Whirlpool WHP44 - Page 14

14
System Operating Pressures
■ Low suction pressure. ■ Faulty evaporator fan motor. Repair or replace.
■ Shortage of refrigerant. Test for leaks. Add refrigerant.
■ Restricted liquid line. Replace restricted part.
■ 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.
■ Dirty outdoor coil (heating only). Inspect coil and clean, if needed.
■ 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 defrost control (heating only). Test control.
■ Faulty defrost thermostat (heating only). Test defrost thermostat.
■ Low head pressure. ■ Shortage of refrigerant. Test for leaks. Add refrigerant.
■ Restricted liquid line. Replace restricted part.
■ Too much air across indoor coil (heating only). Reduce blower speed.
■ Broken valves. Test compressor efficiency. Replace if needed.
■ Inefficient compressor. Test compressor efficiency.
■ Wrong type of expansion valve. Replace valve.
■ Expansion valve restricted. Remove restriction or replace valve.
■ Faulty reversing valve (heating only). Replace valve or solenoid.
■ Faulty defrost control (heating only). Test control.
■ Faulty defrost thermostat (heating only). Test defrost thermostat.
■ Flowrator not seating properly. Check flowrator and seat, or replace flowrator.
■ High suction pressure. ■ Too much air across indoor coil. Reduce blower speed.
■ Overcharge of refrigerant. Recover part of charge.
■ Broken valves. Test compressor efficiency. Replace if needed.
■ Inefficient compressor. Test compressor efficiency.
■ Expansion valve bulb loose. Tighten bulb bracket.
■ Faulty reversing valve (heating only). Replace valve or solenoid.
■ Faulty defrost thermostat (heating only). Test defrost thermostat.
■ Flowrator not seating properly. Check flowrator and seat, or replace flowrator.
Problem
No Cooling/Heating Cause/Test Method and/or Solution