BoilerFaultCodesThe 4 most common faults
01
RED LED on continuously High Engineer
Your boiler has detected that it is running too hot and has automatically shut down for safety to prevent damage.
Full guide for RED LED on continuously02
All lights OFF High Engineer
Your boiler has lost all power and is completely unresponsive, meaning it cannot provide heating or hot water until the electrical connection is restored.
Full guide for All lights OFF03
Lockout (Rapid Flashing Red) High Engineer
Your boiler has failed to start after several attempts and has switched itself off for safety, usually because it cannot detect a flame or is struggling to get fuel.
Full guide for Lockout (Rapid Flashing Red)04
Red LED: FLASHING High Engineer
Your boiler has detected that it is getting too hot and has automatically shut down to prevent damage or dangerous overheating.
Full guide for Red LED: FLASHINGon the Potterton Profile 60E
Overheat ThermostatNTC SensorPCBInternal fusePrinted Circuit Board (PCB)Wiring harness
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Potterton shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue