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Troubleshooting Information
Complaint No Cooling
Unsatisfactory
Cooling
System
Operating
Pressures
(13
e
POSSIBLE CAUSE = u-
c
oo.s,.A.ALYS,SO
GUIDE INDICATE
"POSSIBLE CAUSE" -- _ =
o_ o_
B
o
Power Failure •
Blown Fuse • •
Loose Connection •
Shorted or Broken Wires • • •
Open Overload
Faulty Thermostat • •
Faulty Transformer • •
Shorted or Open Capacitor •
Internal Compressor Overload Open •
Shorted or Grounded Compressor •
Compressor Stuck •
Faulty Compressor Contactor • • •
Faulty Fan Relay
Open Control Circuit
Low Voltage •
Faulty Evaporator Fan Motor
Shorted or Grounded Fan Motor
Improper Cooling Anticipator
Shortage or Refrigerant
Restricted Liquid Line
Undersized Liquid Line
Undersized Suction Line
Not Enough Air across indoor Coi!
Too Much Air across Indoor Coil
Overcharge of Refrigerant
Noncondensibles
Recirculation of Condensing Air
Infltration of Outdoor Air
Improperly Located Thermostat
_,ir Flow Unbalanced
System Undersized
Broken Internal Parts
Broken Valves
Inefficient Compressor
High Pressure Control Open •
Unbalanced Power, 3PH •
Wrong Type Expansion Valve
Expansion Valve Restricted
Oversized Expansion Valve
Undersized Expansion Valve
Expansion Valve Bulb Loose
Inoperative Expansion Valve
Loose Hold-down Bolts
o
8
o
o _
_'_ _ _
__R_
__B
mo©o_
o
E _
E
o _
o
_'_ _ _ __
8 8 _ _
o
I-- Z 0 0
o .....
Test Method
Remedy
Test Voltage
impact Fuse Size & Type
inspect Connection - Tighten
Test Circuits with Ohmmeter
Test Continuity of Overloads
Test Continuity of Thermostat and Wiring
Check Control Circuit with Voltmeter
Test Capacitor
Test Continuity of Overload
Test Motor Windings
Use Test Cord
Test Continuity of Coi! and Contacts
Test Continuity of Coi! and Contacts
Test Control Circuit with Voltmeter
Test Voltage
Repair or Replace
Test Motor Windings
Check Resistance of Anticipator
Test For Leaks, Add Refrigerant
Replace Restricted Part
Replace Line
Replace Line
Speed Blower, Check Duct Static Pressure
Reduce Blower Speed
Recover Part of Charge
Recover Charge, Evacuate, Recharge
Remove Obstruction to Air Flow
Check Windows, Doors, Vent Fans, Etc.
Relocate Thermostat
Readjust Air Volume Dampers
Refigure Cooling Load
Replace Compressor
Test Compressor Efficiency
Test Compressor Efficiency
Reset and Test Control
Test Voltage
Replace Valve
Replace Valve
Replace Valve
Replace Valve
Tighten Bulb Bracket
Check Valve Operation
Tighten Bolts
For detailed service information refer to the Remote Condensing Unit Service manual.