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
E50 High Engineer
Your boiler has temporarily stopped working because it has detected an issue with the sensor that measures the temperature of the exhaust gases coming from the flue.
Full guide for E5004
E125 High Engineer
Your boiler has detected an issue with the internal water pump, which means it cannot circulate water properly to provide heating or hot water.
Full guide for E12505
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 E13006
E133 High Engineer
Your boiler has temporarily stopped working because it cannot detect a steady flame, which usually points to an issue with your gas supply or the way the boiler is igniting.
Full guide for E133on the Baxi Platinum Combi HE
Water pressure switchPressure relief valveExpansion vesselCentral Heating NTC ThermistorWiring harnessFlue NTC 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 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