
62-11785
9–2
Refrigeration system
Abnormal pressure
Expansion valve malfunction
No or restricted evaporator airflow
Suction Modulation Valve malfunction
Check system for non-condensibles
Check economizer
Check refrigerant charge
Check condenser coil
9.2.3
Unit Operates Long Or Continuously In Cooling
Refrigerated Compartment
Hot Load
Allow time to pull down
Defective or insufficient refrigerated compartment in-
sulation or air leak
Correct
Refrigeration system
Abnormal pressure
Temperature sensor malfunction
Check system for non-condensibles
Compressor
Defective
9.2.4
Unit Will Not Terminate Cooling
Unit fails to stop cooling
Temperature sensor malfunction
Incorrect temperature scale, check whether micropro-
cessor is set for °C or °F
Check
Incorrect DC Charging Current limit
Low Battery Voltage
Supply air temperature limit is too low
9.2.5
Unit Will Not Heat Or Has Insufficient Heating
Unit will not heat or has insuffi-
cient heat
Heater(s) defective
Heater contactors or coil defective
Replace
Defective wiring / connectors
Replace
Loose terminal connections
Tighten
No or restricted air flow
Temperature sensor malfunction
9.2.6
Unit Will Not Terminate Heating
Unit fails to stop heating
Microprocessor temperature improperly set
Reset
Microprocessor malfunction
Temperature sensor malfunction
9.2.7
Defrost Cycle Malfunction
Will not initiate defrost automat-
ically
Defrost timer has not expired
Check/Reset
Defrost air switch (DAS) malfunction
DTT is above 40°F (4.4°C)
Cool Down
Loose terminal connections (DAS)
Tighten
Will not initiate defrost manually
Keypad defective
Loose terminal connections between keypad and mi-
croprocessor
Tighten
DTT is above 40°F (4.4°C)
Cool Down
Unit has been running less than 15 seconds
Try again
Indication/Trouble
Possible Causes
Action/Reference
Section
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