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System Troubleshooting - Whirlpool WGPH45 AM Installation Instructions Manual

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Symptom
High head—low suction
High head—high or normal
suction
Low head—high suction
Unit will not run.
Condenser fan runs;
compressor does not run.
Low suction—Cool
compressor, iced evaporator
coil
Compressor short cycles
Registers sweat
High suction pressure
Insufficient cooling
Evaporator coil freezing or
frosting
10

System Troubleshooting

Possible Cause
Restriction in liquid line or flowrator
Dirty condenser coil
Overcharged
Condenser fan not running
Incorrect flowrator
Defective compressor valves
Flowrator not seating properly
Power off or loose electrical connection
Thermostat out of calibration; set too
high
Defective contactor
Blown fuses or tripped circuit breaker
Transformer defective
High or low pressure control (optional)
open
Compressor overload contacts open
Loose connection
Compressor stuck
Grounded or open winding
Open internal overload
Low voltage connection
Capacitor weak, open or shorted
Low indoor airflow
Defective overload protector
Unit cycling on low pressure control
High pressure switch cuts out
Low airflow
Excessive load
Defective compressor
Reversing valve not seating properly.
Improperly sized unit
Improper airflow
Incorrect refrigerant charge.
Incorrect voltage
Low airflow
Low refrigerant charge
Operating unit in cooling mode below
65ºF (18ºC) outdoor temperature
Remedy
Remove or replace with proper size flowrator.
Clean coil.
Correct system charge.
Repair or replace condenser fan.
Replace with correct flowrator.
Replace compressor.
Check for debris under flowrator or deformed flowrator.
Remove debris or replace flowrator.
Check for unit voltage at contactor in unit.
Reset thermostat.
Check for 24 volts at contactor coil. Replace if contacts
are open.
Replace fuse or reset circuit breaker. Check wiring.
Replace transformer.
Reset high pressure control or check unit charge.
High pressure control opens at 610 psig, and low
pressure control opens at 22 psig.
Replace compressor.
NOTE: Wait at least 2 hours for overload to reset.
Check for unit voltage at compressor.
Check and tighten all connections.
Wait at least 2 hours for overload to reset. If still open,
replace the compressor.
At compressor terminals, voltage must be within 10%
of nameplate volts when unit is operating.
Check capacitor. Replace if defective.
Increase speed of blower or reduce restriction.
Replace air filters.
Replace overload protector. Check for correct voltage.
Check refrigerant charge and/or airflow.
Check airflow (indoor and outdoor)
Increase speed of blower or reduce restriction.
Replace air filters.
Recheck load calculation
Replace compressor.
Replace reversing valve.
Recalculate load.
Check airflow—should be approximately 400 CFM per
ton.
Charge per procedure attached to unit service panel.
At compressor terminals, voltage must be within 10%
of nameplate volts when unit is operating.
Check airflow—should be approximately 400 CFM per
ton.
Properly charge unit.
Install or check low ambient control—should be open
below 65ºF (18ºC) outdoor temperature.

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