Switched Live 'On' Low

Potterton Switched Live 'On' Fault Code

Also written as SWITCHEDLIVEON — same fault.

The Potterton Switched Live 'On' fault code means: your boiler has correctly received a signal from your thermostat or timer and is successfully starting the heating process as requested.. 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.

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 Switched Live 'On' fault code

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

Source

Potterton Switched 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