20
Flash Code Ty p e Amber LED Description
Reset
Time
Mode Possible Causes Actions
55 Fault
COIL 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
Coil Thermistor not
properly attached or
in wrong location
Ensure Sensor is properly clipped to the
distributor 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
56 Local
OA T---OCT THERMISTOR
OUT OF RANGE
NA
Both
Coil Thermistor not
properly attached or
in wrong location
Ensure Sensor is properly clipped to the
distributor entry ---tube
Outdoor Ambient
Temperature sensor
improperly installed
(sensor body may
be in contact with
sheet metal)
Properly install OAT sensor
Cool
Heating when cool-
ing is demanded
Check fuse on AOC control
Check wiring between AOC and rever sing
valve
troubleshoot r ever sing val ve
Inspect outdoor coil for obstructions
57 Fault
SUCTION PRES SURE
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
Electrical short de-
stroyed Transducer
electronics
Compare transducer reading to gauge
reading at service valve (see tra nsducer
measurement chart); Check system for
electrical shorts and correct; replace
transducer
Heat damage dur-
ing brazing
Compare transducer reading to gauge
reading at service valve (see tra nsducer
measurement chart); replace transducer
59 Local
DISCHARGE TEMP OUT
OF RANGE EVENT
(elevates to fault code 74
after 3 occurrences)
6Min-
utes
Both See f au l t 74 Same actions for 74
61 Local
FAN INVERTER FAULT
(elevates to fault code 76
after 5 occurrences)
6Min-
utes
Both
OFM failed to start
Tr oubleshoot outdoor fan motor & blade
and make sure they are working
Fan motor misalign-
ment
System will attempt to ru n again
See Fault 76 Same actions for 76
62 Local
FAN INVERTER TEMP
HIGH
(elevates to fault code 85
after 3 occurrences)
NA Both See faul t 85 Same actions for 85
63 Local
FAN INVERTER CURRENT
FAULT
(elevates to fault code 86
after 3 occurrences)
6Min-
utes
Both See f au l t 86 Same actions for 86
65 Local
D C V O LT S L OW --- S P E E D
LIMITING
NA Both
Low supply line volt-
age ( < 197 VAC)
Check supply voltage to ODU; if low con-
tact utility provider
Loosewireincon-
trol box area
Loosewire:checkforloosewireinODU
Inverter internal
damage
Replace Inverter
66 Local
OUTDOOR FAN DROPPED
OUT
6Min-
utes
Both
MOC is reporting
that OFM isn’t run-
ning
Tr oubleshoot outdoor fan motor and
make sure it is working
67 Local STATOR HEATER FAULT
6Min-
utes
Both
There is a demand
for stator heat but
MOC doesn’t detect
it
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
68 Event
10MINSTAGE2WARMUP
DELAY
10 Min-
utes
Both
High voltage power
cycle
No action
69
System
Malfunction
INVERTER/COMPRESSOR
INTERNAL FA ULT
15 Min-
utes
Both
Phase imbalance/
compressororin-
verter miswire
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
Flooded start Troubleshoot EXV & TXV
Incorrect refrigerant
charge
Check refrigerant amount
Inverter damage Replace inverter
Compressor dam-
age
Replace compressor
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