Carrier Infinity 25VNA8 - Page 25

25
Flash Code ActionsPo ssible CausesMode
Reset
Time
Amber LED DescriptionTy pe
88
System
Malfunction
COMPRESSOR / INVERT-
ER LOCKOUT
(Elevated from fault code
79 after 5 occurrences)
2Hours Both
Blocked Inverter
Heat E xchanger
(fins)
Check Inverter fins for debris and clean if
necessary
Condenser Airflow
too low or off
Check Condenser (IDU in heating, ODU in
cooling) for clogging (ice or debris) and
clean if necessary; Troubleshoot 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 fan motor
and make sure it is working
High Load condi-
tions at cold ambient
heating or high am-
bient 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
Compressor is sud-
denly unloaded
Check that the service valves are fully
open
Refer to fault code 97
92 Local
I N V E R T E R V D C --- O U T U N -
DER VOLTAGE EVENT (El-
evates to fau l t code 96 after
5 occurrences)
5 Minutes Both Refer to fault code 96
95
System
Malfunction
COMPRESSOR OVER
CURRENT LOCKOUT
(Elevated from fault code
49 after 5 occurrences)
2Hours
Cool
Outdoor Airflow too
low or off
Check ODU coil for clogging (ice or de-
bris) and clean if necessary; Troubleshoot
ODU fan motor an d make sure it is work-
ing
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 sup-
ply voltage
Check voltage versus unit rating plate for
allowable range
Loose or incorrect
wire connections
Check incoming power l eads and leads to
the compressor plug
Phase imbalance
Check compressor winding resistance or
miswire of compressor leads at terminals
U,V,W
Both
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
92 after 5 occurrences)
2Hours Both
Low supply line volt-
age (< 197 VAC )
Check supply voltage to ODU; if low con-
tact utility provider
Inverter internal
damage
Replace Inverter
97
System
Malfunction
VDC OVER VOLTAGE
LOCKOUT
(Elevated from fault code
91 after 5 occurrences)
2Hours Both
High supply line volt-
age (> 253 VAC )
Check supply voltage to ODU; if high con-
tact utility provider
Inverter internal
damage
Replace Inverter
98 Event
HIGH TORQUE EVENT
(Event will cause stage
down an d 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
Both Refer to fault code 99