42
18-EB40D1-1A-EN
Troubleshooting Chart
PP--PPRRIIMMAARRYY CCAAUUSSEESS // SS--SSEECCOONNDDAARRYY CCAAUUSSEESS
SYSTEM FAULTS
Power Supply
High Voltage Wiring
Compr. I0L
Run Capacitor
Start capacitor
Start Relay
Contactor Contacts
Low Voltage Wiring
Control Transformer
Contactor Coil
Low Voltage Fuse
Stuck Compressor
Ineffecient Compressor
Refrigerant Undercharge
Refrigerant Overcharge
Excessive Evap. Load
Noncondensables
Restricted O.D. Airflow
O.D. Air Recirculation
TXV Stuck Open
Low Superheat
High Superheat
Restricted I.D. Airflow
Ref. Circuit Restrictions
REFRIGERANT CIRCUIT
Liquid Pressure too High
P S P S S
Liquid Pressure too Low
S P S S S
Suction Pressure too High
S P P S S
Suction Pressure too Low S S P S
Liquid Refrigerant
Floodback (TXV System)
S S P
I.D. Coil Frosting
P S P S
Compressor Runs
Inadequate or No Cooling
S P P S S S S P S
ELECTRICAL
Compressor & O.D. Fan Do
Not Start
P P S S P P P
Compressor will not Start
but O.D. Fan Runs
P S P P P S
O.D. Fan will Not Start P P
Compressor Hums but will
Not Start
P P P P S S
Compressor Cycles on IOL
P S P P P S P S P S S S S S S S
I.D. Blower willnot Start P S S P P
UUnniitt SSttaarrttuupp
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