24VNA6 / 25VNA4 seriesCarrier 86 fault code (24VNA6 / 25VNA4)

VFD Communication Error

1. Code 86-06 VFD System Fault - Communication / Code 86-46 VFD System Lockout - Communication

   If communication between VFD and PCM does not occur for a continuous 15 seconds, code 86-06 is set by PCM. 3 occurrences within 15 minutes will result in 86-46 malfunction, which has a 1 hour lockout. When code 86-06 is set, VFD will shut down compressor and fan, and re-initialize in an attempt to re-establish communication between VFD and PCM. Inspect PCM to VFD communication harness for damage and connectivity, replace if necessary. If this does not fix problem, the VFD communicating components have been damaged and PCM or VFD requires replacement.

   24VNA6-25VNA4-1SM, p. 23