19
Flash
Code
ActionsPossible CausesMode
Reset
Time
Amber LED DescriptionTy p e
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 resistance
chart to check resistance at given temperature
Coil Thermistor not
properly attached or in
wrong location
Ensure Sensor is properly clipped to the dis-
tributor entry-tube
Broken or Damaged
Sensor
Check harness for continuity; see resistance
chart to check resistance at given temperature
Hardware damage to
AOC control
Replace AOC control
56 Local
OAT-OC T THERMISTOR OUT
OF RANGE
NA
Both
Coil Thermistor not
properly attached or in
wrong location
Ensure Sensor is properly clipped to the dis-
tributor entry-tube
Outdoor Ambient Tem-
perature sensor improp-
erly installed (sensor
body may be in contact
with sheet metal)
Properly install OAT sensor
Cool
Heating when cooling is
demanded
Check fuse on AOC control
Check wiring between AOC and reversing
valve
troubleshoot reversing valve
Inspect outdoor coil for obstructions
57 Fault
SUCTION PRESSURE
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
Electrical short
destroyed Transducer
electronics
Compare transducer reading to gauge reading
at service valve (see transducer measurement
chart); Check system for electrical shorts and
correct; replace transducer
Heat damage during
brazing
Compare transducer reading to gauge reading
at service valve (see transducer measurement
chart); replace transducer
59 Local
DISCHARGE TEMP OUT OF
RANGE EVENT
(elevates to fault code 74 after
5 occurrences)
15 Minutes Both See fault 74 Same actions for 74
61 Local
FAN INVERTER FAULT
(elevates to fault code 76 after
5 occurrences)
6 Minutes Both OFMfailedtostart
Troubleshoot outdoor fan motor & blade and
make sure they are working
Fan motor misalignment System will attempt to run 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 fault 85 Same actions for 85
63 Local
FAN INVERTER CURRENT
FAULT
(elevates to fault code 86 after
5 occurrences)
6 Minutes Both See fault 86 Same actions for 86
65 Local
DC VOLTS LOW - SPEED
LIMITING
NA Both
Low supply line voltage
(< 197 VAC)
Check supply voltage to ODU; if low contact
utility provider
Loose wire in control
box area
Loose wire: check for loose wire in ODU
Inverter internal
damage
Replace Inverter
66 Local
OUTDOOR FAN DROPPED
OUT
6 Minutes Both
MOC is reporting that
OFM isn't running
Troubleshoot outdoor fan motor and make
sure it is working
67 Local STATOR HEATER FAULT 6 Minutes Both
There is a demand for
stator heat but MOC
doesn't detect it
Check compressor winding resistance or mis-
wire of compressor leads at terminals U,V,W
68 Event
10 MIN STAGE 2 WARMUP
DELAY
10 Minutes Both
High voltage power cy-
cle
No action
69
System Mal-
function
INVERTER/COMPRESSOR
INTERNAL FAULT (elevates to
this fault code after 5 occur-
rences of itself)
15 Minutes Both
Phase imbalance/com-
pressor or inverter-
miswire
Check compressor winding resistance or mis-
wire of compressor leads at terminals U,V,W
Flooded start Troubleshoot EXV & TXV
Incorrect refrigerant
charge
Check refrigerant amount
Inverter damage Replace inverter
Compressor damage Replace compressor
71 Local
COMPRESSOR DROPPED
OUT
6 Minutes Both
MOC is reporting that
compressor isn't
running
Check compressor winding resistance or mis-
wire of compressor leads at terminals U,V,W
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