24VNA6 / 25VNA4 seriesCarrier 85 fault code (24VNA6 / 25VNA4)

DC Under Voltage Shutdown; DC Over Voltage Shutdown

1. Code 85-13 VFD System Fault - DC Under Voltage / Code 85-53 VFD System Lockout - DC Under Volt

   The VFD boosts line voltage and uses the PFC circuit to maintain DC voltage within an acceptable range. Code 85-13 is set when the DC voltage is lower than the acceptable lower limit of 180VDC. Attempting to operate VFD below minimum DC voltage can cause failed/reduced compressor or fan operation. 4 occurrences within 1 hours result in 85-53 malfunction which has a 2 hour lockout time. An instance of 85-13 will result in VFD shutdown and system restart once 5 minute compressor protection timer expires. Low AC line voltage, quickly loading the compressor, or a damaged PFC circuit in VFD may result in a code 85-14. Check to ensure reactors are plugged in securely. Manually power cycle outdoor unit with disconnect, if malfunction persists replace reactors, then VFD.

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

2. Code 85-14 VFD System Fault - DC Over Voltage / Code 85-54 VFD System Lockout - DC Over Volt

   The VFD boosts line voltage and uses the PFC circuit to maintain DC voltage within an acceptable range. Code 85-14 is set when the DC voltage exceeds the acceptable upper limit of 410VDC. Exceeding maximum DC voltage can damage electrical circuits or shorten VFD's operating life. 4 occurrences within 1 hours result in 85-54 malfunction which has a 2 hour lockout time. An instance of 85-14 will result in VFD shutdown and system restart once 5 minute compressor protection timer expires. High AC line voltage or quickly unloading the compressor may result in a code 85-14. Manually power cycle outdoor unit with disconnect, if malfunction persists replace VFD.

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