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Vaillant Boiler Fault Codes
Browse the available Vaillant boiler fault codes in one place, then open the exact code page for the likely meaning, safe first steps, and when to stop troubleshooting.
Browse the parent brand page: Vaillant
All fault codes in this cluster
18 code pages currently available for this brand and appliance cluster.
| Code | Meaning | Severity |
|---|---|---|
| F22 | System water pressure is too low | medium |
| F23 | System water pressure is too low | medium |
| F24 | Water circulation or pump performance issue | high |
| F27 | Flame detection has been lost during operation | high |
| F28 | The boiler has failed to ignite properly | high |
| F29 | Flame detection has been lost during operation | high |
| F32 | Fan, flue, or air pressure sensing problem | high |
| F54 | Gas supply control or gas valve issue | high |
| F61 | Gas supply control or gas valve issue | high |
| F62 | Gas supply control or gas valve issue | high |
| F64 | A boiler sensor is giving an invalid reading | medium |
| F65 | The boiler has overheated or hit a high temperature limit | high |
| F67 | Control board or internal communication fault | high |
| F72 | A boiler sensor is giving an invalid reading | medium |
| F75 | Water circulation or pump performance issue | high |
| F76 | The boiler has overheated or hit a high temperature limit | high |
| F77 | Condensate, drainage, or pump protection issue | medium |
| F83 | A boiler sensor is giving an invalid reading | medium |
Featured fault codes
F22 meaning and fix
System water pressure is too low
F23 meaning and fix
System water pressure is too low
F24 meaning and fix
Water circulation or pump performance issue
F27 meaning and fix
Flame detection has been lost during operation
F28 meaning and fix
The boiler has failed to ignite properly
F29 meaning and fix
Flame detection has been lost during operation
F32 meaning and fix
Fan, flue, or air pressure sensing problem
F54 meaning and fix
Gas supply control or gas valve issue
F61 meaning and fix
Gas supply control or gas valve issue
F62 meaning and fix
Gas supply control or gas valve issue
F64 meaning and fix
A boiler sensor is giving an invalid reading
F65 meaning and fix
The boiler has overheated or hit a high temperature limit