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

Typical repair cost for the Potterton Lights Flash On Flash fault is £250-400 including labour.

Lights Flash On Flash High

Potterton Lights Flash On Flash Fault Code

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

The internal computer board inside your boiler has developed a fault and is failing to send the correct signals to start your heating and hot water.

Also written as LIGHTSFLASHONFLASH — same fault.

The Potterton Lights Flash On Flash fault code means: the internal computer board inside your boiler has developed a fault and is failing to send the correct signals to start your heating and hot water.. It appears on 3 Potterton models in our database.

Technical description: PCB Fault. Replace PCB.

Typical repair cost £250-400 (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 Flash On Flash fault code

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

Source

Potterton Lights Flash On Flash 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