24
Flash Code Ty p e Amber LED Description
Reset
Time
Mode Possible Causes Actions
86
System
Malfunction
FAN INVERTER CURRENT
LOCKOUT
(Elevated from fault code
63 after 3 occurrences)
5min-
utes
Both
Sudden supply volt-
age change
Investigate incoming voltage
Sudden load
change on fan/mo-
tor
Tr oubleshoot outdoor fan motor & blade
and make sure they are workin g. Check
harness and connectors
Inverter damage Replace inverter
88
System
Malfunction
COMPRESSOR / INVERT-
ER LOCKOUT
(Elevated from fault code
79 after 3 occurrences)
2Hours Both
Blocked Inverter
Heat Exchanger
(fins)
Check Inverter fins for debris and clean if
necessary
Condenser Airflow
too l ow or off
Check C on denser (IDU in h eating, ODU
in cooling) for clogging (ice or debris) and
clean if necessary; Troubleshoot Con-
denser fan motor and make sure it is
working
Evaporator Airflow
too l ow or off
Check Evaporator (IDU in cooling, ODU
in heating) for clogging (ice or debris)
and clean if necessary; T roubleshoot
Evaporator fan motor and make sure it is
working
High Load condi-
tions at cold ambi-
ent heating or high
ambient cooling
Over charge: Check system charge
Inverter damage Replace inverter
91 Local
INVERTER VD C ---OUT
OVER VOL TAGE EVENT
5Min-
utes
Both
Occurs when bus
voltage exceeds 410
VDC
Check operation of compressor
Compressor is sud-
denly unloaded
Check that the service valves are fully
open
Inverter damage Replace inverter
92 Local
I N V E R T E R V D C --- O U T U N -
DER VOLTAGE EVENT
5Min-
utes
Both
Occurs when bus
voltage falls below
220 VDC
Checkforinterruptioninmainpowersup-
ply
93 Local
230VAC UNDER VOLTAGE
EVENT
(elevates to fault code 96
after 3 occurrences)
5Min-
utes
Both
Occurs when in-
coming voltage is
less than 197 VAC
System will try to ride through voltage
spikes (possibly caused by weather
event) and self---recover in trip condition;
persistent over voltage rips will lead to
fault 96
94 Local
230VAC OVER V OLTAGE
EVENT
(elevates to fault code 97
after 5 occurrences)
5Min-
utes
Both
Occurs when in-
coming voltage is
more than 253 VAC
System will try to ride through voltage
spikes (possibly caused by weather
event) and self---recover in trip condition;
persistent over voltage trips will lead to
fault 97
95
System
Malfunction
COMPRESSOR OVER
CURRENT LOCKOUT
(Elevated from fault code
49 after 3 occurrences)
2Hours
Both High superheat
Troubleshoot TXV
Troubleshoot EXV
Check suction pressure transducer and
suction temperature sensor
Both
Compressor is oper-
ating outside the al -
lowed operational
envelope
Inverter will reduce speed to a lower
stage
Both
Incoming power
supply voltage
Check voltage versus unit ratin g plate for
allowable range
Loose or incorrect
wire connections
Check incoming power leads and leads
to the compressor plug
Phase imbalance
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
Outdoor Airflow too
low or off
Check ODU coil for clogging (ice or de-
bris) and clean if n ecessary; Tr oubleshoot
ODU fan motor and make sure it is work-
ing
Refrigerant over-
charge
Check refrigerant amount
Inverter damage Replace inverter
Compressor internal
damage
Replace compressor
96
System
Malfunction
VDC UNDER VOLTAGE
LOCKOUT
(Elevated from fault code
93 after 3 occurrences)
2Hours 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
97
System
Malfunction
VDC OVER VOLTAGE
LOCKOUT
(Elevated from fault code
94 after 3 occurrences)
2Hours Both
High supply line
voltage (> 253 VAC)
Check supply voltage to ODU; if high
contact utility provider
Inverter internal
damage
Replace Inverter
98 Local
HIGH TORQUE EVENT
(Event will cause stage
down and when stage is at
lowest level, will elevate to
faul t code 99)
NA Both
Compressor is oper-
ating outside the al -
lowed operational
envelope
Inverter will reduce speed to a lower
stage
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