How much does it cost to fix Potterton error code Neon5?

Typical repair cost for the Potterton Neon5 fault is £90-180 including labour.

Neon5 High

Potterton Neon5 Fault Code

Q: What does the Potterton Neon5 fault code mean?

Your boiler has shut itself down because it has detected that the water or the exhaust fumes have become too hot.

Also written as NEON5 — same fault.

The Potterton Neon5 fault code means: your boiler has shut itself down because it has detected that the water or the exhaust fumes have become too hot.. It appears on 1 Potterton model in our database.

Technical description: Safety Thermostat Activated (Boiler or Flue)

What causes the Potterton Neon5 fault?

This fault occurs when the boiler's internal temperature exceeds safe limits, triggering a safety sensor to cut off the gas supply. The most common reasons are a failed pump stopping water from circulating or a build-up of limescale and sludge creating a blockage that traps heat inside the heat exchanger.

This issue often surfaces during the first cold spell of autumn when the heating is turned back on after months of inactivity, as pumps can seize during the summer.

Typical repair cost £90-180 (including labour)

DIY fix possible

Check that your radiator valves are open and not turned to zeroTurn the control knob to the 'Reset' position for five seconds and then back to 'On'Ensure the boiler pressure gauge is between 1 and 1.5 bar

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Potterton models that show the Neon5 fault code

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

Performa System HE Repair: £90-180

Source

Potterton Neon5 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