Fault codes covered
38-71
The VFD Estimator is used in the compressor starting process. While this fault is active the PEV will open and compressor will continue attempts at restarting. Three continuous code 38-31 will result in code 38-71 malfunction and 2 or 4 hour lockout. Repeated malfunctions indicate high starting torque and possible compressor damage. First, ensure the VFD model and compressor models are correct for unit being serviced as incorrect compressor motor parameters will not allow the VFD to complete the starting process correctly. If all parts are correct for the model being serviced, compressor damage exists and should be replaced.
Source: ACHPVSR454-02SM troubleshooting pages.