Vaillant fault codes, explained.
Find your code below — each guide covers what it means, likely causes, safe checks, and when to call a Gas Safe engineer.
Most searched Vaillant codes
The codes Vaillant owners look up most — each guide explains what the display is telling you, how serious it is, and the safe checks worth trying before you ring us.
Vaillant code library (48)
CONNECTION Vaillant Fault Code CONNECTION: Causes & Solutions F00 F0 Vaillant Fault Code F.00 / F.0: Causes & Solutions F00 04 05 10 14 15 Vaillant Fault Code F.00, .04, .05, .10, .14, .15: Causes & Solutions F00 Vaillant Fault Code F.00: Causes & Solutions F01 F1 Vaillant Fault Code F.01 / F.1: Causes & Solutions F01 Vaillant Fault Code F.01: Causes & Solutions F1 Vaillant Fault Code F.1: Causes & Solutions F4 Vaillant Fault Code F.4: Causes & Solutions F5 Vaillant Fault Code F.5: Causes & Solutions F6 Vaillant Fault Code F.6: Causes & Solutions F10 Vaillant Fault Code F.10: Causes & Solutions F11 Vaillant Fault Code F.11: Causes & Solutions F12 Vaillant Fault Code F.12: Causes & Solutions F13 Vaillant Fault Code F.13: Causes & Solutions F17 Vaillant Fault Code F.17: Causes & Solutions F20 Vaillant Fault Code F.20: Causes & Solutions F21 Vaillant Fault Code F.21: Causes & Solutions F22 Vaillant Fault Code F.22: Causes & Solutions F23 Vaillant Fault Code F.23: Causes & Solutions F24 Vaillant Fault Code F.24: Causes & Solutions F25 Vaillant Fault Code F.25: Causes & Solutions F26 Vaillant Fault Code F.26: Causes & Solutions F27 Vaillant Fault Code F.27: Causes & Solutions F28 Vaillant Fault Code F.28: Causes & Solutions F29 Vaillant Fault Code F.29: Causes & Solutions F32 Vaillant Fault Code F.32: Causes & Solutions F49 Vaillant Fault Code F.49: Causes & Solutions F60 Vaillant Fault Code F.60: Causes & Solutions F61 Vaillant Fault Code F.61: Causes & Solutions F62 Vaillant Fault Code F.62: Causes & Solutions F63 Vaillant Fault Code F.63: Causes & Solutions F64 Vaillant Fault Code F.64: Causes & Solutions F65 Vaillant Fault Code F.65: Causes & Solutions F67 Vaillant Fault Code F.67: Causes & Solutions F68 Vaillant Fault Code F.68: Causes & Solutions F70 Vaillant Fault Code F.70: Causes & Solutions F71 Vaillant Fault Code F.71: Causes & Solutions F72 Vaillant Fault Code F.72: Causes & Solutions F73 Vaillant Fault Code F.73: Causes & Solutions F74 Vaillant Fault Code F.74: Causes & Solutions F75 Vaillant Fault Code F.75: Causes & Solutions F76 Vaillant Fault Code F.76: Causes & Solutions F77 Vaillant Fault Code F.77: Causes & Solutions F78 Vaillant Fault Code F.78: Causes & Solutions F83 Vaillant Fault Code F.83: Causes & Solutions F84 Vaillant Fault Code F.84: Causes & Solutions F85 Vaillant Fault Code F.85: Causes & Solutions S3 Vaillant Fault Code S.3: Causes & Solutions
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