greenstar 8000 Life & Style

Your boiler's internal computer has encountered a software or communication error and can no longer control the heating process.

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

System fault boiler electronics / basic controller

From this model's manual
Verified against the Worcester Bosch Greenstar 8000 Life Style installation & service manual, page 76.
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 boiler's main control board loses the ability to communicate with the internal software or the display screen unit. It is typically caused by a critical hardware failure within the electronics or a corrupted data link between the internal components. In most cases, the central processor has failed to perform its safety checks, forcing the system to shut down for protection.

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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