Troubleshooting; Introduction; Table 6-1 Alarm Indications - Carrier Neos 100S Operation & Service Manual

Beware of unannounced starting of the unit. The unit may cycle the fans and operating com-
pressor unexpectedly as control requirements dictate. Press OFF key on the Cab Command
and turn vehicle engine off.
Under no circumstances should anyone attempt to service the microprocessor module and
Cab Command. Should a problem develop with the control system, contact your nearest Car-
rier Transicold dealer for replacement components.
6.1

INTRODUCTION

Under normal circumstances, unit problems will be indicated by an active alarm in the alarm list. Suggested trou-
bleshooting actions for each alarm indication are provided in
ical type problems are listed under subject headings in
ALARM
A00 No Malfunction
Low Pressure Switch Open
A01/A02/A03
-
High Pressure Switch Open
Alternating
Alarm)
Electrical Motor PTO Open
Compressor
A04
Malfunction
Condenser Fan Motor (CFM)
A06
high amp draw
SECTION 6

TROUBLESHOOTING

!
!
Table 6–1 Alarm Indications
Description
All components functioning normally
Unit undercharged
Liquid line filter-drier restricted
TXV strainer plugged with foreign material/ice.
TXV malfunction
or
Verify operation of evaporator fans.
Failed switch
Inspect switch wiring
Unit overcharged
Verify operation of condenser fan
Non-condensables in system
or
Failed switch
Inspect switch wiring
Electrical motor overheated
Verify wiring to motor overload
Check electrical motor brush condition, replace
if necessary.
Replace electric motor
Clutch (CLHR) Current draw of road clutch coil either high or
low
Verify motor rotates freely / no obstructions
Replace motor
WARNING
CAUTION
Table 6–1. Suggested corrective actions for mechan-
Table 6–2.
CORRECTIVE ACTION
6-1
Reference
Section
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5.6.1
5.8.1
5.12
5.12
--
5.9.2
5.6.1
--
5.7
5.9.2
Replace
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62-11848