BoilerFaultCodesThe 3 most common faults
01
Smell of unburnt gas Emergency Engineer
You are detecting unburnt gas, which indicates a serious safety risk that requires immediate professional intervention.
Full guide for Smell of unburnt gas02
Explosion at burner Emergency Engineer
Your boiler is struggling to light its flame smoothly, causing a small, audible 'thump' or pop when the gas finally catches. This indicates a combustion issue that requires immediate professional attention to ensure the system is burning safely.
Full guide for Explosion at burner03
Fume thermostat activation Emergency Engineer
Your boiler has detected that waste gases are not being cleared away properly, so it has safely shut itself down to prevent dangerous fumes from entering your home.
Full guide for Fume thermostat activationon the Ferroli Pegasus 67 107 2S
Gas valveBurner assemblyFlue sealsIgnition electrodeFume thermostatFlue assembly
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 Ferroli 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