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28
T
ROUBLESHOOTING
Fault Display on Cab Command
AL0 ENG OIL
Low engine oil pressure condition. Check
engine oil level.
AL1 ENG HOT The engine has overheated. Check the
coolant level, belts, and radiator coil for air
restriction.
AL2 HI PRESS High compressor discharge pressure.
Check all belts, check condenser coil for
airflow obstruction and cleanliness
AL3 START-
FAIL
The engine has failed to start. Check bat-
tery, fuses and fuel level.
AL4 LOW
BATT
The battery voltage has fallen below 10
VDC. Check battery.
AL5 HI BATT
The battery voltage is above 10 VDC.
Check battery.
AL6 DEFR
FAIL
The unit is in a defrost override mode.
AL7 ALT AUX
The alternator signal is not present with
the engine running or with the standby
electric mode active. Check alternator.
AL8 STARTER The starter motor input signal is not pres-
ent with the starter solenoid output on.
Check starter solenoid.
AL9 RA
SENSOR
The return air sensor is not working and
the unit has shut down. Check probe.
AL10 SA
SENSOR
The supply air sensor has been chosen in
the functional parameters and is not work-
ing.
AL11 WT
SENSOR
The coolant temperature sensor is not
working.
AL12 HIGH CDT The discharge temperature is above 310
°
F
or 340
°
F if ambient temperature is above
120
°
F.
AL13 CD
SENSOR
The discharge sensor is not working.
AL14 SBY
MOTOR
The standby motor is overloaded.
AL15 FUSE
BAD
One of the fuses has low input. Check
fuses.