Baxi and Main boilers display error codes whenever the system detects a fault or abnormal operation. These codes help identify common issues related to water pressure, overheating, ignition failure, gas supply problems, fan operation, and electrical faults within the boiler.
If your boiler display shows codes such as E110, E119, or E133, it usually means the system has automatically locked out to prevent unsafe operation or further damage. Understanding these codes can help identify the possible cause of the issue.
You may attempt to reset the boiler once to see if the issue clears. Sometimes a fault code can appear due to a temporary system interruption or minor fluctuation. If the code clears after the reset and does not return, it was likely a temporary issue.
However, if the fault code returns immediately after resetting, it usually means an underlying problem still exists within the system. Repeatedly resetting the boiler will not resolve mechanical, electrical, or gas-related faults and may require professional inspection.
Overheat Fault
The boiler has overheated.
Low Pressure
System pressure is too low.
Check the pressure gauge.
Pressure should be around 1–1.5 bar.
Refill the system if pressure is low.
Circulation Fault
Poor water circulation detected.
Poor circulation can overheat the system. Check the pump and pipe flow. Service inspection may be required.
Ignition Failure
The boiler failed to ignite.
Internal PCB
Communication or internal control issue within the boiler.
Electrical faults may affect system control.
Professional inspection is recommended
to test and repair internal components.
Fan Fault
The boiler fan is not operating correctly.
Contact a Gas Safe registered engineer if:
Gas, fan and PCB faults should not be ignored.
To reduce breakdown risk:
Routine maintenance extends component lifespan.
Main boilers are manufactured by Baxi and often use similar coding systems.
Low pressure itself is not dangerous, but repeated pressure loss needs investigation.
The ignition issue has not been resolved.
Overheating issues usually relate to circulation and require inspection.
Yes. We diagnose and repair common Baxi and Main boiler faults.
If your boiler is locked out or displaying an error, contact us for professional diagnosis.
Accurate diagnosis. Safe repair. Reliable heating restored.
