High Lockout
E160 on Potterton Promax Combi HE Plus

Your boiler has detected an issue with the fan that clears exhaust fumes, preventing the system from starting for your safety.

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 or Fan Wiring Fault

What causes this fault?

This fault occurs when the boiler's control board fails to receive a signal that the fan is spinning at the correct speed to safely expel exhaust gases. The most common reason is that the fan motor has seized or its internal electronics have burnt out, though loose or damaged wiring can also interrupt this vital communication. Without a functioning fan, the boiler automatically shuts down to prevent dangerous fumes from building up inside the unit.

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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