BoilerFaultCodesThe 6 most common faults
01
0 00 High Engineer
Your boiler is temporarily locked out because it is detecting a flame inside when it shouldn't be burning.
Full guide for 0 0002
2 02 High Engineer
Your boiler has tried to start up, but it cannot detect a flame to keep the heating or hot water running safely.
Full guide for 2 0203
4 36 High Engineer
Your boiler has lost the connection to the part that monitors water movement, so it has safely shut down to prevent overheating.
Full guide for 4 3604
4 37 High Engineer
Your boiler has lost the signal from a temperature sensor that monitors the water returning to the system, causing the unit to stop working as a safety precaution.
Full guide for 4 3705
24 High Engineer
Your boiler has detected that the water temperature sensors are reading the pipes in the wrong order, preventing it from safely heating your home.
Full guide for 2406
30 High Engineer
Your boiler has detected an internal computer error and has safely shut down to prevent any further issues.
Full guide for 30on the Vokera Eclipse ESS
Flame sensorGas valvePrinted Circuit Board (PCB)Ignition electrodePCBFlow sensor 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 Vokera 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