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Whirlpool WHP43 Installation Instructions Manual page 14

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Problem
No Cooling/Heating
System Operating Pressures
Low suction pressure.
Low head pressure.
High suction pressure.
14
Cause/Test Method and/or Solution
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.
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.
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.

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