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3.8.1
Accessing Alarm Messages
1. Press the SET key for 5 seconds. This enables access to the alarm messages.
2. In the event of more than one alarm, press the + or - keys to display them.
3. To scroll through the alarm list, use the + key.
3.8.2
Clearing Passive Alarms and the Maintenance Interval Message SE
1. While displaying either the P** alarm or the SE message, press simultaneously the +, -, and SET keys. The
passive alarms will clear or the service hourmeter will reset.
3.8.3
Low Battery Voltage Alarms
There is a 40 second time delay during start-up. After this delay if the battery voltage drops below 10.5V ± 0.5V, the
microprocessor will react 20 seconds later and the unit will go out of temperature control mode. The microproces-
sor will check the voltage after another 20 seconds. If battery voltage still has not risen, the unit will remain out of
temperature control mode for another 10 minutes, the battery alarm will be activated and the Cab Command will
display the message “bAt”. The unit will return to temperature control mode if battery voltage has risen after 10 min-
utes. If the battery voltage has not risen after this 10 minute period, the unit will remain out of temperature control
mode another 2 minutes and the microprocessor will check the battery voltage every 2 minutes. The unit will return
to temperature control mode in its current configuration when battery voltage rises to 10.5V ± 0.5V.
3.9
CHECKING THE SOFTWARE VERSION AND HOURMETER
1. Start up the unit.
2. Press the SET key for 5 seconds.
3. Press the SET key again to display the EEPROM version number.
4. Press the SET key again to display the hourmeter.
5. Press the SET key to return to box temperature.
Table 3–1 Malfunctions
Code
Description
Unit
Shutdown
A00
No malfunction - unit in operation
No
A01/A02/A03
Low pressure switch open / High pressure switch open /
DC electrical motor over heated (displayed alternatively)
Yes
A04
Clutch compressor fault
No
A06
Condenser fan fault
No
A07
Evaporator fan relay fault
No
A09
Defrost valve (HGS1) fault
No
A11
Main heat valve (HGS2) fault
No
A12
High temperature alarm
No
A13
Low temperature alarm
No
A14
Defrost alarm > 45 minutes
No
A15
Setpoint adjusted out of the range -20°F (-29°C) to + 86°F (30°C)
Yes
EE
Evaporator temperature probe (open circuit)
Yes
b A t
Battery low voltage alarm
Yes
S E
Maintenance needed. This is a maintenance alarm that occurs
every 1000 hours. Refer to
for more information.
No
