Brand hub
Vaillant Fault Codes
Check Vaillant boiler fault codes and understand which steps are safe for homeowners and which need an engineer. Use this hub to move into the right appliance section, then open the exact fault code page for quick meaning, safe first checks, and escalation advice.
Appliance hubs
1
Fault code pages
18
Guides linked in
1
Appliance types
Top fault codes in this cluster
F22 for Boiler
System water pressure is too low
F23 for Boiler
System water pressure is too low
F24 for Boiler
Water circulation or pump performance issue
F27 for Boiler
Flame detection has been lost during operation
F28 for Boiler
The boiler has failed to ignite properly
F29 for Boiler
Flame detection has been lost during operation
F32 for Boiler
Fan, flue, or air pressure sensing problem
F54 for Boiler
Gas supply control or gas valve issue
F61 for Boiler
Gas supply control or gas valve issue
F62 for Boiler
Gas supply control or gas valve issue
F64 for Boiler
A boiler sensor is giving an invalid reading
F65 for Boiler
The boiler has overheated or hit a high temperature limit