19
Table 6 – Troubleshooting
Flash Code Ty p e Amber LED Description
Reset
Time
Mode Possible Causes Actions
ON, no flash Standby
1, pause Variable Capacity
1,
(2 sec ON),
longer pause
(1 second OFF)
Variable Capacity (Range
Cutback)
25
System
Malfunction
INVALID MODEL PLUG/IN-
VERTER SIZE
NA Both
Wrong Model Plug
Installed
Verify correct model plug installed
Damaged Model
Plug
Check model plug for corr osion or break-
age; replace if necessary
Missing model plug
on service board
Re---installoriginalmodelplug
Damaged AOC con-
trol
Replace AOC control
Incorrect Model
Plug with Inverter
Size
Replaceplugorinverterwithcorrectsize
(If model plug is for 2 Ton but Inverter is 3
Ton, fault code 25 will be shown)
31 Local
HIGH PRESSURE SWITCH
OPEN
(stage/speed down for
each occurrence, el evates
to fault code 84 when it oc-
curs while running on the
lowest stage)
6Min-
utes
(then re-
duced
stage
opera-
tion)
Both High Pressure Event
System will self ---mitigate by reducing the
stage, persistent conditions will lead to
lockout (refer to E rror Code 84). 2 hours
of accumulated operation without further
fault will reset fau l t reduced stage opera-
tion.
32 Local
LOW PRESSURE TRIP
(elevates to fault code 83
after 3 occurrences)
6Min-
utes
Both Low Pressure Event
System will self ---mitigate, persistent con-
ditions will lead to lockout (refer to Err or
Code 83) 2 hours of accumulated opera-
tion without further fault will reset fault
counter
33 Local
LOST INVERTER COMMU-
NICAT IONS
(Occurs after 2 minutes of
no communications be-
tween AOC and MOC)
(Elevates to fault code 48
after 3 consecutive failures
within 20 minute or 20 min-
utes continuous loss of
connection)
6Min-
utes
Both
Loose or discon-
nected harness
(Hardness between
AOC (PL20) and
MOC)
Verify good harness connection
Radio or Electrical
noise
System will try to self---mitigate with re-
peated start attempts
Possible damage to
inverter
change out the Inverter drive
46 Local BROWNOUT EVENT
6Min-
utes
Both low line voltages if persistent contact power provider
48
System
Malfunction
LOST INVERTER COMMU-
NICAT IONS
(Elevated from fault code
33 after 3 occurrences)
6Min-
utes
Both
Loose or discon-
nected harness
(Hardness between
AOC (PL20) and
MOC)
Verify good harness connection
Radio or Electrical
noise
System will try to self---mitigate with re-
peated start attempts
Possible damage to
inverter
change out the Inverter drive
49 Local
COMPRESSOR OVER
CURRENT FAULT
(Elevates to fault code 95
after 3 occurrences)
6Min-
utes
Both
Refer to fault code
95
Refer to fault code 95
53 Fault
OUTDOOR AIR TEMP
SENSOR FAU LT
NA Both
Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Broken or Damaged
Sensor
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Hardware damage
to AOC control
Replace AOC control
54 Fault
SUCTION TEMP SENSOR
FAULT
NA Both
Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Suction Thermistor
not properly at-
tached or in wrong
location
Ensure Sensor is properly attached to the
accumulator entry ---tube
Broken or Damaged
Sensor
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Hardware damage
to AOC control
Replace AOC control
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