BoilerFaultCodesPotterton SWITCHED LIVE Fault Code
Also written as SWITCHEDLIVE — same fault.
The Potterton SWITCHED LIVE fault code means: your boiler is not receiving the electrical signal from your thermostat or timer telling it to turn on.. It appears on 3 Potterton models in our database.
Technical description: No 230V at sL to N; check external controls and mains supply.
What causes the Potterton SWITCHED LIVE fault?
This fault occurs when the boiler is powered on but isn't receiving the necessary electrical 'command' from your external controls to start heating. The most common reason is a failure in the communication line between your room thermostat, programmer, or motorized valves and the boiler itself. Essentially, the boiler is waiting for a green light to fire up that never arrives because of a fault in those external components.
This issue is frequently discovered during the first cold snap of autumn when homeowners switch their heating back on after months of inactivity, causing stuck motorized valves to fail.
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your programmer or heating timer is set to 'ON' or 'AUTO'.Replace the batteries in your wireless thermostat if the screen is blank or showing a low battery symbol.
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Gas Safe Register →Potterton models that show the SWITCHED LIVE fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 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 27 April 2026