Troubleshooting - Procedure F; Troubleshooting - Procedure G; Troubleshooting - Procedure H - Norcold DC0040 Service Manual

Troubleshooting – Procedure F
Insufficient Cooling
Note: Check input voltage before
proceeding. Refer to Procedure A.
If compressor runs continuously:
Ø Check the voltage across the fan
leads. There will be a slight
voltage reading even if the fan isn't
operational. The fan will only
operate when the compressor is
running, and the ambient
temperature is sufficient to engage
the fan. The operational voltage of
the fan is between 17 and 22VDC.
If this is present at the leads and
the fan is not running, replace the
fan. (Note: When servicing fan,
Troubleshooting – Procedure G
Refrigerator too Cold
Ø Adjust temperature control to lower setting. (#1 = Warm, #5 = Coldest.)
Ø Make sure thermistor is securely mounted to the evaporator plate.
Ø If the reason is not found, refer to Procedure E.
Troubleshooting – Procedure H
Auto Shut-off Device
Note: Only the 12/24V DC models are
equipped with the auto shut-off device
within the power supply.
Shut-off Device Operation
To protect the cooling unit from
overheating, the refrigerator will
automatically shut-off when the ambient
air temperature is approximately 110°F. If
shut-off occurs, the refrigerator will sound
an intermittent alarm tone. To stop the
alarm, the refrigerator must be restarted.
This can be done by turning the
thermostat knob counterclockwise to the
OFF position and then turning it back to
the desired setting. The refrigerator will
not restart until the ambient conditions
allow for normal operation. The
8
do not short the wires; this will
damage the power supply.
Ø Make sure the ventilation vents are
not blocked. Refer to Procedure I.
Ø Make sure the auto shut-off device
is operational. Refer to Procedure
H.
Ø If the reason for insufficient cooling
is not found, start with Procedure
B.
Replace cooling unit if:
Ø Compressor is hot to the touch and
not vibrating.
Ø Compressor vibrates and no
cooling
functionality of the shut-off device can be
tested by heating it with a heat gun (See
Figure 9).
Figure 9 – High Temperature
Shut-off Device
TH2