High
2910 on Worcester Bosch Greenstar 2000

Your boiler is having trouble breathing, meaning it cannot properly clear exhaust gases or draw in fresh air due to a possible blockage or a fan issue.

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

Error in the flue gas system. (Too much or too little resistance in air flow) • the fan speed is higher than expected due too missing exhaust. • the fan speed is to low due to an obstruction in the exhaust.

From this model's manual
Verified against the Worcester Bosch Greenstar 27cdi installation & service manual, page 85.
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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