BoilerFaultCodesThe 6 most common faults
01
>3,0 bar High DIY-safe
Your boiler's water pressure is too high, meaning there is too much water circulating inside the system.
What to try first
Locate a radiator anywhere in your propertyUse a radiator bleed key to gently open the bleed valveDrain a small amount of water from the radiator into a cloth or container until the boiler gauge drops to 1.5 barClose the valve and check the boiler display
02
E020 High Engineer
Your boiler has detected that it is overheating and has safely shut itself down to prevent damage.
Full guide for E02003
E030 High Engineer
Your boiler has detected an issue with the internal ventilation system that pushes waste gases outside, so it has safely shut itself down to prevent operation.
Full guide for E03004
E040 High Engineer
Your boiler is struggling to accurately measure how much water pressure is inside the system, which is preventing it from firing up correctly.
Full guide for E04005
E041 High Engineer
Your boiler is struggling to detect that there is enough water flowing through the system to heat your home or water safely.
Full guide for E04106
E042 High Engineer
Your boiler is struggling to detect the flow of water through the system, which is preventing it from heating your home or water properly.
Full guide for E042on the Vokera Vision S
Pressure relief valveFilling loopSystem pressure sensorLimit thermostatPumpSystem diverter valve
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