Low
t2 on Worcester Bosch Greenstar CDi Compact

Your boiler is currently running an internal self-test on its air extraction fan to ensure it is working correctly, which is a normal automated process.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

Fan test. Checking the basic fan operation. The fan will run for a maximum of 30 seconds. If the fan is OK then the fan will be heard running.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

Related fault codes

EAView →F7View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →