Literature Order Number SS-SVF15A-EN
Date August 2009
Supersedes New
The manufacturer has a policy of continuous product and product data improvement and reserves
the right to change design and specifications without notice. Only qualified technicians should
perform the installation and servicing of equipment referred to in this literature.
Troubleshooting
SYSTEM FAULTS
POWER SUPPLY
HIGH VOLTAGE WIRING
COMPR. IOL
RUN CAPACITOR
CONTACTOR CONTACTS
LOW VOLTAGE WIRING
CONTROL TRANSFORMER
CONTACTOR COIL
INEFFICIENT COMPRESSOR
REFRIGERANT UNDERCHARGE
REFRIGERANT OVERCHARGE
EXCESSIVE EVAP. LOAD
NONCONDENSABLES
RESTRICTED O.D. AIRFLOW
O.D. AIR RECIRCULATION
TXV STUCK OPEN
SUPERHEAT
RESTRICTED I.D. AIRFLOW
REF. CIRCUIT RESTRICTIONS
REFRIGERANT CIRCUIT
Head Pressure Too High PSPS S
Head Pressure Too Low SP SS S
Suction Pressure Too High SPP SP
Suction Pressure Too Low SSPS
Liquid Refrig. Floodback (TXV System) PS S
I.D. Coil Frosting PS
Compressor Runs Inadequate or No Cooling S P P S S P S
ELECTRICAL
Compressor & O.D. Fan Do Not Start P P S P P
Compr. Will Not Start But O.D. Fan Runs P S S
O.D. Fan Won't Start P P S
Compressor Hums But Won't Start P S
Compressor Cycles on IOL P S S S P P S S S P S
I.D. Blower Won't Start P S S P
P Primary Causes S Secondary Causes
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