Service Manual

SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8
20 421 08 5600 02
Specifications subject to change wi thout notice.
86 System
Malfunction
FAN INVERTER CUR-
RENT LOCKOUT
5 minutes Both Sudden supply
voltage change
Investigate incoming voltage
(Elevated from fault
code 63 after 5
occurrences)
Restrictiononfan
rotation / motor
Troubleshoot outdoor fan motor & blade and
make sure they are working.
Intermittent harness
plug connection
Check harness and connectors. Make sure
there is a positive lock between the harness
and the board
Fan blade bent/out
of balance
Replace fan blade
Inverter damage Replace inverter
88 System
Malfunction
COMPRESSOR / IN-
VERTER LOCKOUT
(Elevated from fault
2Hours Both Blocked Inverter
Heat Exchanger
(fins)
Check Inverter fins for debris and clean if
necessary
code 79 after 5
occurrences)
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
CheckEvaporator(IDUincooling,ODUin
heating) for clogging (ice or debris) and clean if
necessary; Troubleshoot fan motor and make
sure it is working
High Load conditions
at cold ambient heat-
ing 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 Compressor is
suddenly unloaded
Check that the service valves are fully open
Refer to fault code 97
92 Local INVERTER VDC - OUT
UNDER VOLTAGE
EVENT (Elevates to
fault code 96 after 5
occurrences)
5 Minutes Both Refer to fault code 96
95 System
Malfunction
COMPRESSOR OVER
CURRENT LOCKOUT
(Elevated from fault
2Hours Cool Outdoor Airflow too
low or off
Check ODU coil for clogging (ice or debris)
and clean if necessary; Troubleshoot ODU f an
motor and make sure it is working
code 49 after 5
occurrences)
Both High superheat Troubleshoot TXV
Troubleshoot EXV
Check suction pressure transducer and suction
temperature sensor
Both Compressor is
operating 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
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
Both Refrigerant
overcharge
Check refrigerant amount
Inverter damage Replace inverter
Compressor internal
damage
Replace compressor
96 System
Malfunction
VDC UNDER
VOLTAGE LOCKOUT
(Elevated from fault
2Hours Both Low supply line
voltage (< 197 VAC)
Check supply voltage to ODU; if low contact
utility provider
code 92 after 5
occurrences)
Inverter internal
damage
Replace Inverter