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Wolf Fault Codes
Select a fault code to see its meaning, common causes and how to fix it.
- FC 01 The Wolf FC 01 code is not listed in any publicly verified Wolf boiler fault code documentation, which means it is… Read more →
- FC 02 The Wolf FC 02 code is not a widely documented fault code in Wolf's standard boiler fault-code library, which typically… Read more →
- FC 03 The Wolf FC 03 code appears on certain Wolf boiler models and most likely indicates a fan or combustion air-flow… Read more →
- FC 04 The FC 04 code indicates that your Wolf boiler has attempted to light the burner, failed to detect a successful… Read more →
- FC 05 FC 05 on a Wolf boiler indicates that the flame has been lost or could not be reliably confirmed within approximately… Read more →
- FC 06 The FC 06 fault code (also displayed as Error 6 on some Wolf models) indicates that the boiler has detected water… Read more →
- FC 07 The FC 07 fault code (also displayed as Error 7 on some Wolf boiler panels) means the boiler has detected that the… Read more →
- FC 08 The Wolf FC 08 fault code (also displayed simply as Error 8 on some Wolf models) indicates that the boiler's control… Read more →
- FC 10 Wolf boilers display two separate fault codes that both contain the number 10, and they are frequently confused.… Read more →
- FC 107 The FC 107 fault code indicates that your Wolf boiler's control board has detected insufficient water circulation… Read more →
- FC 11 FC 11 (also displayed as Error 11 or F11 on some Wolf models) means the boiler's control board is detecting a flame… Read more →
- FC 116 FC 116 is a fault lockout code displayed on Wolf boiler control panels. On Wolf heating appliances, the 'FC' prefix… Read more →
- FC 12 Fault code 12 on a Wolf gas boiler signals that the boiler's flow temperature sensor (sometimes called the NTC sensor… Read more →
- FC 13 FC 13 (also displayed as Error 13 on some Wolf controller variants) indicates that the boiler has detected a problem… Read more →
- FC 14 Fault code 14 (displayed as FC 14 or Error 14 depending on the model) tells you that the boiler's control unit has… Read more →
- FC 15 Error 15 (sometimes noted as FC 15) on a Wolf gas boiler points to a problem with the outdoor temperature sensor… Read more →
- FC 16 Fault code 16 on a Wolf gas boiler indicates that the control board has detected an abnormal or absent signal from the… Read more →
- FC 20 The FC 20 (also displayed as Error 20 or F20 on some Wolf models) indicates that the boiler's control board has… Read more →
- FC 24 Wolf fault code FC 24 (also displayed as F24 on some models) indicates that the boiler's combustion fan has failed to… Read more →
- FC 255 The FC 255 code on a Wolf boiler points to an internal fault within the burner control unit (also known as the KIM or… Read more →
- FC 26 FC 26 (also displayed as Error 26) indicates that the boiler's fan is running non-stop and failing to stop when… Read more →
- FC 27 Error 27 on a Wolf boiler indicates a problem with one of the NTC (Negative Temperature Coefficient) temperature… Read more →
- FC 30 Fault code FC 30 on a Wolf gas boiler signals a CRC (Cyclic Redundancy Check) failure in the EP-ROM memory associated… Read more →
- FC 32 FC 32 — also displayed as Error 32 on Wolf boiler screens — indicates that the boiler's internal 24-volt DC power… Read more →
- FC 35 Error 35 on a Wolf boiler (including BWL, FGB, and CGB series) signals that the control board cannot detect a valid… Read more →
- FC 36 Error 36 on Wolf gas boilers indicates a CRC (Cyclic Redundancy Check) failure associated with the VSS parametric… Read more →
- FC 37 The FC 37 (also displayed as F 37 on some Wolf models) is a low water pressure fault. Your Wolf boiler's pressure… Read more →
- FC 39 Wolf FC 39 is an internal or electronic fault code that appears on certain Wolf boiler control displays, likely… Read more →
- FC 40 FC 40 on a Wolf boiler signals a flow switch fault. The boiler's control board is not receiving the expected on/off… Read more →
- FC 41 Error 41 on Wolf boilers indicates that the boiler cannot confirm the heating circulation pump is operating correctly.… Read more →
- FC 52 FC 52 on a Wolf boiler signals one of two distinct problems: either the parametric plug has not been correctly… Read more →
- FC 53 The F.53 code (displayed as FC 53 on some Wolf boiler models) indicates a problem with the mass flow sensor. This… Read more →
- FC 54 The F.54 fault code on a Vaillant boiler signals that the appliance has detected insufficient gas pressure or an… Read more →
- FC 55 When your Wolf boiler displays FC 55, the 'FC' prefix simply tells you the boiler has entered fault mode — it is a… Read more →
- FC 56 The F.56 code appears on Wolf boilers when the control board detects a problem regulating gas flow through the mass… Read more →
- FC 57 The FC 57 (also displayed as F.57) fault code on Wolf boilers indicates a problem during what the boiler calls 'comfort… Read more →
- FC 58 Fault code 58 on Wolf boilers (sometimes displayed as FC 58 on CGB and CGB-K series controllers) indicates that the… Read more →
- FC 59 The Wolf FC 59 fault code appears on Wolf boilers equipped with an eBUS-capable controller, where the 'FC' prefix… Read more →
- FC 78 FC 78 on Wolf boilers indicates a problem with a temperature sensor used to monitor water or collector circuit… Read more →
- FC 90 The Wolf FC 90 fault code indicates that your boiler has entered a fault or lockout condition associated with an… Read more →
- FC 95 On Wolf boilers, 'FC 95' is not a single combined fault code in the traditional sense. Instead, 'FC' (or 'F' followed… Read more →
- FC 96 FC 96 does not appear as a verified, documented fault code across Wolf's published boiler manuals or known fault code… Read more →
- FC 98 FC 98 on a Wolf boiler signals a problem with the R21 resistor plug — a small configuration component that communicates… Read more →
- FC 99 Wolf boilers display a numeric error code on their control panel, and what many users refer to as 'FC 99' is almost… Read more →