Troubleshooting Chart - Goodman GPH1524M41 Installation 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
Evaporator coil freezing or frosting

TROUBLESHOOTING CHART

HIGH VOLTAGE!
Disconnect ALL power before servicing or installing this unit. Multiple
power sources may be present. Failure to do so may cause property
damage, personal injury or death.
POSSIBLE CAUSE
a. Restriction in liquid line or
TXV not functioning
a. Dirty condenser coil
b. Overcharged
c. Condenser fan not running
a. Incorrect TXV.
b. Defective compressor valves
c. TXV not functioning properly
d. Incorrect TXV setting
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
c. High pressure switch cuts out
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
a. Low airflow
b. Low refrigerant charge
c. Operating unit in cooling mode below
65°F outdoor temperature
a. Remove or replace with proper size TXV.
a. Clean coil
b. Correct System charge
c. Repair or Replace
a. Replace with correct TXV
b. Replace compressor
c. Check for debris in TXV or deformed TXV.
Remove debris or replace TXV.
d. Check Super Heat
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
f. Check 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
c. Check airflow (indoor & outdoor),
check expansion device
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
a. Check - should be approximately 400 CFM per
ton, dirty air filters, all duct outlets open
b. Properly charge unit
c. Install or check low ambient control, should be
open below 65°F outdoor temperature
13
REMEDY