Fault codes covered
85-13, 85-53
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.
Source: ACHPVSR454-02SM troubleshooting pages.