23
Flash
Code
ActionsPossible CausesMode
Reset
Time
Amber LED DescriptionTy p e
88
System Mal-
function
COMPRESSOR / INVERTER
LOCKOUT
(Elevated from fault code 79 af-
ter 5 occurrences)
2 Hours Both
Blocked Inverter Heat
Exchanger (fins)
Check Inverter fins for debris and clean if nec-
essary
Condenser Airflow too
low or off
Check Condenser (IDU in heating, ODU in
cooling) for clogging (ice or debris) and clean if
necessary; Troubleshoot Condenser fan motor
and make sure it is working
Evaporator Airflow too
low or off
Check Evaporator (IDU in cooling, ODU in
heating) for clogging (ice or debris) and clean if
necessary; Troubleshoot Evaporator fan motor
and make sure it is working
High Load conditions at
cold ambient heating or
high ambient cooling
Over charge: Check system charge
Inverter damage Replace inverter
91 Local
INVERTER VDC-OUT OVER
VOLTAGE EVENT
(Elevates to fault code 97
after 5 occurrences)
5 Minutes Both
Occurs when bus volt-
age exceeds 410 VDC
Check operation of compressor; persistent
over voltage trips will lead to fault 97
Compressor is
suddenly unloaded
Check that the service valves are fully open
Inverter damage Replace inverter
92 Local
INVERTER VDC-O UT UNDER
VOLTAGE EVENT (Elevates
to fault code 96 after 5 occur-
rences)
5 Minutes Both
Occurs when bus volt-
age falls below 220
VDC
Check for interruption in main power supply;
persistent over voltage rips will lead to fault 96
93 Local
230VAC UNDER VOLTAGE
EVENT
5 Minutes Both
Occurs when incoming
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
94 Local
230VAC OVER VOLTAGE
EVENT
5 Minutes Both
Occurs when incoming
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
95
System
Malfunction
COMPRESSOR OVER CUR-
RENT LOCKOUT
(Elevated from fault code 49 af-
ter 5 occurrences)
2 Hours
Both High superheat
Troubleshoot TXV
Troubleshoot EXV
Check suction pressure transducer and suc-
tion temperature sensor
Both
Compressor is operat-
ing outside the allowed
operational envelope
Inverter will reduce speed to a lower stage
Both
Incoming power
supply voltage
Check voltage versus unit rating plate for al-
lowable range
Loose or incorrect wire
connections
Check incoming power leads and leads to the
compressor plug
Phase imbalance
Check compressor winding resistance or mis-
wire of compressor leads at terminals U,V,W
Outdoor Airflow too low
or off
Check ODU coil for clogging (ice or debris)
and clean if necessary; Troubleshoot ODU fan
motor and make sure it is working
Refrigerant overcharge Check refrigerant amount
Inverter damage Replace inverter
Compressor internal
damage
Replace compressor
96
System
Malfunction
VDC UNDER VOLTAGE
LOCKOUT
(Elevated from fault code 92 af-
ter 5 occurrences)
2 Hours 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
97
System
Malfunction
VDC OVER VOLTAGE LOCK-
OUT
(Elevated from fault code 91 af-
ter 5 occurrences)
2 Hours 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 fault code
99
NA Both
Compressor is operat-
ing outside the allowed
operational envelope
Inverter will reduce speed to a lower stage
Both Refer to 99 Refer to 99
99
System
Malfunction
HIGH TORQUE LOCKOUT
(Elevated from fault code 98
when 98 occurs at lowest
stage)
2 hours
Both Mi swire
Check miswire of compressor leads at termi-
nals U,V,W
Both
Refrigerant
overcharge
Check refrigerant amount
Both
Outdoor Airflow too low
or off
Check ODU coil for clogging (ice or debris)
and clean if necessary; Troubleshoot ODU fan
motor and make sure it is working
Both
Expansion Device
Restriction
Troubleshoot TXV
Troubleshoot EXV
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