Troubleshooting Chart - Goodman GPC1336M41 Installation Instructions Manual

SYMPTOM
High head - low suction
High head - high or normal suction
Low head - high suction
Unit will not run
Condenser fan runs,
compressor doesn't
Low suction - cool compressor
Iced evaporator coil
Compressor short cycles
Registers sweat
High suction pressure
Insufficient cooling

TROUBLESHOOTING CHART

POSSIBLE CAUSE
a. Restriction in liquid line or flowrator
a. Dirty condenser coil
b. Overcharged
c. Condenser fan not running
a. Incorrect flowrator
b. Defective compressor valves
c. Flowrator not seating properly
d. Defective reversing valve
a. Power off or loose electrical connection
b. Thermostat out of calibration set too high b. Reset.
c. Defective contactor
d. Blown fuses or tripped breaker
e. Transformer defective
f. High or low pressure control open
(Optional)
g. Compressor overload contacts open
a. Loose connection
b. Compressor stuck, grounded or open
winding open internal overload
c. Low voltage connection
d. Capacitor weak, open, or shorted
a. Low indoor airflow
a. Defective overload protector
b. Unit cycling on low pressure control
a. Low airflow
a. Excessive load
b. Defective compressor
c. Reversing valve not seating properly.
a. Improperly sized unit
b. Improper airflow
c. Incorrect refrigerant charge.
d. Incorrect voltage
14
REMEDY
a. Remove or replace with proper size flowrator.
a. Clean coil.
b. Correct System charge.
c. Repair or Replace.
a. Replace with correct flowrator.
b. Replace compressor.
c. Check for debris under flowrator or deformed
flowrator. Remove debris or replace flowrator.
d. Replace reversing valve.
a. Check for unit voltage at contactor in unit.
c. Check for 24 volts at contactor coil replace if
contacts are open.
d. Replace fuse or reset breaker.
Check wiring - replace transformer.
e.
f. Reset high pressure control or check unit charge.
High pressure control opens at 610 psig.
Low pressure control opens at 22 psig.
g. Replace compressor.
NOTE: Wait at least 2 hours for overload to reset.
a. Check for unit voltage at compressor check &
tighten all connections.
b. Wait at least 2 hours for overload to reset If still
open, replace the compressor.
c. At compressor terminals, voltage must be within
10 % of nameplate volts when unit is operating.
d. Check capacitor. If defective, replace.
a. Increase speed of blower or reduce restriction -
replace air filters.
a. Replace - check for correct voltage.
b. Check refrigerant charge and / or airflow.
a. Increase speed of blower or reduce restriction
replace air filters.
a. Recheck load calculation.
b. Replace.
c. Replace.
a. Recalculate load.
b. Check - should be approximately 400 CFM per
ton.
c. Charge per procedure attached to unit service
panel.
d. At compressor terminals, voltage must be within
10% of nameplate volts when unit is operating.