Code 88-39 VFD Internal Fault – Microprocessor Code 88-79 VFD Internal Lockout – Microprocessor

This VFD has internal diagnostics to verify that the microprocessor is operating sufficiently to maintain safe compressor and fan operation. If the microprocessor detects any abnormal condition that could result in unsafe operation it will set a diagnostic code. If this occurs, the PCM will set 88-39 and reset the VFD to attempt to remedy the condition. If this attempt is unsuccessful, malfunction Code 88-79 will be set and the system will be locked out for 4 hours. Manually power cycle the outdoor system. If the diagnostic code persists replace the VFD.

---

Pages de dépannage ACHPVSR454-02SM.