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Diagnosis: Troubleshooting, Status Messages, Alarm Codes
160
Head pressure too high
Refrigerant overcharge
Purge system
Air in refrigeration system
Evacuate and recharge
Dirty or restricted condenser coil
Clean condenser coil
Condenser fan not operating
See “Condenser Fan Motor Does Not
Operate” under “Mechanical
Diagnosis”
Condenser fan grille damaged or
missing
Repair or replace grille
Condenser fan blade damaged
Replace fan blade
High ambient air temperature
No remedy
Restricted dehydrator or high side
Replace filter drier or clear restriction
Defective service gauge
Replace gauge
Compressor loses oil
Refrigerant leak
Repair leak and recharge
Compressor oil migrates to
system
Short cycling
See "Unit Short Cycles" under
“Mechanical Diagnosis”
Rapid cycling between Cool,
Null and Heat modes
Air short cycling through evaporator
Check and correct cargo load
Defective controller or main relay
board
Diagnose main relay board and
controller. Replace defective
component
Short cycling
See “Unit Short Cycles” under
“Mechanical Diagnosis”
Compressor Digital Control valve
stuck close or defective
Replace valve
Hot liquid line
Shortage of refrigerant
Repair or recharge
Expansion valve open too wide
Adjust or replace expansion valve
Frosted liquid line
Liquid line restricted
Remove restriction
Restricted filter drier
Replace filter drier
Frosted or sweating suction
line
Expansion valve admitting excess
refrigerant
Check feeler bulb and adjust
expansion valve
Evaporator coil needs defrosting
Check defrost circuit including
controller and evaporator coil sensor
Evaporator fan does not operate
See “Evaporator Fan Motor Does Not
Operate” under “Mechanical
Diagnosis”
Unit in vacuum—frost on
expansion valve only
Ice plugging expansion valve screen
or orifice
Apply hot wet cloth to expansion
valve. Moisture indicated by increase
in suction pressure. Replace filter
drier
High suction pressure
Overcharge of refrigerant
Purge system
Expansion valve open too much
Adjust or replace valve
Defective controller or main relay
board
Diagnose main relay board and
controller. Replace defective
component
Service gauge out of calibration
Adjust or replace service gauge
Condition
Possible Cause
Remedy
Summary of Contents for 098916
Page 5: ......
Page 11: ...Table of Contents 10...
Page 19: ...Service Guide 18...
Page 28: ...Specifications 27 Figure 2 Physical Specifications AMA313...
Page 41: ...Unit Description Features Options 40...
Page 105: ...Operating Instructions 104...
Page 155: ...Servicing The Unit 154...
Page 187: ...Index 186...
Page 189: ...Wiring and Schematic Diagrams Index 188...
Page 190: ...189 Wiring Schematic...
Page 191: ...190 Wiring Diagram Page 1 of 2...
Page 192: ...191 Wiring Diagram Page 2 of 2...