BoilerFaultCodesThe 6 most common faults
Your boiler has lost the water pressure needed to circulate heat, so it has safely shut down to prevent damage.
Locate the external filling loop, which is usually a silver braided hose under the boiler.Open the two valves on either end of the hose slowly to allow water into the system.Watch the pressure gauge until the needle reaches the green zone (ideally 1.0 to 1.5 bar).Close both valves tightly and remove the hose if required by your specific installation.
Your boiler's internal water pressure is too high, which can cause internal components to leak or the pressure relief valve to activate.
Locate a radiator in your home that is easily accessible.Place a small container and a cloth under the radiator bleed valve.Open the bleed valve slowly to release air and a small amount of water until the pressure gauge on the boiler drops to between 1.0 and 1.5 bar.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Full guide for E030Your 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 E040Your boiler has detected that the water pressure is too low or inconsistent to safely provide heating and hot water.
Full guide for E041Your 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 E042on the Vokera Vision Plus 35C/40C
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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