Troubleshooting Chart - Goodman GPH1624M41 Installation Instructions Manual

SYMPTOM
High head - low s uction
High head - high or norm al s uction
Low head - high s uction
Unit will not run
Condens er fan runs ,
com pres s or does n't
Low s uction - cool com pres s or
Iced evaporator coil
Com pres s or s hort cycles
Regis ters s weat
High s uction pres s ure
Ins ufficient cooling

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. Res triction in liquid line or
TXV not functioning
a. In Cooling: Dirty condens er coil
In Heating: Dirty filter, Dirty indoor coil
b. Overcharged
c. In Cooling: Condens er fan not running
c. In Heating: Indoor blower not running
a. Incorrect TXV.
b. Defective com pres s or valves
c. TXV not functioning properly
d. Incorrect TXV s etting
a. Power off or loos e electrical
connection
b. Therm os tat out of calibration s et too
c. Defective contactor
d. Blown fus es or tripped breaker
e. Trans form er defective
f. High or low pres s ure control open
(Optional)
g. Com pres s or overload contacts open
a. Loos e connection
b. Com pres s or s tuck, grounded or open
winding open internal overload
c. Low voltage connection
d. Capacitor weak, open, or s horted
a. In Cooling: Low indoor airflow
In Heating: Dirty outdoor coil, defective
defros t therm os tat, defective defros t
control board, outdoor fan not running,
low refrigerant charge.
b. Low airflow
c. Low refrigerant charge
d. Operating unit in cooling m ode below
65°F outdoor tem perature
a. Defective overload protector
b. Unit cycling on low pres s ure control
c. High pres s ure s witch cuts out
a. Low airflow
a. Exces s ive load
b. Defective com pres s or
c. Revers ing valve not s eating properly.
a. Im properly s ized unit
b. Im proper airflow
c. Incorrect refrigerant charge.
d. Incorrect voltage
a. Rem ove or replace with proper s ize TXV.
a. Clean coil
b. Correct Sys tem charge
c. Repair or Replace
a. Replace with correct TXV
b. Replace com pres s or
c. Check for debris in TXV or deform ed TXV.
Rem ove debris or replace TXV.
d. Check Super Heat
a. Check for unit voltage at contactor in unit
b. Res et
c. Check for 24 volts at contactor coil replace if
contacts are open
d. Replace fus e or res et breaker
e.
Check wiring - replace trans form er
f. Check high pres s ure control or check unit
charge
High pres s ure control opens at 610 ps ig
Low pres s ure control opens at 22 ps ig
g. Replace com pres s or
NOTE: Wait at leas t 2 hours for overload to
a. Check for unit voltage at com pres s or check &
tighten all connections
b. Wait at leas t 2 hours for overload to res et If
s till open, replace the com pres s or.
c. At com pres s or term inals , voltage m us t be
10 % of nam eplate volts when unit is
d. Check capacitor. If defective, replace.
a. Increas e s peed of blower or reduce res triction
- replace air filters
b. Check - s hould be approxim ately 400 CFM per
ton, dirty air filters , all duct outlets open
c. Properly charge unit
d. Ins tall or check low am bient control, s hould
be open below 65°F outdoor tem perature
a. Replace - check for correct voltage
b. Check refrigerant charge and / or airflow
c. Check airflow (indoor & outdoor),
check expans ion device
a. Increas e s peed of blower or reduce res triction
replace air filters
a. Recheck load calculation
b. Replace
c. Replace
a. Recalculate load
b. Check - s hould be approxim ately 400 CFM per
ton
c. Charge per procedure attached to unit s ervice
panel
d. At com pres s or term inals , voltage m us t be
within 10% of nam eplate volts when unit is
operating
16
REMEDY