
Software Revs 3,5,6,8,10, 12 Infinity /Evolution Troubleshooting (Rev. 2)
10-12-2006
11
Outdoor Unit Generated Fault Descriptions
Flash Code on Outdoor
Board
Fault Description User Interface Display Action
38TDB, YDB
598B, 698B
24ANA, 25HNA
187A, 180A,
286A, 288A
Original
Models
-A models
51 32 Low Pressure Switch
trip
LOW PRESS
SWITCH in fault
history
No display on
main screen
LOW PRESS
SWITCH OPEN
in fault history
No display on
main screen
Switch is monitored at all times.
These may show up due to
low-pressure trips in low
outdoor temperature
conditions.
52 31 High Pressure Switch
trip
HIGH PRESS
SWITCH in fault
history
No display on
main screen
HIGH PRESS
SWITCH OPEN
in fault history
not display on
main screen
High-pressure switch trip.
Check refrigerant charge and
coils for airflow restrictions.
3 53 Outside Temp Sensor OAT SENSOR
in fault history
SENSOR
ERROR shown
in place of the
OAT value on
the main screen
OUTDOOR AIR
TEMP SENSOR
FAULT in
history
SENSOR
ERROR shown
in place of the
OAT value on
the main scree
Ohm out sensor and check
wiring. Could also be an
indication of los of
communication with outdoor
unit.
4 55 Coil Temp Sensor COIL SENSOR
in fault history
No display on
main screen
COIL TEMP
SENSOR
FAULT in fault
history.
No display on
main screen
Ohm out sensor and check
wiring
34 56 Thermistor Range
Error
RANGE ERROR in fault history
No display on main screen
Improper relationship between
coil sensor and outdoor sensor.
Make sure outdoor sensor is
located outside cabinet. Ohm
out sensors and check wiring.
6 73 Contactor Shorted VC STANDBY
VOLTS in fault
history SYSTEM
MALFUNCTION
on main screen
CONTACTOR
SHORTED in
fault history
SYSTEM
MALFUNCTION
on main screen
Voltage sensed at run capacitor
when no call for compressor
operation. Could be due to
stuck contactor, of if contactor
is manually pushed in by
technician
NA 85 Low Stage Contactor
Open
Not applicable
to original
models
LOW
CONTACTOR
OPEN in fault
history SYSTEM
MALFUNCTION
on main screen
Compressor voltage not
detected when call for
operation and high voltage
exits
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