No Switched Live High

Potterton No Switched Live Fault Code

Also written as NOSWITCHEDLIVE — same fault.

The Potterton No Switched Live fault code means: your boiler has completely lost the electrical signal it needs to start running, meaning it is currently unable to provide any heating or hot water.. 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: Internal fuse blown, no mains supply, or faulty control PCB/transformer.
Typical repair cost £150-350 (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 No Switched Live fault code

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

Source

Potterton No Switched Live 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 7 July 2026