Permanent Live 'On' Low

Potterton Permanent Live 'On' Fault Code

Also written as PERMANENTLIVEON — same fault.

The Potterton Permanent Live 'On' fault code means: your boiler is currently reporting that it is receiving a constant electrical signal to start heating, which is a normal indicator light used by engineers to check that the internal wiring is receiving power.. It appears on 2 Potterton models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Indicator lamp on the ignition board to aid electrical commissioning. Sequence when there is a call for heat.

DIY fix possible

Check that your room thermostat or programmer is set to 'On' or 'Auto'Verify that the temperature setting on the thermostat is higher than the current room temperatureNo action is required if the boiler is operating normally, as this is a status indicator

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Potterton models that show the Permanent Live 'On' fault code

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

Source

Potterton Permanent Live 'On' 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