BoilerFaultCodesThe 6 most common faults
01
E119 High DIY-safe
Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low.
What to try first
Locate the filling loop under your boiler or near the pipes.Open the valves slowly to let mains water into the system until the pressure gauge reads between 1 and 1.5 bar.Close both valves tightly and reset the boiler.
02
E20 High Engineer
Your boiler has lost track of how hot the water inside the heating system is because a temperature sensor has failed.
Full guide for E2003
E28 High Engineer
Your boiler is struggling to clear exhaust gases safely and has turned itself off to prevent a potential hazard.
Full guide for E2804
E50 High Engineer
Your boiler is struggling to detect the temperature of the water it is trying to heat, so it has shut down to prevent overheating.
Full guide for E5005
E125 High Engineer
Your boiler has detected that water is not flowing properly around your heating system, so it has safely shut down to prevent overheating.
Full guide for E12506
E130 High Engineer
Your boiler has temporarily stopped working because it has detected that the exhaust gases coming from the flue are too hot.
Full guide for E130on the Baxi Platinum 24 Combi ErP
Water pressure switchPressure relief valveExpansion vesselCentral Heating NTC ThermistorWiring harnessFlue sensor (NTC)
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 Baxi 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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