High Lockout
E160 on Potterton Promax HE

Your boiler has stopped working because the fan that clears out exhaust gases isn't spinning at the correct speed.

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 fault

What causes this fault?

This fault occurs when the boiler's control system detects that the fan is either not spinning at all or is rotating at the wrong speed to safely clear exhaust gases. The most common cause is a mechanical failure within the fan motor or a communication error where the main circuit board can no longer control the fan's power supply.

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

E133View →

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