Dometic 750000005 (TJ18F) - Manual (Page 10)

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 10 of 20
4. Check each pin (motor winding) for continuity to ground. A multimeter can be used
in some cases but an insulation tester by “Meggar” should be used. If there is any
continuity to ground then the compressor is internally shorted and will need to be
replaced. This is not a field operation.
5. If a problem is not found in the compressor then the Danfoss module needs to be
replaced.
C. Checking the Fan
1. The Condenser Cooling Fan should come on after a five second delay once the
compressor starts.
2. Visually inspect fan for any blockages and make sure that it can turn freely.
3. If the fan can spin freely and is not working then first check the fan terminals “+”
(the lower of the two “+” symbols) and “F” on the module for voltage. The reading
should be approximately 12 volts.
4. If there is voltage at the module terminals then remove the fan wires from the
module and check for continuity through the fan itself by placing meter leads in each
fan wire push-on terminal. If there is no continuity through the fan then replace it.
Compressor terminals
(Current lead-in pins)
Condenser fan
terminals
(Current lead-in pins)