Service Manual

SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8
421 08 5600 02 21
Specifications subject to change wi thout notice.
97 System
Malfunction
VDC OVER VOLTAGE
LOCKOUT
(Elevated from fault
2Hours Both High supply line volt-
age (> 253 VAC)
Check supply voltage to ODU; if high contact
utility provider
code 91 after 5
occurrences)
Inverter internal
damage
Replace Inverter
98 Event HIGH TORQUE
EVENT
(Event will cause stage
down and when stage
is at lowest level, will
elevate to fau lt code
99)
NA Both Compressor is
operating outside the
allowed operational
envelope
Inverter will reduce speed to a lower stage
Both Ref er to fault code 99
99 System
Malfunction
HIGH TORQUE
LOCKOUT
(Elevated from fault
2hours Cool Overcharged System Check system subcooling to determine charge
status, if high remove charge using Charging
Mode (follow proper charging procedures)
code 98 when 98
occurs at lowest stage)
Heat Overcharged System Check charge in heating mode per heating
check charge chart. If pressures do not match
then pull out charge, weigh in using heating
charge method
Both Mis- wire Check mis- wire of compressor leads at
terminals U,V,W
Both 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
Both Expansion Device
Restriction
Troubleshoot TXV
Troubleshoot EXV
Heat Overcharged System Check charge in heating mode per heating
check charge chart. If pressures do not match
then pull out charge, weigh in using heating
charge method