Fault codes covered
83-15, 83-55, 83-16, 83-56
The VFD monitors multiple compressor current conditions and will limit or reduce compressor speed if the current rises above threshold. Current limits are model specific. Code 83-15, 83-16, 83-55, and 83-56 will result if the VFD is not capable of reducing compressor speed far enough or fast enough while running. This code will shut down system and attempt restart after 5 minute compressor protection timer has expired. 2 instances of code 83-15/83-16 in a 4 hour period will result in code 83-55/83-56 and a 2 hour lockout. These codes indicate the compressor requires higher torque (current) to operate at desired rpm. Check system for overcharge and indoor/outdoor coil blockage as well as input voltage. Check wiring from VFD to compressor for poor connections causing high current. Check compressor winding resistance against table. Listen to compressor during operating for abnormal noise indicating physical damage. VFD may have internal damage causing high current, or compressor may be damaged.
Source: ACHPVSR454-02SM troubleshooting pages.