BoilerFaultCodesThe 6 most common faults
01
No lights High DIY-safe
Your boiler has completely lost power, meaning it cannot start the heating or hot water process.
What to try first
Check if other appliances in the house have powerCheck your home's main consumer unit (fuse box) to see if a circuit has trippedCheck the fused spur switch near the boiler is turned on and try replacing the 3-amp fuse
02
Orange light (Boiler fault) High DIY-safe
Your boiler has detected a problem and has shut itself down for safety, meaning your heating and hot water will stop working until it is reset or repaired.
What to try first
Locate the reset button on the control panelPress and hold the reset button for five secondsWait for the boiler to attempt to reignite; if the light stays off and the boiler fires, it was a nuisance trip
03
Orange light (first) High Engineer
Your boiler is receiving a constant electrical signal even when it should be off, often caused by a faulty external control or internal component failure.
Full guide for Orange light (first)04
Orange light (second) High Engineer
Your boiler's electronic control box has detected an internal electrical failure or a timing error that prevents it from starting the ignition process.
Full guide for Orange light (second)05
Orange light (third) High Engineer
Your boiler is attempting to light but is failing to recognize the flame or ignite successfully.
Full guide for Orange light (third)06
Orange light (single) High Engineer
Your back boiler is receiving constant electricity but is not responding, which usually indicates the internal controller or a safety sensor has failed.
Full guide for Orange light (single)on the Baxi Bermuda 552
External fusePrinted Circuit Board (PCB)Wiring harnessGas ValveIgnition ElectrodeFlame Sensing Probe
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