Service Manual

SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8
421 08 5600 02 15
Specifications subject to change wi thout notice.
48 System
Malfunction
LOST INVERTER
COMMUNICATIONS
(Elevated from fault
code 33 after 3
occurrences)
NA Both Loose/disconnected
harness (Hardness
between AOC (PL20)
and MOC)
Verify good harness connection
Radio or Electrical
noise
System will try to self- mitigate with repeated
start attempts
Possible damage to
inverter
change out the Inverter drive
49 Local COMPRESSOR OVER
CURRENT FAULT
(Elevates to fault code
95 after 5 occurrences)
6 Minutes Both Refer to fault code 95
53 Fault OUTDOOR AIR TEMP
SENSOR FA ULT
NA 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
Hardware damage to
AOC control
Replace AOC control
54 Fault SUCTION TEMP
SENSOR FA ULT
NA 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
Suction Thermistor
improperly attached
or in wrong location
Ensure Sensor is properly attached to the
accumulator entry- tube
Broken or Damaged
Sensor
Check harness for continuity; see resistance
chart to check resistance at given temperature
Hardware damage to
AOC control
Replace AOC control
55 Fault COIL TEMP SENSOR
FAUL T
NA 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
Coil Thermistor not
properly attached or
in wrong location
Ensure Sensor is properly clipped to the
distributor entry- tube
Broken or Damaged
Sensor
Check harness for continuity; see resistance
chart to check resistance at given temperature
Hardware damage to
AOC control
Replace AOC control
56 Event OAT- OCT
THERMISTOR OUT
OF RANGE
NA Cool Heating when
cooling is demanded
Check fuse on AOC control
Check wiring between AOC and reversing
valve
troubleshoot reversing valve
Inspect outdoor coil for obstructions
Both Coil Thermistor not
properly attached or
in wrong location
Ensure Sensor is properly clipped to the
distributor entry- tube
Outdoor Ambient
Temperature sensor
improperly installed
(sensor body may be
in contact with sheet
metal)
Properly install OAT sensor