24VNA6 / 25VNA4: Service Manual
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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.
Code 84-11 VFD Heatsink Overtemp Fault
Code 84-58 VFD Heatsink Overtemp Malfunction
The VFD has internal temperature sensors to monitor critical power
components and take action if operating temperatures cross thresholds
that may shorten the VFDs operating life. If the heat sink temperature
sensor fails, it will no longer be capable of preventing critical power
components from operation above the safe reliable temperature
threshold. This fault will be set when the VFD IPM or PFCM
temperatures are greater than or equal to 203°F.
If this fault is active, the VFD will shut down compressor but continue to
operate fan to draw air across heat sink. Once heat sink temperature is
acceptable, system will restart but reduce demand by 25% for each
occurrence of 84-11. Once speed can no longer be reduced further, code
84-58 will be set and system locked out for 2 hours. Each hour of
operation without additional code 84-11 will allow increased demand of
25%. The most likely cause is restricted airflow over heat sink. Inspect
and clear heatsink of anything that may inhibit airflow or contact with
air. A less likely possibility is inadequate contact of power components
with heat sink, not allowing intended heat transfer between components
and heat sink. If clearing heatsink of blockage does not eliminate codes,
replace VFD.
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.
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.
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.
Code 87-13 VFD Initialization Fault
Code 87-53 VFD System Lockout - Initialization
The VFD communicates identification information to PCM when
initializing to run. This information is used to identify the equipment and
reference correct operating tables. When unrecognized information is
received the PCM will set fault 87-13 and reset the VFD to restart the
initialization process. After 3 instances of fault 87-13 within 4 hour
period 87-53 malfunction is set and system is locked out for 4 hours. The
most likely cause of this fault is an incorrect model plug. Check for
correct model plug in model plug table.
Code 88-15 VFD Internal Fault - Unexpect Reset
Code 88-55 VFD Lockout - Unexpected Reset
Communication between the VFD and PCM is monitored continuously.
If communication fails, the PCM will initiate a VFD reset in an attempt
to restart the communicating components of VFD. The system will shut
down and restart after 5 minute compressor protection timer expires.
Three occurrences of code 88-15 within a 1 hour period will result in
88-55 malfunction and 2 hour lockout. 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 VFD requires replacement.
Code 88-27 VFD Reprogramming Failure
Code 88-27 indicates that an attempt to reprogram the VFD failed. If
this diagnostic is not recent, then a subsequent reprogramming attempt
may have succeeded. The technician should check the current VFD
software version against the latest software release. If the VFD software
is not the most current, then the VFD should be reprogrammed manually
using the Infinity Control or the Carrier Service Tech App.
Code 88-31 VFD Internal Fault - Current Sensor
Code 88-71 VFD Lockout - Comp Current Sensor
The VFD measures the compressor current value internally. If the
compressor current measurement is not reported to VFD, it will shut
down and attempt a restart after 5 minute compressor protection timer
expires. Operating VFD without monitoring compressor current may
result in compressor damage. Three occurrences of code 88-31 within a
4 hour period will result in 88-71 malfunction and 4 hour lockout. While
this fault or malfunction is active the unit is inoperable. This
malfunction, once set, is unlikely to go away and indicates VFD damage.
Manually power cycle outdoor unit with disconnect, if malfunction
persists replace VFD.
Code 88-32 VFD Internal Fault - IPM Temp Sens
The VFD has internal temperature sensors to monitor critical power
components and take action if operating temperatures cross thresholds
that may shorten the VFDs operating life. If the IPM temperature sensor
fails it will no longer be capable of preventing the IPM module from
operation above the safe reliable temperature threshold. If this fault is
active the VFD will continue to operate normally, since the only way to
correct this fault is to replace VFD.
Code 88-33 VFD Internal Fault - DC Link Sensor
Code 88-73 VFD Lockout - DC Link Sensor
The VFD measures the DC voltage value internally. If the DC voltage
measurement is not within acceptable operating parameters the VFD will
shut down and attempt a restart after 5 minute compressor protection
timer expires. Three occurrences of code 88-33 within a 4 hour period
will result in 88-73 malfunction and 4 hour lockout. While this fault or
malfunction is active the unit is inoperable. This malfunction, once set,
is unlikely to go away and indicates VFD damage. Manually power
cycle outdoor unit with disconnect, if malfunction persists replace VFD.
