Flame Failure (Red Light) High

Potterton Flame Failure (Red Light) Fault Code

Also written as FLAMEFAILUREREDLIGHT — same fault.

The Potterton Flame Failure (Red Light) fault code means: your boiler has tried to light but failed to stay on, meaning the system has shut down for safety until it is reset or repaired.. It appears on 1 Potterton model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: If Flame Failure Light is ON. Press the Reset Button. If Flame Failure occurs persistently consult your Installer or Service Engineer.

What causes the Potterton Flame Failure (Red Light) fault?

This fault occurs when the boiler's internal sensor fails to detect a steady flame after several ignition attempts. The most common reasons include a lack of gas reaching the burner, dirty electrodes that can no longer spark correctly, or a faulty sensor that cannot 'see' the flame even if it has lit.

This fault is more common during the first cold snap of winter when components that have been idle all summer are suddenly forced to work under high demand.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your gas supply is active (check other gas appliances like a hob)Press the Reset button on the front of the boiler for a few secondsEnsure your condensate pipe has not frozen if it is currently very cold outside

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Potterton models that show the Flame Failure (Red Light) fault code

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

Source

Potterton Flame Failure (Red Light) 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