Service Manual

SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8
18 421 08 5600 02
Specifications subject to change wi thout notice.
76 System
Malfunction
FAN INVERTER
LOCKOUT
2Hours Both Fan blade bent/out
of balance
Check outdoor fan blade
Check for ice build up
(Elevated from fault
code 61 after 5
occurrences)
Fan blade restricted Check outdoor fan blade clearance
Check for ice build up
F an motor wiring Check outdoor fan motor connectors and
harness
F an motor Replace outdoor fan motor
Inverter damage Replace inverter
77 Local MAXIMUM POWER
MODE - COMP
CURRENT
(Temporary RPM
NA Cool Overcharged System Check system sub - cooling to determine
charge status, if high remove charge using
Charging Mode (follow proper charging
procedures)
reduction or stage
lowering will result)
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 Compressor is
operating outside the
allowed operational
envelope
Inverter will reduce speed to a lower stage
Incorrect refrigerant
charge
Check refrigerant amount
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
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
79 Local COMPRESSOR/
INVERTER FA ULT
(Elevates to fault code
88 after 5 occurrences)
6 Minutes Both Compressor fails to
start
System will try to self- mitigate with repeated
start attempts
Refer to fault code 88
82 System
Malfunction
SUCTION OVER
TEMP LOCKOUT
(Elevated from fault
4Hours Cool Undercharged
System
Check system subcooling to determine charge
status, if low add charge using Charging Mode
(follow proper charging procedures)
code 72 after 3
occurrences)
Cool Uninsulated vapor
line
Insulate the vapor line
Cool Indoor TXV operation Troubleshoot TXV
Heat Undercharged
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
Heat Outdoor EXV
operation
Troubleshoot EXV
Both Reversing valve
bypass
Troubleshoot reversing valve
83 System
Malfunction
LOW PRESSURE
LOCKOUT FOR 4
HOURS
4Hours Cool Service Valve left
closed (Liquid or
Vapor)
Ensure Service Valves are open
(Elevated from fault
code 32 after 3
occurrences)
Cool Undercharged
System
Check system sub - cooling to determine
charge status, if low add charge using
Charging Mode (follow proper charging
procedures)
Cool Indoor Airflow too
low or off
Check Indoor for clogging (ice or debris) and
clean or de- ice if necessary; Troubleshoot
Indoor fan motor and make sure it is working;
follow Indoor Airflow troubleshooting instruction
Cool Restriction in Circuits
or Tubing
Repair restriction
Heat EXV Malfunction Troubleshoot EXV (see guide below)
Heat Service Valve left
closed (Liquid
Service Valve)
Ensure Liquid Service Valve is open