CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL
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22
86
System
Malfunction
FAN INVERTER
CURRENT LOCKOUT
(Elevated from fault code
63 after 5 occurrences)
5 minutes Both
Sudden supply
voltage change
Investigate incoming voltage
Restriction on fan
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 /
INVERTER LOCKOUT
(Elevated from fault code
79 after 5 occurrences)
2 Hours Both
Blocked Inverter Heat
Exchanger (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 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
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 code
49 after 5 occurrences)
2 Hours
Cool
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 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
Table 10 – Fault Code Actions (Continued)
Flash
Code
Type
AMBER LED
DESCRIPTION
Reset Time Mode Possible Causes Actions
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