BoilerFaultCodesPotterton Lockout Fault Code
Also written as LOCKOUT — same fault.
The Potterton Lockout fault code means: your boiler has stopped working because it couldn't successfully light the flame after three attempts, often caused by a temporary interruption in the gas supply or air in the lines.. It appears on 11 Potterton models in our database.
Technical description: Boiler fails to light within 3 attempts (due to air in the system). Upper Red LED on the control panel will go to a rapid flashing mode.
DIY fix possible
Check that your gas supply is turned on at the meter and that other gas appliances are workingLocate the reset button or turn the control knob to the reset position to clear the errorWait for the boiler to cycle through its ignition process automatically
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Potterton models that show the Lockout fault code
Click a model for the full fault code list and model-specific repair notes.
- Combi 80 Repair: £120-250
- Envoy 30 Repair: £150-350
- Envoy Plus Repair: £150-350
- Prima 30B Repair: £120-250
- Profile 60E Repair: £120-250
- Puma 100e Repair: £100-250
- Puma 80/100 Repair: £120-250
- Statesman Repair: £120-250
- Suprima HE Repair: £120-250
- Ultra 2 30 DV Repair: £150-350
- Ultra 2 50 DV Repair: £120-250
Source
Potterton Lockout 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