ON Low

Potterton ON Fault Code

The Potterton ON fault code means: your boiler is operating normally and successfully maintaining a flame, meaning everything is working exactly as it should.. 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: FLAME Detected (Green LED)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Potterton models that show the ON fault code

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

Source

Potterton 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