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Freightliner Refrigerator Troubleshooting Guide
750000005 (TJ18F)
750000011 (TJ22F)
750000026 (TJ18FP3)
DOMETIC CORPORATION, ENVIRONMENTAL DIVISION
P.O. Box 15299 I Richmond, VA 23227 USA
Phone +804 746 1313 | Fax +804 746 7248
www.dometic.com Page 5 of 20
The LOAD DUMP module is defective if the unit operates while wired to the
DANFOSS module. Replace Load Dump module.
9. If LOAD DUMP module is working properly, check the speed resistor. This
component is used to control the speed of the compressor and is located on the “T”
terminal of the DANFOSS module.
Turn off power and disconnect the speed resistor from the Danfoss module.
Remove the speed resistor from the blue wire and connect the blue wire on the
Danfoss module terminal “T” where the speed resistor was removed.
Connect power (12volts) back to the unit. If the unit performs, the speed resistor is
faulty. Replace Speed Resistor.
10. Test the Thermostat Circuit. Remove the blue wire that is connected on terminal
“C” and remove the (black) Speed resistor (attached to the other blue wire)
connected to terminal “T” of the Danfoss module. These two wires represent the
thermostat circuit.
Make sure the thermostat knob is turned on, remove the speed resistor, set
multimeter to check continuity and connect meter leads to these wires as shown.
Speed Resistor
Blue Wire from
thermostat
Speed Resistor connected to
other blue wire from
thermostat