Lockout (LED Mode) High

Potterton Lockout (LED Mode) Fault Code

Also written as LOCKOUTLEDMODE — same fault.

The Potterton Lockout (LED Mode) fault code means: your boiler has detected a safety fault and shut itself down to prevent damage, meaning your heating and hot water are currently unavailable.. It appears on 2 Potterton models in our database.

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: Status: Green LED OFF, Red LED FLASHING 2 Per Sec.
Typical repair cost £120-250 (including labour)

Engineer required

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

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Potterton models that show the Lockout (LED Mode) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Potterton Lockout (LED Mode) fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026