BoilerFaultCodesThe 6 most common faults
01
S.2 High DIY-safe
Your boiler has stopped heating up because the water is not being pumped through the system properly.
What to try first
Check that the boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and the boiler's service valves are fully openGently bleed air from your radiators using a radiator key
02
S.3 High DIY-safe
Your boiler is struggling to start the burner to provide heating, which means your radiators will not warm up.
What to try first
Check that your gas pre-pay meter has creditEnsure the gas stop tap is fully openPress the Reset button (indicated by a flame with a cross through it) and hold for 2 seconds
03
S.1 High Engineer
Your boiler is unable to start the heating process because its internal fan, which safely clears waste gases, is failing to spin up properly.
Full guide for S.104
S.6 High Engineer
Your boiler is failing to settle down correctly after heating your home because the internal fan is running for longer than the system expects.
Full guide for S.605
CONNECTION High Engineer
Your boiler's internal components are failing to talk to each other, meaning the system cannot start up to provide heat or hot water.
Full guide for CONNECTION06
S.7 Medium DIY-safe
Your boiler is temporarily finishing its heating cycle by running the pump to cool down, but it has detected that this process isn't working quite as expected.
What to try first
Check that at least one radiator (usually the one in the room with the thermostat) has its valves fully openEnsure the system pressure is between 1.0 and 1.5 bar on the pressure gaugePress the reset button once to see if the status clears
on the Vaillant Combi Compact 282EB
Circulation pumpAutomatic air ventPump capacitorIgnition ElectrodeFlame Sense ElectrodeGas Valve
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 Vaillant 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