24VNA6 / 25VNA4: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Code 81-13 VFD System Fault - PFC
Code 81-53 VFD System Lockout - PFC
The power factor correction circuit (PFC) in VFD introduces an
inductance which corrects the current phase shift inherent with powering
motors. This in turn minimizes the reactive power transmitted back to
input power cables. This fault is set when the PFC circuit exceeds a peak
current limit when driving compressor. System will shut down and VFD
will reset, if demand persists, system will attempt to resume normal
operation. After 2 occurrences within 10 minutes, code 81-53 is set and
system is locked out for 4 hours. A power cycle will clear malfunction
lockout timer. Continued malfunctions indicate high current situation.
This is likely due to VFD or compressor damage. Measure reactor(s)
resistance. As reactor charges the resistance will be reduced to 0. If
measurement is open, replace reactor. Otherwise replace VFD.
Code 81-14 VFD System Fault - Unbalanced PFCM
Code 81-54 VFD System Lockout - Unbalance PFCM
Applicable to 4 and 5 ton models only with multiple reactors. This fault
occurs when current in PFCM circuits is not balanced. It is most likely
caused by a disconnected or faulty reactor. The VFD will shut down and
attempt to restart after each occurrence of code 81-14. After 2
occurrences within 10 minutes, code 81-54 is set and system is locked
out for 4 hours.
Disconnect and measure resistance of both reactors in system. As reactor
charges the resistance will be reduced to 0. If measurement is open,
replace reactor. Otherwise replace VFD.
Code 81-58 VFD System Lockout - Wiring Error
This fault occurs when the VFD senses that 1 or more of the compressor
wires are not connected to VFD. While this fault is active the system is
inoperable. Check compressor wire harness at each end and ensure
connections are tight fitting and wires are undamaged. Perform
continuity test on compressor harness with DMM. Check resistance of
compressor windings at VFD end of compressor harness to ensure no
windings are open. Refer to
for compressor winding resistance
by outdoor model.
Code 82-11 VFD System Fault - Line Current Lim
The VFD monitors input current and will limit or reduce compressor
speed if the current rises above threshold. Current limits are model
specific. While code 82-11 is active the VFD will continue to operate
compressor at a reduced or limited speed, while fan operation will not be
affected directly. This code will clear once VFD input current drops
below threshold. Low input voltage combined with high load is the most
likely cause of this code. Check system for overcharge and
indoor/outdoor coil blockage as well as input voltage.
Code 82-13 VFD Reset with Power Dropout
Code 82-53 VFD Lockout - Reset with Power Drop
This code indicates the VFD has reset itself due to a line voltage loss.
When this code is set the PCM will complete a shutdown, reset the VFD,
and restart if demand is still present. The system should resume
operation after the 5 minute compressor protection time delay expires. 3
occurrences of code 82-13 within a 1 hour period will result in a code
82-53 and 2 hour lockout. Occasional occurrences of this code may
happen due to momentary power loss or electrical noise from utility.
Check tightness of all line voltage connections. Loose connections can
cause momentary voltage drop due to vibration and trigger this fault. If
all connections are tight, additional steps involving the local power
utility or addition of external power conditioner may be required.
Code 82-15 VFD Fault with Power Dropout
Code 82-55 VFD Lockout - Fault with Power Drop
This code indicates the VFD has shutdown due to a line voltage loss.
When this code is set the PCM reset the VFD, and restart if demand is
still present. The system should resume operation after 5 minute
compressor protection time delay expires. 4 occurrences of code 82-15
within a 1 hour period will result in a code 82-55 and 2 hour lockout.
Occasional occurrences of this code may happen due to momentary
power loss or electrical noise from utility. This code can be paired with
other codes if electrical noise is present. Check tightness of all line
voltage connections. Loose connections can cause momentary voltage
drop due to vibration and trigger this fault. If all connections are tight,
additional steps involving the local power utility or addition of external
power conditioner may be required.
Code 82-16 VFD System Fault - Low Line Volt
Code 82-56 VFD System Lockout - Low Line Volt
The VFD monitors line voltage and will set code 82-16 if line voltage
drops below 180VAC peak. When code 82-16 occurs the system will
shut down and reset VFD. System will attempt to resume operation once
5 minute compressor protection timer expires. 4 occurrences of code
82-16 in a 1 hour period will result in code 82-56 and will shut down
equipment for a 2 hour lockout. Measure input voltage with a power
quality analyzer and contact power utility provider if necessary.
Code 82-17 VFD System Fault - High Line Volt
Code 82-57 VFD System Lockout - High Line Volt
The VFD monitors line voltage and will set code 82-17 if line voltage
rises above 410VAC peak. When code 82-17 is occurs the system will
remain operating as it is likely caused by a momentary voltage spike that
will not damage the VFD. If a long term unsafe high voltage event
occurs, the PCM will generate a 15-94 and shut down equipment. 10
events of code 82-17 in a 1 hour period will result in code 82-57 and will
shut down equipment for a 2 hour lockout. Measure input voltage with a
power quality analyzer and contact power utility provider if necessary.
Code 83-11 VFD Compressor Fault - Current 1
Code 83-12 VFD Compressor Fault - Current 2
The VFD monitors multiple compressor current conditions and will limit
or reduce compressor speed if the current rises above threshold. Current
limits are model specific. While codes are active the VFD will continue
to operate compressor at a reduced or limited speed, and fan operation
will not be affected directly. This code will clear once compressor
current drops below threshold. This code indicates the compressor may
have minor damage and requires slightly higher torque (current) to
operate at desired rpm. If damage continues to worsen the compressor
may cause code 83-15, 83-55, 83-16, and 83-56. Check system for
overcharge and indoor/outdoor coil blockage as well as input voltage.
Listen to compressor during operating for abnormal noise indicating
physical damage. If code persists or compressor has abnormal noise,
replace compressor.
Code 83-15 VFD Compressor Fault - Current 3
Code 83-55 VFD Compressor Lockout - Current 3
Code 83-16 VFD Compressor Fault - Current 4
Code 83-56 VFD Compressor Lockout - Current 4
The VFD monitors multiple compressor current conditions and will limit
or reduce compressor speed if the current rises above threshold. Current
limits are model specific. Code 83-15, 83-16, 83-55, and 83-56 will
result if the VFD is not capable of reducing compressor speed far enough
or fast enough while running. This code will shut down system and
attempt restart after 5 minute compressor protection timer has expired. 2
instances of code 83-15/83-16 in a 4 hour period will result in code
83-55/83-56 and a 2 hour lockout. These codes indicate the compressor
requires higher torque (current) to operate at desired rpm. Check system
for overcharge and indoor/outdoor coil blockage as well as input voltage.
Check wiring from VFD to compressor for poor connections causing
high current. Check compressor winding resistance against table. Listen
to compressor during operating for abnormal noise indicating physical
damage. VFD may have internal damage causing high current, or
compressor may be damaged.
