Troubleshooting; Introduction; Table 3-1 Alarm Indications - Carrier 40 Operation & Service Manual

Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor
unexpectedly as control requirements dictate. To ensure unit will not start, place the EMERGENCY
SWITCH (see Figure 1-1) in the OFF position. To ensure unit is without power, remove power plug and
remove battery negative cable.
Under no circumstances should anyone attempt to service the microprocessor (see section 4.17).
Should a problem develop with the microprocessor, contact your nearest Carrier Transicold dealer for
replacement.

3.1 INTRODUCTION

Under normal circumstances, unit problems will be indicated by an active or inactive alarm in the alarm list. Suggested
troubleshooting actions for each alarm indication are provided in Table 3-1. Suggested corrective actions for
mechanical type problems are listed under subject headings in Table 3-2.
ALARM Description
A00 No Malfunction
A01 Low Pressure Switch (LPS)
Open (Road) O (R d)
A02 High Pressure Switch (HP1) g
O Open
A03 Standby Compressor Thermal y
Overload (PTC) open O l d (PTC)
A04 Road Compressor Clutch
(CLHR) Malfunction
A05 Standby Contactor (MC)
high amp draw g p
A06 Condenser Fan Motor (CFM)
hi h high amp draw d
A07 A07 Evaporator Fan Speed Evaporator Fan Speed
A08 Hot Water Solenoid (HWV)
hi h high amp draw d

TROUBLESHOOTING

Table 3-1 Alarm Indications

All components functioning normally
( ) Unit undercharged
Liquid line filter- -drier restricted
TXV strainer plugged with foreign material/ice.
TXV malfunction
Verify operation of evaporator fans.
Failed switch
( ) Unit overcharged
Verify operation of condenser fan
Noncondensibles in system
Discharge check valve failed closed (standby or road)
Failed switch
p Check liquid injection valve
Electric line voltage low
Current draw of road clutch coil either high or low
Current draw of contactor coil high or low
(0.2 amps -- 3 phase; 0.5 amps -- 1 phase)
Verify plunger moves freely
Replace contactor
( ) Verify motor rotates freely
Verify condition of brushes
Replace motor
Verify microprocessor configuration
Check fan motor output wires
( ) Current draw of coil high or low
Replace coil
SECTION 3
WARNING
CAUTION
CORRECTIVE ACTION
3-1
Reference
Paragraph
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4.10.1
4.5
4.6
4.16
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4.12.2
4.10.1
----
4.7.1
Replace
4.12.2
1.4
Replace
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4.13
----
2.9
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