BoilerFaultCodesThe 6 most common faults
01
202 High DIY-safe
Your boiler has stopped because it is not receiving enough gas to stay lit.
What to try first
Check if other gas appliances in your home, such as the cooker, are working.Verify that your gas supply meter tap is fully open and the emergency control valve has not been accidentally tripped.Check if your prepayment gas meter has run out of credit and needs topping up.If you recently had gas work done, try resetting the boiler once the gas supply is confirmed.
02
E19 High Engineer
Your boiler has detected that the water returning from your radiators is dangerously hot, causing it to shut down to prevent damage.
Full guide for E1903
E24 High Engineer
Your boiler has temporarily stopped working because the water inside is getting too hot in one part compared to another, usually due to a blockage in the flow.
Full guide for E2404
E26 High Engineer
Your boiler is failing to light the flame or maintain it, meaning you likely have no heating or hot water at the moment.
Full guide for E2605
E30 High Engineer
Your boiler has detected that the water returning from your radiators is significantly hotter than the water leaving it, indicating a potential blockage or water flow issue.
Full guide for E3006
01 High Engineer
Your boiler has detected an electrical fault in its control system, which means it has safely shut itself down to prevent damage to its internal components.
Full guide for 01on the Vokera Eclipse ESC
Gas valveGas regulatorReturn NTC sensorPumpPrimary heat exchangerCirculating pump
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