Bryant EVOLUTION V Installation Instructions Manual page 21

Flash Code Type
COMPRESSOR DROPPED
71 Local
SUCTION OVER TEMPER-
72 Local
(elevates to fault code 82
System
74
Malfunction
(Elevated from fault code
MAXIMUM POWER MODE
--- TEMP (Temporary RPM
75 Local
FAN INVERTER LOCKOUT
System
76
(Elevated from fault code
Malfunction
MAXIMUM POWER MODE
(Temporary RPM reduction
77 Local
COMPRESSOR/INVERTER
79 Local
(Elevates to fault code 88
Reset
Amber LED Description
Time
6 Min-
OUT utes
ATURE EVENT 15 Min-
utes
after 3 occurrences)
DISCHARGE TEMP OUT
OF RANGE LOCKOUT
2 Hours
59 after 3 occurrences)
NA
reduction or stage lower-
ing will result.)
2 Hours
61 after 5 occurrences)
--- COMP CURRENT
NA
or stage lowering will re-
sult.
FAULT 6 Min-
utes
after 3 occurrences)
Mode Possible Causes
MOC is reporting Check compressor winding resistance or
Both that compressor miswire of compressor leads at terminals
isn't running
Both See fault 82
Sensor Harness not
connected to AOC Ensure plug is connected to AOC control
control
Check harness for continuity; see resis-
Broken or loose
tance chart to check resistance at given
harness wire
Check harness for continuity; see resis-
Broken or Damaged
tance chart to check resistance at given
Sensor
Hardware damage
Both
to AOC control
Indoor Unit Airflow Troubleshoot indoor fan motor and make
too low or off
Outdoor Unit Airflow
too low or off
Reversing Valve By-
pass or Reversing
Valve not energized
High Load condi-
Cool
tions
Low Charge or Loss
of Charge at low
Heat
ambient heating
conditions
Expansion Device
Heat
Restriction
Check ODU coil for clogging (ice or de-
Outdoor Airflow too bris) and clean if necessary; Troubleshoot
ODU fan motor and make sure it is work-
low or off
Both Blocked Inverter
Check Inverter fins for debris and clean if
Heat Exchanger
(fins)
Application violates Consult Application Guideline for compli-
guideline
Fan blade bent/out
of balance
Fan blade restricted
Both
Check outdoor fan motor connectors and
Fan motor wiring
Fan motor
Inverter damage
Compressor is oper-
ating outside the al-
lowed operational
envelope
Incorrect refrigerant
charge
Check ODU coil for clogging (ice or de-
Both
Outdoor Airflow too bris) and clean if necessary; Troubleshoot
low or off ODU fan motor and make sure it is work-
Incoming power Check voltage versus unit rating plate for
supply voltage
Loose or incorrect Check incoming power leads and leads
wire connections
Compressor fails to
Both
start
21
Actions
U,V,W
Same actions for 82
temperature
temperature
Replace AOC control
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, har-
nesses); Trouble shoot the TXV
Power Cycle system, is EXV moving on
power up (audible)
ing
necessary
ance
Check outdoor fan blade
Check for ice build up
Check outdoor fan blade clearance
Check for ice build up
harness
Replace outdoor fan motor
Replace inverter
Inverter will reduce speed to a lower
stage
Check refrigerant amount
ing
allowable range
to the compressor plug
System will try to self ---mitigate with re-
peated start attempts