BoilerFaultCodesThe 6 most common faults
01
IGNITION LOCKOUT High Engineer
Your boiler has stopped working because it has tried to light several times but failed to detect a flame.
Full guide for IGNITION LOCKOUT02
DRY-FIRE LOCKOUT High Engineer
Your boiler has detected that water is not circulating properly through the system, which triggers a safety lock to prevent internal damage.
Full guide for DRY-FIRE LOCKOUT03
NO FAN RUN High Engineer
Your boiler has temporarily stopped working because it has detected an issue with the internal water flow and circulation system.
Full guide for NO FAN RUN04
E06 058 High Engineer
Your boiler has stopped working because it is unable to accurately measure the temperature of the water inside it, causing it to shut down for safety.
Full guide for E06 05805
E06 059 High Engineer
Your boiler is struggling to detect the water flowing through it, which is preventing it from safely firing up your heating or hot water.
Full guide for E06 05906
E06 060 High Engineer
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Full guide for E06 060on the Potterton Promax 24 HE
Ignition electrodeGas valvePrinted circuit board (PCB)Central heating pumpAutomatic bypass valvePCB
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