Carrier NEOS 100S - Troubleshooting Guide; Refrigeration Issues

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SECTION 6
TROUBLESHOOTING
WARNING
!
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.
CAUTION
!
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 Table 6–1. Suggested corrective actions for mechan-
ical type problems are listed under subject headings in Table 6–2.
Table 6–1 Alarm Indications
ALARM Description CORRECTIVE ACTION
Reference
Section
A00 No Malfunction All components functioning normally --
A01/A02/A03
-
Alternating
Alarm)
Low Pressure Switch Open
or
Unit undercharged 5.6.1
Liquid line filter-drier restricted 5.8.1
TXV strainer plugged with foreign material/ice. 5.12
TXV malfunction 5.12
Verify operation of evaporator fans. --
Failed switch 5.9.2
Inspect switch wiring
High Pressure Switch Open
or
Unit overcharged 5.6.1
Verify operation of condenser fan --
Non-condensables in system 5.7
Failed switch 5.9.2
Inspect switch wiring
Electrical Motor PTO Open
Electrical motor overheated
Verify wiring to motor overload
Check electrical motor brush condition, replace
if necessary.
Replace electric motor
A04
Compressor Clutch (CLHR)
Malfunction
Current draw of road clutch coil either high or
low
Replace
A06
Condenser Fan Motor (CFM)
high amp draw
Verify motor rotates freely / no obstructions --
Replace motor --