Troubleshooting - Test F, Insufficient Cooling; Troubleshooting - Test G, Refrigerator Is Too Cold; Troubleshooting - Test H, Correct Ventilation; Fig. 6 - Approved Vent Combinations - Norcold DC0788 Manuel D'entretien

Troubleshooting, cont'd.
4. Measure the temperature and resistance of the thermistor. See
table below.
• 1.6K - 29 K Ohms - Good thermistor
• ∞ Ohms - Open thermistor windings (will stop compressor
operation) - Replace thermistor.
Thermistor Thermistor
Temperature °F Resistance
0 10.9 K
10 8.5 K
20 6.7 K
30 5.3 K
40 4.3 K
50 3.5 K
60 2.8 K
70 2.3 K
80 1.9 K
90 1.6 K
Troubleshooting - Test F, Insuffi cient cooling
1. Perform the "Diagnostic Pre-checks".
2. Verify that the thermostat is set at #3 or higher.
3. Verify that the fan is running. If not, replace fan.
4. Verify that there is correct ventilation through the condenser
coil. Is the condenser coil clean and unobstructed?
• No : Clean condenser coil or correct ventilation.
• Yes: Replace cooling unit.

Troubleshooting - Test G, Refrigerator is too cold

1. Perform the "Diagnostic Pre-checks".
2. Change Temperature Control to a lower setting (#1 = warmest,
#5 = coldest).
3. Is the evaporator thermistor securely mounted to plate?
• No: Reposition thermistor or securely tighten mounting
screw.
• Yes: See Troubleshooting Test "E".
www.norcold.com
Allowable Resistance
Range
10.7 K - 11.2K
8.3 K - 8.7 K
6.6 K - 6.9 K
5.2 K - 5.5 K
4.2 K - 4.4 K
3.4 K - 3.5 K
2.76 K - 2.84 K
2.27 K - 2.32 K
1.86 K - 1.91 K
1.54 K - 1.58 K
9

Troubleshooting - Test H, Correct ventilation

Ventilation is necessary for the correct operation of the refrigerator
and to increase the life of the refrigerator cooling system.
Ventilation allows the natural air fl ow that is necessary for good
refrigeration. Cooler air comes in from the living area through
a lower intake vent, goes through the refrigerator coils where it
removes the excess heat from the refrigerator components, and
goes out into the living area through an upper exhaust vent. If
this airfl ow is blocked or decreased, the refrigerator will not cool
correctly. Do not install the vents into areas such as closets or
cabinets. Each refrigerator has specifi ed minimum vent size
requirements (25 - 50 square inches). However, more air fl ow
over the refrigerator coils increases the cooling performance of the
refrigerator. If the construction of the vehicle does not allow you to
install the vents into the living area of the vehicle, use any of the
following approved vent combinations that are at the rear of the
refrigerator enclosure (Refer to Fig. 6).
Approved vent combinations
A / B B / C C / D D / E
A / D B / E C / I D / F
A / I B / F C / J D / G
CAUTION: Each refrigerator has specifi ed minimum vent size
!
requirements (25 - 50 square inches). Vent sizes that are less than the
minimum requirements can cause:
• shortened life of the refrigerator cooling unit.
• poor cooling performance of the refrigerator.
• continuous operation of the refrigerator.
• fast battery discharge.
• void of the refrigerator warranty.
E
A
B

Fig. 6 - Approved Vent Combinations

E / I F / I G / I
E / J F / J G / J
A / J B / G D / H
F
C
H
G
D
J
I
Art01129
SERVICE MANUAL
H / I
H / J
B / H