Troubleshooting - Procedure A; Compressor Doesn't Run With Thermostat "On - Norcold DC0040 Service Manual

Troubleshooting - Procedure A

Compressor Doesn't Run with Thermostat "On"

Thermostat "ON" Compressor Does Not Run
Is Temperature
Control LED on?
NO
Check Supply
Voltage
(10.5 – 32V DC)
INCORRECT
(85 – 132V AC)
CORRECT
Power
Source
DC
AC
Measure Terminal
Voltage of Temperature
Control Between TP2 &
TP3. (See Figure 1)
Note: Measurements taken with 12.8V DC or 120V AC power supply.
Black
Red
Brown
Figure 1. Temperature Control
Refrigerator Service Manual
Measure Terminal
Voltage Of Temperature
YES Control Between TP1 &
TP2. (See Figure 1)
Correct
Voltage
Check Both Check DC
DC Fuses BLOWN Polarity
OK OK
Replace
10A Fuse
(See Figure 2)
DC
OPERATION
AC
DC 0V
OPERATION
DC 12
Normal
to 32V
DC
OPERATION
Check AC
Power Supply
AC
DC 0V
OPERATION (37 – 45V DC)
(See Figure 5)
BAD
DC 2V Normal
DC Power
DC 5V
Supply Failure
Compressor
OK
Runs
YES
NO
Reverse Polarity
& Check Operation
INCORRECT
(Red + / Black -)
Compressor
Runs
YES
NO
Check AC
Power Supply
(37 – 45V DC)
(See Figure 5)
See
BAD
Procedure B
Figure 2. Fuse Locations
NOTE: If 10 Amp fuse is blown, check the vehicle's wiring.
DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,
DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models
Change DC
Short Circuit
Power Supply
Change DC
Short Circuit
GOOD Power Supply
Change AC
Power Supply
See
Procedure B
Change DC
Power Supply
Replace
Compressor
10A Fuse
Runs
YES
(See Figure 2)
NO
OK
DC Power Change DC
Supply Failure Power Supply
DC Power Change DC
GOOD Supply Failure Power Supply
Change AC
Power Supply
OK
3