BoilerFaultCodesThe 6 most common faults
01
E119 High DIY-safe
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
What to try first
Locate the external filling loop, which consists of a flexible silver hose connecting two pipes beneath the boiler.Open the valves on both ends of the filling loop to allow cold mains water into the heating system.Monitor the pressure gauge on the front of the boiler until the needle reaches between 1.0 and 1.5 bar, then securely close both valves.
02
119 High DIY-safe
Your boiler has detected that the water pressure inside the system is too low to operate safely.
What to try first
Locate the external filling loop, which is a silver braided hose connecting two pipes under the boiler.Open the valves at both ends of the hose to allow mains water into the system.Watch the pressure gauge on the front panel and close the valves once the needle reaches 1.5 bar.
03
E20 High Engineer
Your boiler's temperature sensor has stopped sending a clear signal, so it has shut down to prevent overheating.
Full guide for E2004
E28 High Engineer
Your boiler's flue sensor is detecting a fault, meaning the system cannot accurately monitor the temperature of the exhaust gases, so it has safely shut down to prevent damage.
Full guide for E2805
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 E5006
E110 High Engineer
Your boiler has detected that it has become dangerously hot and has automatically shut itself down to prevent damage.
Full guide for E110on the Baxi Platinum Combi HE A
Pressure Relief ValvePressure TransducerPressure relief valvePressure gaugeExpansion vesselCentral Heating 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