High
1076 W on Worcester Bosch Greenstar 30i

Your boiler has lost communication with a vital heat sensor, meaning it won't fire up because it cannot safely monitor its internal temperature.

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 signal from the temperature sensor at the heating block available – replace the temperature sensor, the connecting lead or the control unit

Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

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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