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Remote Evaporator System Diagnosis
Condition Possible Cause Remedy
Load temperature too high Refrigerant shortage Repair leak and recharge
Setpoint too high Adjust setpoint
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 door 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
run
Fuse blown
Check for short circuit in unit wiring
and replace fuse
Open in FM circuit Locate open and repair
Defective fan relay Replace fan relay
Defective fan motor Replace fan motor
Bad ground Tighten connection at ground stud
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