Carrier EVOLUTION 189BNV Service Manual page 20

Flash Code Type Amber LED Description
OUTDOOR AIR TEMP SEN-
53 Fault
SUCTION TEMP SENSOR
54 Fault
55 Fault
OAT ---OCT THERMISTOR
56 Event
57 Fault
Reset
Time
NA
SOR FAULT
NA
FAULT
COIL TEMP SENSOR
NA
FAULT
NA
OUT OF RANGE
SUCTION PRESSURE
NA
SENSOR FAULT
Mode Possible Causes
Sensor Harness not
connected to AOC
control
Broken or loose har-
ness wire
Both
Broken or Damaged
Sensor
Hardware damage to
AOC control
Sensor Harness not
connected to AOC
control
Broken or loose har-
ness wire
Suction Thermistor
Both not properly at-
tached or in wrong
location
Broken or Damaged
Sensor
Hardware damage to
AOC control
Sensor Harness not
connected to AOC
control
Broken or loose har-
ness wire
Coil Thermistor not
Both
properly attached or
in wrong location
Broken or Damaged
Sensor
Hardware damage to
AOC control
Heating when cool-
Cool
ing is demanded
Coil Thermistor not
properly attached or
in wrong location
Outdoor Ambient
Both
Temperature sensor
improperly installed
(sensor body may
be in contact with
sheet metal)
Sensor Harness not
connected to AOC
control
Broken or loose har-
ness wire
Both
Electrical short de-
stroyed Transducer
electronics electrical shorts and correct; replace trans-
Heat damage during
brazing
20
Actions
Ensure plug is connected to AOC control
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Replace AOC control
Ensure plug is connected to AOC control
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Ensure Sensor is properly attached to the
accumulator entry ---tube
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Replace AOC control
Ensure plug is connected to AOC control
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Ensure Sensor is properly clipped to the
distributor entry ---tube
Check harness for continuity; see resis-
tance chart to check resistance at given
temperature
Replace AOC control
Check fuse on AOC control
Check wiring between AOC and reversing
valve
troubleshoot reversing valve
Inspect outdoor coil for obstructions
Ensure Sensor is properly clipped to the
distributor entry ---tube
Properly install OAT sensor
Ensure plug is connected to AOC control
Check harness
Compare transducer reading to gauge
reading at service valve (see transducer
measurement chart); Check system for
ducer
Compare transducer reading to gauge
reading at service valve (see transducer
measurement chart); replace transducer