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Whirlpool WHP43 Installation Instructions Manual page 13

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Problem
No Cooling/Heating
Too cool/warm and then too warm/
cool.
Not cool enough on warm days.
Certain areas too cool, others too
warm.
Compressor is noisy.
Heating Only—System runs—blows
cold air in heating.
Heating Only—Unit will not
terminate defrost.
Heating Only—Unit will not defrost.
Cause/Test Method and/or Solution
Faulty thermostat. Test continuity of thermostat and wiring. Replace, if needed.
Improper cooling anticipator. Check resistance of anticipator.
Improperly located thermostat. Relocate thermostat.
Airflow unbalanced. Readjust air volume dampers.
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.
Noncondensibles. Recover charge. Evacuate and recharge.
Recirculation of condensing air. Remove obstruction to airflow.
Infiltration of outdoor air. Check windows, doors, vent fans, etc.
System undersized. Refigure cooling load.
Wrong type of expansion valve. Replace valve.
Expansion valve restricted. Remove restriction or replace valve.
Undersized expansion valve. Replace valve.
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.
Airflow unbalanced. Readjust air volume dampers.
Overcharge of refrigerant. Recover part of charge.
Broken internal parts. Replace compressor.
Broken valves. Test compressor efficiency. Replace if needed.
Expansion valve bulb loose. Tighten bulb bracket.
Loose hold-down bolts. Tighten bolts.
Internal compressor overload open. Test continuity of overload.
Compressor stuck. Use test cord.
Shortage of refrigerant. Test for leaks. Add refrigerant.
Open element or limit on electric heater (heating only). Test heater element and
controls.
Overcharge of refrigerant. Recover part of charge.
Noncondensibles. Recover charge. Evacuate and recharge.
Broken internal parts. Replace compressor.
Inefficient compressor. Test compressor efficiency.
Faulty reversing valve. Replace valve or solenoid.
Faulty defrost control. Test control.
Faulty defrost thermostat. Test defrost thermostat.
Faulty reversing valve. Replace valve or solenoid.
Faulty defrost control. Test control.
Faulty defrost thermostat. Test defrost thermostat.
Faulty reversing valve. Replace valve or solenoid.
Faulty defrost control. Test control.
Faulty defrost thermostat. Test defrost thermostat.
13

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