186CNV / 284ANV: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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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 Evolution Control or the Bryant 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.
Code 88-34 VFD Internal Fault - PFCM Sensor A
Code 88-74 VFD Lockout - PFCM Sensor A
The VFD has internal current measurement to protect PFC components
from exceeding current thresholds that may shorten the VFDs operating
life. If the PFCM Sensor A exceeds safe reliable value, the VFD will
shut down immediately and attempt a restart after 5 minute compressor
protection timer expires. Three occurrences of code 88-34 within a 4
hour period will result in 88-74 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 88-35 VFD Internal Fault - PFCM Sensor B
Code 88-75 VFD Lockout - PFCM Sensor B
The VFD has internal current measurement to protect PFC components
from exceeding current thresholds that may shorten the VFDs operating
life. If the PFCM Sensor B exceeds safe reliable value, the VFD will
shut down immediately and attempt a restart after 5 minute compressor
protection timer expires. Three occurrences of code 88-35 within a 4
hour period will result in 88-75 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 88-36 VFD Internal Fault - Line Volt Sens
Code 88-76 VFD Lockout - Line Volt Sensor
The VFD has internal voltage measurement to protect components from
operating outside of voltage thresholds that may shorten the VFDs
operating life. If the line volt sensor value is outside of safe reliable
range, the VFD will shut down immediately and attempt a restart after 5
minute compressor protection timer expires. Three occurrences of code
88-36 within a 4 hour period will result in 88-76 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.
