Goodman CONDENSING UNIT Installation & Service Reference page 22

COMPLAINT
1. High Head Pressure
2. Low Head Pressure
3. Low Suction Pressure
4. High Suction Pressure
5. Compressor will not start.
TROUBLE SHOOTING ANALYSIS TABLE
PROBABLE CAUSE
1. Excessive charge of refrigerant in system.
2. Inadequate supply of air across the
condenser coil.
3. Non-condensate gases in the system.
1. System low on refrigerant.
2. Compressor valves broken.
1. Liquid line valve closed.
2. Restricted liquid line.
3. The bulb of the thermal expansion valve has
lost its charge.
4. System low on refrigerant.
5. Dirty filters.
6. Coil frosted up.
7. Flash gas in the liquid line.
8. Quantity of air through evaporator not
adequate.
1. Expansion valve stuck open.
2. Expansion valve bulb not in contact with
suction line.
3. Suction and/or discharge valve leaking or
broken.
1. Disconnect switch open.
2. Blow fuse or fuse at disconnect switch.
3. Thermostat set too high.
4. Selector switch in "Off" position.
5. Contactor and/or relay coils burned out.
6. Loose or open electrical connection in either
the control or power circuit.
1. Purge or pump-down excessive charge.
2. Make certain that coil is not fouled in any way, or that
air is not re-circulating.
3. Purge these gases from the system. Recharge
system, if necessary.
1. Charge system until sight glass is clear of bubbles.
2. Replace compressor.
1. Open the liquid line valve.
2. Replace filter-dryer.
3. Detach the bulb from the suction line and hold in one
hand. If no liquid refrigerant goes through the valve,
replace the valve.
4. Test the unit for leaks. Add refrigerant until sight glass
is free from bubbles, after repairing leak.
5. Clean or replace filter.
6. Defrost and clean coil. Clean or replace filters.
7. Excessive liquid line drop. Check liquid line size.
8. Increase the blower speed.
1. Correct valve action or replace the valve.
2. Fasten bulb securely to suction line.
3. Replace compressor.
1. Close the disconnect switch.
2. Check the cause of failure and replace the fuse.
3. Adjust to lower temperature.
4. Turn selector switch knob to "Cool" position.
5. Replace contactor and/or relay.
6. Inspect and secure all electrical connections.
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REMEDY