Carrier TRANSICOLD VECTOR 8100, Operation & Service Manual, Page: 139 / 294

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SECTION 7
ALARM TROUBLESHOOTING
WARNING
!
APX Control System equipped units may start automatically at any time the START/RUN-OFF
switch is in the START/RUN position. Also, the unit may be fitted with two way communication
equipment that will allow starting of the unit from a remote location even though the switch is
in the OFF position.
WARNING
!
When performing service or maintenance procedures: ensure any two way communication is
disabled in accordance with the manufacturer’s instruction, ensure the START/RUN-OFF
switch is in OFF position and, whenever practical, disconnect the negative battery connection.
7.1 INTRODUCTION
This section provides guidance for troubleshooting alarms. The alarm light will be illuminated when there is at least
one alarm stored in the system. Instructions for reviewing the active alarm list are provided in
Section 3.15 while
instructions for reviewing the inactive alarm list are provided in Section 5.2.2 .
When an alarm occurs, look through both active and inactive alarm lists and make note of all alarms. Each alarm
begins with an A (active) or I (inactive) followed by an alarm number and description.
Alarms are listed in this guide by alarm number in ascending order. Alarms that are only activated during a Pretrip
will begin with a capital “P”.
Before beginning to actually troubleshoot an alarm, visually inspect the unit, in particular the area of the unit that is
causing a problem. In many cases the cause of the problem will be obvious once a visual inspection is performed.
For those cases where the cause of the problem is not obvious, this troubleshooting guide will be of assistance.
Troubleshooting should begin with the first alarm that appears in the active alarm list. The first alarm that appears
is the last alarm that was recorded. Other alarms in the list may have contributed to the occurrence of the first
alarm.
The items in the troubleshooting guide are listed in order of their likeliness of occurrence and ease of testing. We
recommend that you follow the order in which they are presented, however, there may be times when situations or
experience lead to the use of a different order. For example, if the trailer is loaded, condensing section checks
should be done first, even though some evaporator section checks may be listed before them.
When the cause of the problem is corrected, it is not necessary to continue through the remainder of the steps.
Some active alarms will inactivate themselves automatically once the cause has been corrected. Alarms that do
not inactivate themselves automatically must be cleared manually. (Refer to
Section 7.2 , Note 1)
When repairs are completed, run the unit through a Pretrip cycle and verify that no further active alarms occur.
Also, the inactive alarm list should be cleared so that there are no inactive alarms in memory when the unit leaves
the repair facility.
When working on the refrigeration system, an accurately calibrated manifold gauge set should always be installed,
set up to read compressor suction and discharge pressure. Compressor suction pressure is displayed under Unit
Data when in the Driver Mode. If in the Advance User Mode, compressor discharge pressure and temperature will
also be displayed.
In high or low ambient it may be necessary to cool or warm the refrigerated compartment temperature before per-
forming specific tests providing that the compartment is not loaded with temperature sensitive product.
WARNING
!
The alarm related troubleshooting procedures in this section are to be performed by properly
trained personnel only.