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