BoilerFaultCodesPotterton 50° neon flashing Fault Code
Also written as 50NEONFLASHING — same fault.
The Potterton 50° neon flashing fault code means: your boiler has detected that the fan, which safely clears waste gases away, is not spinning as fast as it needs to for the boiler to light safely.. It appears on 3 Potterton models in our database.
Technical description: Fan not running at maximum speed.
What causes the Potterton 50° neon flashing fault?
This fault occurs when the boiler's internal computer detects that the fan is not reaching the necessary speed to safely expel exhaust gases. The most common reasons are a build-up of dirt within the fan or a blockage in the small tubes that monitor air pressure. If the fan cannot create enough airflow, the boiler will prevent ignition to ensure carbon monoxide doesn't build up inside the unit.
This fault can be more frequent during autumn or windy weather, as debris or strong gusts can obstruct the flue or put extra strain on a struggling fan motor.
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 50° neon flashing fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 50° neon flashing 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