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Flash Code
Type
Amber LED Description
COMPRESSOR / INVERT-
System
88
Malfunction
(Elevated from fault code
79 after 5 occurrences)
OVER VOLTAGE EVENT
91
Local
(Elevates to fault code 97
INVERTER VDC ---OUT UN-
DER VOLTAGE EVENT (El-
92
Local
evates to fault code 96 after
System
95
(Elevated from fault code
Malfunction
49 after 5 occurrences)
VDC UNDER VOLTAGE
System
96
(Elevated from fault code
Malfunction
92 after 5 occurrences)
System
97
(Elevated from fault code
Malfunction
91 after 5 occurrences)
HIGH TORQUE EVENT
(Event will cause stage
98
Event
down and when stage is at
lowest level, will elevate to
Reset
Time
ER LOCKOUT
2 Hours
INVERTER VDC ---OUT
5 Minutes
after 5 occurrences)
5 Minutes
5 occurrences)
COMPRESSOR OVER
CURRENT LOCKOUT
2 Hours
LOCKOUT
2 Hours
VDC OVER VOLTAGE
LOCKOUT
2 Hours
NA
fault code 99)
Mode
Possible Causes
Blocked Inverter
Heat Exchanger
(fins)
Check Condenser (IDU in heating, ODU in
Condenser Airflow
too low or off
clean if necessary; Troubleshoot fan motor
Check Evaporator (IDU in cooling, ODU in
Both
Evaporator Airflow
too low or off
clean if necessary; Troubleshoot fan motor
High Load condi-
tions at cold ambient
heating or high am-
bient cooling
Inverter damage
Compressor is sud-
denly unloaded
Both
Refer to fault code 97
Both
Refer to fault code 96
Outdoor Airflow too
bris) and clean if necessary; Troubleshoot
Cool
low or off
Both
High superheat
Compressor is oper-
ating outside the al-
Both
Inverter will reduce speed to a lower stage
lowed operational
envelope
Incoming power sup-
ply voltage
Loose or incorrect
Check incoming power leads and leads to
wire connections
Both
Phase imbalance
Refrigerant over-
charge
Both
Inverter damage
Compressor internal
damage
Low supply line volt-
Check supply voltage to ODU; if low con-
age (< 197 VAC)
Both
Inverter internal
damage
High supply line volt-
Check supply voltage to ODU; if high con-
age (> 253 VAC)
Both
Inverter internal
damage
Compressor is oper-
ating outside the al-
Both
Inverter will reduce speed to a lower stage
lowed operational
envelope
Both
Refer to fault code 99
25
Actions
Check Inverter fins for debris and clean if
necessary
cooling) for clogging (ice or debris) and
and make sure it is working
heating) for clogging (ice or debris) and
and make sure it is working
Over charge: Check system charge
Replace inverter
Check that the service valves are fully
open
Check ODU coil for clogging (ice or de-
ODU fan motor and make sure it is work-
ing
Troubleshoot TXV
Troubleshoot EXV
Check suction pressure transducer and
suction temperature sensor
Check voltage versus unit rating plate for
allowable range
the compressor plug
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
Check refrigerant amount
Replace inverter
Replace compressor
tact utility provider
Replace Inverter
tact utility provider
Replace Inverter
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