Refrigeration System Diagnosis 14-5
REMOTE EVAPORATOR SYSTEM DIAGNOSIS
NOTE: This diagnosis guide applies to all TCI and SPECTRUM host unit models and TLE and SPECTRUM remote
evaporators.
CONDITION POSSIBLE CAUSE REMEDY
Load temperature too high Refrigerant shortage Repair leak and recharge
Controller defective Replace thermostat
Controller set too high Adjust thermostat setting
Expansion valve plugged Clean or replace
Partial obstruction in low side
of refrigeration system
Locate obstruction and repair
Iced or dirty evaporator coil Defrost or clean evaporator coil
Expansion valve open too much Replace or adjust valve
Poor fitting trailer doors Repair or replace doors
Liquid line solenoid partially
closed or defective
Repair or replace
Evaporator fan not operating Check and correct evaporator fan
Evaporator fan motor does not
operate
Multi-Temp µP-IV Controller:
Fuse F2, F12 or F15 blown
Check for short circuit and replace fuse
No output from 12 Vdc alternator Repair charging system
Open in 2A RFM wires. Locate open and repair
Defective fan motor Replace motor
Electric heaters (optional) do not
heat
Defective heater contactor Check heater contactor
Open circuit Check 7EH, L1, L2, L3, BRN, BLUE and RED circuits
Faulty heaters Check heaters
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