High
T2 on Worcester Bosch 24 RSF

Your boiler is struggling to start up because it cannot confirm that the fan is spinning at the right speed to safely clear away exhaust gases.

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.

Technical description

Fan test – checking the basic fan

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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Related fault codes

T1View →T3View →T6View →

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