BoilerFaultCodesThe 6 most common faults
01
é7 High DIY-safe
Your boiler has detected that the water pressure inside the system is far too low to function safely.
What to try first
Locate the filling loop (usually two silver taps connected by a braided hose) underneath the boiler.Gradually open the taps to let mains water into the heating system until the pressure gauge reads between 1.0 and 1.5 bar.Close both taps tightly and check the display to see if the error has cleared.
02
E2 High Engineer
Your boiler has detected that it is not heating the water effectively, often caused by trapped air in the system or a temporary lockout that requires a reset.
Full guide for E203
é1 High Engineer
Your boiler is currently performing a necessary safety check before it attempts to ignite, but it has stalled at this initial stage.
Full guide for é104
é2 High Engineer
Your boiler is failing to light the flame, which means it cannot produce any heating or hot water for your home.
Full guide for é205
é4 High Engineer
Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a build-up of unburnt gas.
Full guide for é406
E3 High Engineer
Your boiler has detected an internal electrical fault with a temperature sensor, which has caused it to shut down for safety reasons.
Full guide for E3on the Remeha Avanta 28c
Pressure relief valveFilling loopSystem pressure sensorAir pressure switchCirculation pumpNTC sensor
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 Remeha 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