BoilerFaultCodesPotterton 23 Fault Code
The Potterton 23 fault code means: your boiler has attempted to light but has failed to detect a flame, causing it to shut down for safety.. It appears on 3 Potterton models in our database.
Technical description: Flame Failure
What causes the Potterton 23 fault?
This fault occurs when the boiler's internal sensors cannot confirm that a flame has successfully ignited after several attempts. The most common reasons are worn-out ignition sparks that fail to light the gas, or a dirty sensor that cannot 'see' the flame even if it is actually burning. It can also be caused by an interruption in the gas supply or a fault within the main control board.
This fault is slightly more common during the first cold snap of autumn, as internal components can stick or become unreliable after sitting idle throughout the summer months.
DIY fix possible
Check if other gas appliances in your home, such as a hob, are working to confirm gas supply.Verify that your gas meter has credit if you use a top-up or pre-payment system.Press and hold the reset button for five seconds to see if the boiler restarts.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Potterton models that show the 23 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 23 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