Carrier 40 - Troubleshooting Section; Troubleshooting Introduction

3-1
62-10630
SECTION 3
TROUBLESHOOTING
WARNING
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)intheOFF position.Toensureunit iswithoutpower,removepowerplugand
remove battery negative cable.
CAUTION
Under no circumstances should anyone attempt to service the microprocessor (see section 4.17).
Shouldaproblemdevelopwiththemicroprocessor,contactyournearestCarrierTransicolddealerfor
replacement.
3.1 INTRODUCTION
Undernormalcircumstances, unit problemswillbeindicatedbyanactive or inactivealarminthealarm 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.
Table 3 -1 Alarm Indications
ALARM
Description CORRECTIVE ACTION
Reference
Paragraph
A00 No Malfunction All components functioning normally -- --
A01 Low Pressure Switch (LPS)
O
(
R
d
)
Unit undercharged 4.10.1
(
)
Open (Road)
Liquid line filter--drier restricted
4.5
TXV strainer plugged with foreign material/ice.
4.6
TXV malfunction
4.16
Verify operation of evaporator fans.
-- --
Failed switch
4.12.2
A02 High Pressure Switch (HP1)
O
Unit overcharged 4.10.1
g
(
)
Open
Verify operation of condenser fan
-- --
Noncondensibles in system
4.7.1
Discharge check valve failed closed (standby or road)
Replace
Failed switch
4.12.2
A03 Standby Compressor Thermal
O
l
d
(
P
T
C
)
Check liquid injection valve
y
p
Overload (PTC) open
Electric line voltage low
1.4
A04 Road Compressor Clutch
(CLHR) Malfunction
Current draw of road clutch coil either high or low Replace
A05 Standby Contactor (MC)
high amp draw
Current draw of contactor coil high or low
(0.2 amps -- 3 phase; 0.5 amps -- 1 phase)
-- --
g
p
Verify plunger moves freely
-- --
Replace contactor
-- --
A06 Condenser Fan Motor (CFM)
h
i
h
d
Verify motor rotates freely -- --
(
)
high amp draw
Verify condition of brushes
4.13
Replace motor
-- --
A
0
7
E
v
a
p
o
r
a
t
o
r
F
a
n
S
p
e
e
d
Verify microprocessor configuration 2.9
A
0
7
E
vapora
t
or
F
an
S
pee
d
Check fan m otor output wires
-- --
A08 Hot Water Solenoid (HWV)
h
i
h
d
Current draw of coil high or low -- --
(
)
high amp draw
Replace coil
-- --