Bryant 189BNV EVOLUTION Service Manual page 20

Flash
Type Amber LED Description
Code
SUCTION OVER TEMPERA-
72 Local
(elevates to fault code 82 after
DISCHARGE TEMP OUT OF
System
RANGE LOCKOUT
74
Malfunction
(Elevated from fault code 59 af-
ter 5 occurrences)
MAXIMUM POWER MODE -
75 Local
(Temporary RPM reduction or
stage lowering will result.)
FAN INVERTER LOCKOUT
System
(Elevated from fault code 61
76
Malfunction
after 5 occurrences)
MAXIMUM POWER MODE -
COMP CURRENT
77 Local
(Temporary RPM reduction or
stage lowering will result.
COMPRESSOR/INVERTER
79 Local
(Elevates to fault code 88 after
SUCTION OVER TEMP
System Mal-
82
function (Elevated from fault code 72 af-
ter 3 occurrences)
Reset
Time
TURE EVENT
15 Minutes
3 occurrences)
2 Hours
TEMP
NA
2 Hours
NA
FAULT
6 Minutes
5 occurrences)
LOCKOUT
4 Hours
Mode Possible Causes
Both See fault 82
Sensor Harness not
connected to AOC
control
Broken or loose
harness wire chart to check resistance at given temperature
Broken or Damaged
Sensor chart to check resistance at given temperature
Hardware damage to
AOC control
Both
Indoor Unit Airflow too
low or off
Outdoor Unit Airflow too
low or off
Reversing Valve By-
pass or Reversing
Valve not energized
Cool High Load conditions
Low Charge or Loss of
Heat Charge at low ambient
heating conditions
Expansion Device
Heat
Restriction
Outdoor Airflow too low
and clean if necessary; Troubleshoot ODU fan
or off
Blocked Inverter Heat
Both
Exchanger (fins)
Application violates
guideline
Fan blade bent/out of
balance
Fan blade restricted
Both
Fan motor wiring
Fan motor
Inverter damage
Compressor is operat-
ing outside the allowed
operational envelope
Incorrect refrigerant
charge
Outdoor Airflow too low
Both
and clean if necessary; Troubleshoot ODU fan
or off
Incoming power supply
voltage
Loose or incorrect wire
connections
Compressor fails to
Both
start
Incorrect refrigerant
Both
charge
Cool Uninsulated vapor line
Cool Indoor TXV operation
Heat Outdoor EXV operation
Both Reversing valve bypass
20
Actions
Same actions for 82
Ensure plug is connected to AOC control
Check harness for continuity; see resistance
Check harness for continuity; see resistance
Replace AOC control
Troubleshoot indoor fan motor and make sure
it is working
Troubleshoot outdoor fan motor and make
sure it is working
Reversing Valve stuck halfway
Ensure AOC fuse is good
24 VDC in cooling mode
Check harness and connectors
Over charge: Check system charge
Undercharged or No charge: check charge
Heating: Trouble shoot EXV (coil, harnesses);
Trouble shoot the TXV
Power Cycle system, is EXV moving on power
up (audible)
Check ODU coil for clogging (ice or debris)
motor and make sure it is working
Check Inverter fins for debris and clean if nec-
essary
Consult Application Guideline for compliance
Check outdoor fan blade
Check for ice build up
Check outdoor fan blade clearance
Check for ice build up
Check outdoor fan motor connectors and har-
ness
Replace outdoor fan motor
Replace inverter
Inverter will reduce speed to a lower stage
Check refrigerant amount
Check ODU coil for clogging (ice or debris)
motor and make sure it is working
Check voltage versus unit rating plate for
allowable range
Check incoming power leads and leads to the
compressor plug
System will try to self-mitigate with repeated
start attempts
Check refrigerant amount
Insulate the vapor line
Troubleshoot TXV
Troubleshoot EXV
troubleshoot reversing valve