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Carrier 38KLE28-H - User Manual

Carrier 38KLE28-H
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2005
SERVICE & MAINTENANCE MANUAL

Table of Contents

Questions and Answers

  • L
    Linda PowellAug 18, 2025
    What to do if the Carrier Air Conditioner compressor and outdoor fan won't start?
    • A
      Amy Avila DDSAug 18, 2025
      If the compressor and outdoor fan of your Carrier Air Conditioner fail to start, there could be several reasons. First, there may be a power failure, in which case you should call the power company. Also, a fuse might be blown or a circuit breaker tripped, so replace the fuse or reset the circuit breaker. Other potential issues include a defective contactor (replace it), low line voltage (determine and eliminate the cause), incorrect or loose wiring (check the wiring diagram and rewire correctly), or a temperature setting that is too low (reset the temperature setting).
  • M
    Michael DeleonAug 20, 2025
    How to fix a Carrier 38KLE28-H Air Conditioner when the compressor won't start but the outdoor fan runs?
    • S
      Shane DunlapAug 20, 2025
      If the compressor on your Carrier Air Conditioner won't start but the outdoor fan is running, the issue could be due to faulty wiring or loose connections in the compressor circuit, so check the wiring and repair or correct as needed. Another possibility is that the compressor motor is burned out, stuck, or has an internal overload open, which would require replacing the compressor and determining the cause. Lastly, a defective run capacitor could be the problem, so consider replacing it.
  • L
    lisa64Aug 23, 2025
    What to do if Carrier 38KLE28-H Air Conditioner unit doesn't beep when pressing the start button?
    • J
      Jason SmithAug 23, 2025
      If your Carrier Air Conditioner unit doesn't acknowledge the signal with a beep when pressing the start button, make sure the main switch is in the ON position. Also, the remote control batteries may be exhausted, so replace them. Ensure the remote control is pointed correctly at the indoor unit's receiver. Obstacles like curtains or walls could be blocking the signal, so remove them. Direct sunlight on the receiver or remote control can interfere, so avoid direct sun. Severe interference from an electromagnetic field might also obstruct the signal, so avoid sending signals near operating computers or household appliances.
  • T
    Tina RollinsAug 26, 2025
    Why is the display not lit on my Carrier 38KLE28-H remote after placing batteries?
    • B
      Brett KimAug 26, 2025
      If the display on your Carrier Air Conditioner remote control is not lit after inserting batteries, the batteries may be exhausted or have the wrong polarity. Replace the batteries or check their polarity to resolve this issue.
  • C
    Cynthia YoungAug 27, 2025
    Why does my Carrier 38KLE28-H Air Conditioner compressor run continuously?
    • S
      Sandra WalkerAug 27, 2025
      Your Carrier Air Conditioner's compressor might run continuously due to several reasons. The system may be undersized for the load, requiring you to decrease the load or increase the system size. Alternatively, the temperature setting might be too low, so try resetting it. A defective outdoor fan could also be the cause, so check for the source and replace if necessary. Other causes include air or non-condensable refrigerant in the system, which requires you to blow refrigerant, evacuate the system, and recharge it. Finally, check for restricted airflow or a dirty indoor section filter and clean the filter or remove any restrictions.
  • W
    Whitney MeyerSep 1, 2025
    Why is the head pressure excessive in my Carrier 38KLE28-H?
    • T
      tiffanyfosterSep 1, 2025
      Excessive head pressure in your Carrier Air Conditioner can stem from several issues. A dirty outdoor coil can cause this, so clean the coil. Also, a defective outdoor fan may be the problem, so replace it if necessary. Other potential causes include the refrigerant being overcharged (purge excess refrigerant), air or non-condensable refrigerant in the system (blow refrigerant, evacuate system and recharge), or a restriction in the outdoor section airflow (remove the restriction).
  • E
    elizabethespinozaSep 3, 2025
    What causes low suction pressure in a Carrier 38KLE28-H Air Conditioner?
    • M
      michellebaldwinSep 3, 2025
      Low suction pressure in your Carrier Air Conditioner can be attributed to several factors. It could be due to a low refrigerant charge, in which case you should check for leaks, repair them, and recharge the system. The indoor unit might be frosted. Low indoor air or short cycling may also cause this, so eliminate the cause and check if the fan is working. A restriction in the suction tube, such as a capillary or accurate restriction or ice clog, could be the reason, so locate and remove the restriction. Also, the refrigerant may need to be blown, the system evacuated, and then recharged.
  • J
    Jason GilbertSep 5, 2025
    Why is the head pressure too low in my Carrier Air Conditioner?
    • S
      Stephanie CarlsonSep 5, 2025
      Low head pressure in your Carrier Air Conditioner could be due to a low refrigerant charge, so check for leaks, repair them, and recharge the system. Alternatively, there might be a restriction in the liquid tube, which you should remove. A dirty air filter in the indoor section could also be the cause, so clear the filter.
  • E
    Elizabeth FlemingSep 8, 2025
    What causes excessive section pressure in Carrier 38KLE28-H Air Conditioner?
    • J
      Jason DyerSep 8, 2025
      Excessive section pressure in your Carrier Air Conditioner can arise from a reversing valve that is stuck or has an internal leak, requiring replacement. It may also be caused by an internal pressure relief being open, so check for the source and eliminate it. Another reason might be overcharged refrigerant, in which case you should purge the excess refrigerant.
  • A
    Alexander ThomasSep 12, 2025
    Why has the outdoor fan stopped or is cycling on overload in my Carrier 38KLE28-H Air Conditioner?
    • D
      derekkennedySep 12, 2025
      If the outdoor fan in your Carrier Air Conditioner has stopped or is cycling on overload, it could be due to a defective fan motor capacitor, which should be replaced. Loose leads at the fan motor could also be the problem, so check for the cause and eliminate it. Additionally, the fan motor might be burned out, requiring replacement, or the motor bearing could be seized, so check for the cause and eliminate it.

Summary

1. PRECAUTIONS FOR SERVICE AND MAINTENANCE

2. SPLIT SYSTEM DESCRIPTION

5. SYSTEM OPERATING LIMITS

6. SYSTEM SAFETY PROTECTION

6-1 FOR HEAT PUMP SYSTEM

Details safety protection features specific to heat pump operation modes.

6-2 FOR COOL ONLY SYSTEM

Details safety protection features specific to cool-only operation modes.

11. WIRING DIAGRAM

INDOOR UNIT 42 KLE-H SERIES HEAT PUMP

Wiring diagram for the indoor unit of the 42KLE-H heat pump series.

INDOOR UNIT 42 KLE-C SERIES COOL ONLY

WIRING DIAGRAM (CONT.)

INDOOR UNIT 42 KLE39-E COOL;ELECTRIC HEAT

OUTDOOR UNIT 38 KLE-H SERIES HEAT PUMP

OUTDOOR UNIT 38 KLE-C SERIES COOL ONLY

12. FIELD ELECTRICAL CONNECTIONS MATCHING

HEAT PUMP SYSTEM

COOL ONLY SYSTEM

13. REFRIGERATION CYCLE

REFRIGERATION CYCLE (Cont.)

14. SELF-DIAGNOSTIC FUNCTION

14-1 INTRODUCTION

Introduction to the self-diagnostic function's importance in air conditioners.

14-2 EXPLANATION OF SELF-DIAGNOSTIC FUNCTION

Explanation of how the self-diagnostic function detects and reports malfunctions.

14-3 SELF-DIAGNOSTIC FUNCTION DESCRIPTION FOR HEAT PUMP SYSTEMS

Details self-diagnostic error codes for heat pump systems.

14-4 SELF-DIAGNOSTIC FUNCTION DESCRIPTION FOR COOL ONLY SYSTEMS

Details self-diagnostic error codes for cool-only systems.

18. PERIODICAL CHECKS

19. TROUBLE SHOOTING

Carrier 38KLE28-H Specifications

General IconGeneral
BrandCarrier
Model38KLE28-H
CategoryAir Conditioner
LanguageEnglish

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