Stand-by Low

Potterton Stand-by Fault Code

Also written as STANDBY — same fault.

The Potterton Stand-by fault code means: your boiler is currently in a waiting state and is not actively calling for heat, which usually means it is working correctly but just sitting idle.. 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: Control Status: Stand-by

DIY fix possible

Check your room thermostat is turned up high enough to trigger the boilerEnsure your heating timer or clock is set to an 'on' periodCheck if your hot water cylinder thermostat is satisfied

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Potterton models that show the Stand-by fault code

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

Source

Potterton Stand-by 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