24VNA6 / 25VNA4 seriesCarrier 83 fault code (24VNA6 / 25VNA4)

Compressor Current Limit 1 Speed Reduction; Compressor Current Limit 2 Speed Reduction; Compressor Current Limit 3 Shutdown; Compressor Current Limit 4 Shutdown; Compressor Underspeed Shutdown

1. Code 83-11 VFD Compressor Fault - Current 1 / Code 83-12 VFD Compressor Fault - Current 2

   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. While codes are active the VFD will continue to operate compressor at a reduced or limited speed, and fan operation will not be affected directly. This code will clear once compressor current drops below threshold. This code indicates the compressor may have minor damage and requires slightly higher torque (current) to operate at desired rpm. If damage continues to worsen the compressor may cause code 83-15, 83-55, 83-16, and 83-56. Check system for overcharge and indoor/outdoor coil blockage as well as input voltage. Listen to compressor during operating for abnormal noise indicating physical damage. If code persists or compressor has abnormal noise, replace compressor.

   24VNA6-25VNA4-1SM, p. 22

2. Code 83-15 VFD Compressor Fault - Current 3 / Code 83-55 VFD Compressor Lockout - Current 3 / Code 83-16 VFD Compressor Fault - Current 4 / Code 83-56 VFD Compressor Lockout - Current 4

   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.

   24VNA6-25VNA4-1SM, p. 22

3. Code 83-57 VFD Compressor Lockout - Current 1

   This code will be set when any of the VFD compressor speed limiting codes are active and the compressor speed is reduced below the lowest allowable operating speed for a given OAT. Once 1 hour lockout timer expires the unit will attempt to resume operation. This code indicates the compressor requires higher torque (current) to operate at desired rpm and compressor is mechanically damaged. If code persists, replace compressor.

   24VNA6-25VNA4-1SM, p. 22