Service Manual

SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8
421 08 5600 02 17
Specifications subject to change wi thout notice.
69 System
Malfunction
INVERTER/COMPRES-
SOR INTERNAL FAULT
(Elevatestothisfault
code after 5 hidden
occurrences of itself)
15 Minutes Cool Overcharged System Check system sub- cooling to determine
charge status, if high remove charge using
Charging Mode (follow proper charging
procedures)
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 Phase imbalance/
compressor or
inverter mis- wire
Check compressor winding resistance or
mis- wire of compressor leads at terminals
U,V,W
Flooded start Troubleshoot EXV & TXV
Inverter damage Replace inverter
Compressor damage Replace compressor
71 Event COMPRESSOR
DROPPED O UT
6 Minutes Both MOC is reporting
that compressor isn’t
running
Refer to TIC 2015- 0017 for more details
3T Inverter enters
test mode
Replace inverter with latest software
72 Local SUCTION OVER
TEMPERATURE
EVENT
(elevates to fault code
82 after 3 occurrences)
15 Minutes Both Refer to fault code 82
74 System
Malfunction
DISCHARGE TEMP
OUT OF RANGE
LOCKOUT
2Hours Cool High Load conditions Over charge: Check system charge
(Elevated from fault
code 59 after 5
occurrences)
Heat Low Charge or Loss
of Charge at low
ambient heating
conditions
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 Expansion Device
Restriction
Heating: T rouble shoot EXV (coil, harnesses);
Trouble shoot the TXV
Power Cycle system, is EXV moving on power
up (audible)
Both Sensor Harness not
connected to AOC
control
Ensure plug is connected to AOC control
Broken or loose
harness wire
Check harness for continuity; see resistance
chart to check resistance at given temperature
Broken or Damaged
Sensor
Check harness for continuity; see resistance
chart to check resistance at given temperature
Indoor Unit Airflow
too low or off
Troubleshoot indoor fan motor and make sure
it is working
Outdoor Unit Airflow
too low or off
Troubleshoot outdoor fan motor and make sure
it is working
Reversing Valve
Bypass or Reversing
V alve not energized
Reversing Valve stuck halfway
Ensure AOC fuse is good
24 VDC in cooling mode
Check harness and connectors
Both Hardware damage to
AOC control
Replace AOC control
Both Nuisance fault during
non- operational
mode
Refer to TIC 2015- 0017 for more details
75 Local MAXIMUM POWER
MODE - TEMP
NA Heat Indoor Airflow too
low or off
Check indoor airflow
(Temporary RPM
reduction or stage
lowering will result)
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
Blocked Inverter
Heat Exchanger
(fins)
Check Inverter fins for debris and clean if
necessary
Application violates
guideline
Consult Application Guideline for compliance