High
2967 B on Worcester Bosch Greenstar 8000 Life System

Your boiler has detected that water isn't moving through the unit as expected, likely due to a circulation issue or a sensor that is no longer properly attached.

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

Flow/heat exchanger temperature sensor differential too great 1. Supply sensor is not assembled on the supply pipe. 2. Supply sensor does not make proper contact to the supply pipe. 3. System is not filled with water. 4. No water flow, because CH system is closed. 5. No water flow, because pump is not operating correctly.

From this model's manual
Verified against the Worcester Bosch Greenstar 8000 Life System installation & service 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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