Manual 2100-479
Page 10 of 11
Manual 2100-479
Page 10 of 11
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Power Failure
Blown Fuses or Tripped Circuit Breakers
Faulty Wiring
Loose Terminals
Low Voltage
Single 1PH Failure of 3PH
Unbalanced Power Supply 3PH
Voltage Too High
Open Disconnect Switch
Faulty Wiring
Loose Terminal
Low Voltage
Defective Contacts in Contactor
Compressor Overload
Potential Relay Fails to Open
Potential Relay Fails to Close
Run Capacitor
Start Capacitor
Faulty Wiring
Loose Terminals
Control Transformer
Low Voltage
Thermostat
Contactor Coil
Pressure Control
Condenser Fan Relay
Evaporator Fan Relay
Compressor Motor
Condenser Motor
Evaporator Motor
Compressor Off on Internal Overload
Hold Down Bolts
Defective Compressor Bearings
Seized Compressor
Defective Compressor Valves
Compressor Oil Level
Open or Short Motor Windings
Refrigerant Charge Low
Overcharge of Refrigerant
High Head Pressure
High Suction Pressure
Low Suction Pressure
Temperatures
Non-Condensables (Air, etc.)
Excessive Load in Space
Liquid Valve Partially Closed
Condenser Fins Dirty or Plugged
Condenser Fan Belt Slipping
Condenser Air Short Circuiting
Low Condenser Air Volume
Condenser Air Temperature Low
Plugged or Restricted Metering Device
Evaporator Fins Dirty or Plugged
Evaporator Belt Slipping
Low Evaporator Air Volume
Dirty Filters
Ductwork Small or Restricted
Restrictions
Thermostat Setting
Thermostat Location
Stratified Air in Space
Incorrect Refrigerant Piping
System Too Small
y
Generally the cause.
Always make these
checks first.
Occasionally the cause.
Make these checks only
if first checks fail to
locate trouble.
Rarely the cause. Make
this check only if
previous checks fail to
locate trouble.
TROUBLESHOOTING CHART FOR AIR CONDITIONERS
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