How much does it cost to fix Potterton error code Lights: On On On?

Typical repair cost for the Potterton Lights: On On On fault is £120-220 including labour.

Lights: On On On High

Potterton Lights: On On On Fault Code

Q: What does the Potterton Lights: On On On fault code mean?

Your boiler has lost its internal connection to the main control board, meaning it cannot communicate correctly and has shut down for safety.

Also written as LIGHTSONONON — same fault.

The Potterton Lights: On On On fault code means: your boiler has lost its internal connection to the main control board, meaning it cannot communicate correctly and has shut down for safety.. It appears on 3 Potterton models in our database.

Technical description: LV Wiring Harness. Ensure 8-way PCB connector securely pushed in. If fault persists replace LV wiring harness.

Typical repair cost £120-220 (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 Lights: On On On fault code

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

Source

Potterton Lights: On On 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