High Lockout
160 on Potterton Promax Combi HE Plus

Your boiler has detected that the fan, which safely removes waste gases, is not spinning at the correct speed to operate safely.

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 runs at incorrect speed or fan fault

What causes this fault?

This fault occurs when the boiler's internal computer signals the fan to spin, but the fan fails to reach the required speed for safe combustion. The most common reason is that the fan motor has worn out or siezed over time, though it can also be caused by a communication failure between the control board and the fan wiring.

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

E160View →

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