BoilerFaultCodesThe 6 most common faults
01
E030 High Engineer
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Full guide for E03002
E040 High Engineer
Your boiler has detected that the internal part responsible for pushing out exhaust gases is not spinning correctly, so it has safely shut itself down to prevent any unsafe operation.
Full guide for E04003
E041 High Engineer
Your boiler has detected that the water pressure is too low or inconsistent to safely provide heating and hot water.
Full guide for E04104
E042 High Engineer
Your boiler is struggling to detect the flow of water because its internal sensor is faulty, which is preventing it from heating your water properly.
Full guide for E04205
E060 High Engineer
Your boiler has lost the ability to accurately measure the temperature of the hot water it produces, so it has stopped heating your taps to prevent potential overheating.
Full guide for E06006
E077 High Engineer
Your boiler is struggling to detect the flow of water through the system, which means it has stopped producing hot water and heating to prevent damage.
Full guide for E077on the Vokera Vision Plus 35C/40C
Limit thermostatPumpDiverter valvePrimary heat exchangerFan assemblyWiring 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
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