Specifications

12
■ Compressor runs—goes off on
overload.
■ Loose connection. Inspect connection. Tighten if needed.
■ Shorted or broken wires. Test circuits with ohmmeter. Replace if needed.
■ Shorted or open capacitor. Test capacitor.
■ Shorted or grounded compressor. Test motor windings.
■ Compressor stuck. Use test cord.
■ Faulty compressor contactor. Test continuity of coil and contacts. Replace, if needed.
■ Low voltage. Test voltage.
■ Overcharge of refrigerant. Recover part of charge.
■ Dirty outdoor coil. Inspect coil and clean, if needed.
■ Improperly located thermostat. Relocate thermostat.
■ Wrong type of expansion valve. Replace valve.
■ Expansion valve restricted. Remove restriction or replace valve.
■ Undersized expansion valve. Replace valve.
■ Inoperative expansion valve. Check valve operation. Replace if needed.
■ Faulty reversing valve. Replace valve or solenoid.
■ Compressor cycles on overload. ■ Shorted or open capacitor. Test capacitor.
■ Compressor stuck. Use test cord.
■ Low voltage. Test voltage.
■ Improper cooling anticipator. Check resistance of anticipator.
■ Shortage of refrigerant. Test for leaks. Add refrigerant.
■ Restricted liquid line. Replace restricted part.
■ Overcharge of refrigerant. Recover part of charge.
■ Dirty outdoor coil. Inspect coil and clean, if needed.
■ Noncondensibles. Recover charge. Evacuate and recharge.
■ Recirculation of condensing air. Remove obstruction to airflow.
■ Wrong type of expansion valve. Replace valve.
■ Expansion valve restricted. Remove restriction or replace valve.
■ Undersized expansion valve. Replace valve.
Unsatisfactory Cooling/Heating
■ System runs continuously—little
cooling/heating.
■ Shortage of refrigerant. Test for leaks. Add refrigerant.
■ Restricted liquid line. Replace restricted part.
■ Open element or limit on electric heater (heating only). Test heater element and
controls.
■ Dirty air filter. Inspect filter; clean or replace as needed.
■ Dirty indoor coil. Inspect coil and clean, if needed.
■ Not enough air across indoor coil. Check blower speed. Check duct static pressure and
filter.
■ Infiltration of outdoor air. Check windows, doors, vent fans, etc.
■ System undersized. Refigure cooling load.
■ Broken valves. Test compressor efficiency.
■ Inefficient compressor. Test compressor efficiency.
■ Wrong type of expansion valve. Replace valve.
■ Expansion valve restricted. Remove restriction or replace valve.
■ Oversized expansion valve. Replace valve.
■ Undersized expansion valve. Replace valve.
■ Inoperative expansion valve. Check valve operation. Replace if needed.
■ Flowrator not seating properly. Check flowrator and seat, or replace flowrator.
Problem
No Cooling/Heating Cause/Test Method and/or Solution