TROUBLESHOOTING

PROBLEM

CAUSE

REMEDY

Compressor and

Power failure.

Call power company.

Outdoor Fan

 

 

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker. Determine root cause.

Will Not Start.

 

Defective thermostat, contactor, transformer,

Replace component.

 

control relay, or capacitor.

 

 

Insufficient line voltage.

Determine cause and correct.

 

 

 

 

Incorrect or faulty wiring.

Check wiring diagram and rewire correctly.

 

 

 

 

Thermostat setting too high.

Lower thermostat setting below room temperature.

 

 

 

 

High pressure switch tripped.

See problem ``Excessive head pressure.''

 

 

 

 

Low pressure switch tripped.

Check system for leaks. Repair as necessary.

 

 

 

 

Freeze-up protection thermostat tripped.

See problem ``Suction pressure too low.''

 

 

 

Compressor Will Not

Faulty wiring or loose connections in compressor

Check wiring and repair or replace.

Start But Outdoor

circuit.

 

Fan Runs.

 

 

Compressor motor burned out, seized, or

Determine cause. Replace compressor or allow enough time for

 

internal overload open.

internal overload to cool and reset.

 

 

 

 

Defective run/start capacitor, overload, start

Determine cause and replace compressor.

 

relay.

 

 

One leg of 3-phase power dead.

Replace fuse or reset circuit breaker. Determine cause.

 

 

 

Compressor Cycles

Refrigerant overcharge or undercharge.

Recover refrigerant, evacuate system, and recharge to nameplate.

(Other Than

 

 

Defective compressor.

Replace and determine cause.

Normally Satisfying

Thermostat).

Insufficient line voltage.

Determine cause and correct.

 

 

 

 

Blocked outdoor coil or dirty air filter.

Determine cause and correct.

 

 

 

 

Defective run/start capacitor, overload, or start

Determine cause and replace.

 

relay.

 

 

Defective thermostat.

Replace thermostat.

 

 

 

 

Faulty outdoor-fan (cooling) or indoor-fan

Replace.

 

(heating) motor or capacitor.

 

 

Restriction in refrigerant system.

Locate restriction and remove.

 

 

 

Compressor Operates

Dirty air filter.

Replace filter.

Continuously.

 

 

Unit undersized for load.

Decrease load or increase unit size.

 

 

 

 

 

Thermostat set too low (cooling).

Reset thermostat.

 

 

 

 

Low refrigerant charge.

Locate leak; repair and recharge.

 

 

 

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

 

 

 

Outdoor coil dirty or restricted.

Clean coil or remove restriction.

 

 

 

Compressor Makes

Compressor rotating in the wrong direction.

Reverse the 3-phase power leads as described in

Excessive Noise.

 

Start-Up.

Excessive Head

Dirty outside air or return air filter (heating).

Replace filter.

Pressure.

 

 

Dirty outdoor coil (cooling).

Clean coil.

 

 

 

 

 

Refrigerant overcharged.

Recover excess refrigerant.

 

 

 

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

 

 

 

Condensing air restricted or air short-cycling.

Determine cause and correct.

 

 

 

Head Pressure

Low refrigerant charge.

Check for leaks; repair and recharge.

Too Low.

 

 

Compressor scroll plates defective.

Replace compressor.

 

 

 

 

 

Restriction in liquid tube.

Remove restriction.

 

 

 

Excessive Suction

High heat load.

Check for source and eliminate.

Pressure.

 

 

Compressor scroll plates defective.

Replace compressor.

 

 

 

 

 

Refrigerant overcharged.

Recover excess refrigerant.

 

 

 

Suction Pressure

Dirty air filter (cooling).

Replace filter.

Too Low.

 

 

Dirty or heavily iced outdoor coil (heating).

Clean outdoor coil. Check defrost cycle operation.

 

 

 

 

 

Low refrigerant charge.

Check for leaks; repair and recharge.

 

 

 

 

Metering device or low side restricted.

Remove source of restriction.

 

 

 

 

Insufficient indoor airflow (cooling mode).

Increase air quantity. Check filter and replace if necessary.

 

 

 

 

Temperature too low in conditioned area.

Reset thermostat.

 

 

 

 

Field-installed filter drier restricted.

Replace.

 

 

 

 

Outdoor ambient below 25°F (cooling).

Install low?ambient kit.

 

 

 

 

Outdoor fan motor(s) not operating (heating).

Check fan motor operation.

 

 

 

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Carrier 38AUQ appendix Troubleshooting
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38AUQ specifications

The Carrier 38AUQ is a versatile and efficient air conditioning unit designed to meet a variety of residential and light commercial cooling needs. Known for its advanced technology and robust performance, the 38AUQ model showcases Carrier's commitment to sustainability and energy efficiency.

One of the standout features of the Carrier 38AUQ is its use of variable-speed inverter technology. This allows the unit to adjust its cooling output in response to the temperature demands of the environment. By operating at multiple speed levels, it minimizes energy consumption and maximizes comfort, ensuring a consistent, quiet cooling experience.

The 38AUQ is equipped with a high-efficiency compressor, which helps to further enhance its energy performance. This component plays a critical role in ensuring that the unit operates smoothly, reducing both electricity bills and the environmental impact. Efficiency ratings often exceed industry standards, making the 38AUQ a suitable choice for those looking to reduce their carbon footprint while enjoying a comfortable indoor climate.

In terms of design, the Carrier 38AUQ boasts a compact and sleek profile that allows for easy installation in a variety of settings. Its durable construction is built to withstand harsh weather conditions, ensuring longevity and reliability. Additionally, an advanced air purification system is integrated, featuring filters that capture airborne particles, improving indoor air quality.

The unit also offers a range of smart features, including compatibility with smart home systems. Users can remotely control their air conditioning via smartphone apps, allowing for customizable settings and energy management from anywhere. This connectivity aligns with modern living preferences, enhancing convenience and control.

Furthermore, the Carrier 38AUQ is designed with noise reduction in mind. The advanced sound-absorbing materials and quiet operation of its fan and compressor make it one of the quieter air conditioning options on the market. This is particularly beneficial for residential applications, where noise can be a significant concern.

Overall, the Carrier 38AUQ combines cutting-edge technology, energy efficiency, and user-friendly features, making it a top choice for both homeowners and small business operators seeking reliable cooling solutions. Its commitment to performance and efficiency makes it a standout model in the Carrier air conditioning lineup.
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