Carrier 38AUZ User Manual (English)

Questions and Answers:

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Christina BrooksAug 14, 2025
What to do if my Carrier 38AUZ Air Conditioner compressor is running but cooling is insufficient?
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  Robert ReynoldsAug 14, 2025
  If the Carrier Air Conditioner compressor is running but cooling is insufficient, it could be due to several reasons. These include low suction pressure or refrigerant charge (add refrigerant), low head pressure (check refrigerant charge and outdoor-air fan thermostat settings), dirty air filters (clean or replace filters), or a defective expansion valve power head (replace power head). Other possible causes are a partially iced indoor coil (check low-pressure setting), restricted indoor airflow (remove obstruction), high suction pressure (check unloader adjustments and setting), non-functioning unloaders (check unloader adjustments and setting), or excessive heat load (check for open doors or windows near the fan coil).
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Randy PayneAug 25, 2025
Why is my Carrier 38AUZ Air Conditioner unit operating too long or continuously?
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  Carlos CarterAug 25, 2025
  If your Carrier Air Conditioner operates too long or continuously, it could be due to a low refrigerant charge (add refrigerant), fused control contacts (replace control), air in the system (purge and evacuate system), or a partially plugged expansion valve or filter drier (clean or replace).
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perrymichelleAug 31, 2025
Why is my Carrier 38AUZ system noisy?
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  Christina ThompsonAug 31, 2025
  If the Carrier Air Conditioner system is noisy, it may be due to piping vibration (support piping as required) or a noisy compressor (replace compressor if bearings are worn).
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Michael HaasSep 3, 2025
Why does my Carrier 38AUZ Air Conditioner compressor lose oil?
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  Mark OrozcoSep 3, 2025
  The Carrier Air Conditioner compressor may lose oil due to a leak in the system (repair leak), crankcase heaters not energized during shutdown (check wiring and relays, and replace heater if defective), or improper interconnecting piping design (check piping for oil return and replace if necessary).
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Audrey GreenSep 6, 2025
Why is the liquid line hot in my Carrier 38AUZ?
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  summersbarrySep 6, 2025
  A hot liquid line in the Carrier Air Conditioner can be caused by a shortage of refrigerant due to a leak (repair leak and recharge) or an expansion valve that opens too wide (adjust expansion valve).
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Isaac RandolphSep 9, 2025
What causes a frosted liquid line on a Carrier 38AUZ?
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  James BakerSep 10, 2025
  A frosted liquid line in the Carrier Air Conditioner can be caused by a restricted filter drier (remove restriction or replace) or a liquid line solenoid valve that is partially closed (replace valve).

Carrier 38AUZ Specifications

General

Phase	1
Voltage	208/230 V
Outdoor Unit Dimensions (HxWxD)	Vary depending on model
Indoor Unit Weight	Vary depending on model
Outdoor Unit Weight	Vary depending on model