Carrier 38AUQ appendix LED Status Codes, Lockout

Page 29

Table 14 — LED Status Codes

Status LED

Status LED Description

Status LED Troubleshooting Information

Green “POWER”

Module has power

Supply voltage is present at module terminals

Red “TRIP”

Thermostat demand signal Y

1.

Compressor protector is open

LED On Solid

is present, but the

2.

Condensing unit power disconnect is open

 

compressor is not running.

 

3.

Compressor circuit breaker or fuse(s) is open

 

 

 

 

4.

Broken supply wires or connector is not

 

 

 

making contact

 

 

5.

Compressor power wires not routed through

 

 

 

Comfort Alert

 

 

6.

Compressor contactor has failed open

Red “TRIP” LED

The anti-short cycle timer (3

minutes), in module is preventing compressor

Flashing

restart.

 

 

 

Module locks out

compressor when compressor damaging ALERT code appears.

Lockout ALERT codes are noted in the Status LED Description.

During a compressor lock out, 24VAC power must be removed from module to manually reset.

Yellow “ALERT”

A short circuit or over current

1.

Compressor contactor coil shorted

LED On Solid

condition exists on PROT

2.

Electrical load too high for PROT circuit

 

terminal.

 

 

(maximum 1 Amp)

 

 

 

 

 

3.

24 V AC wired directly to PROT terminal

Yellow “ALERT”

System Pressure Trip

1.

High head pressure

Flash Code 2

Discharge pressure out of

2.

Condenser coil poor air circulation (dirty,

 

limits or compressor

 

 

blocked, damaged)

 

overload (if no high pressure

 

 

3.

Condenser fan is not running

 

switch in system)

 

LOCKOUT

4.

If low pressure switch is open:

 

 

 

Refer to Code 3 for troubleshooting

Yellow “ALERT”

Short Cycling

1.

If low pressure switch is open:

Flash Code 3

Compressor is running only

 

a.

Low refrigerant charge

 

briefly LOCKOUT

 

 

 

b. Evaporator blower is not running

 

 

 

 

 

 

c. Evaporator coil is frozen

 

 

 

d.

Faulty metering device

 

 

 

e.

Condenser coil is dirty

 

 

 

f.

Liquid line restriction (filter drier blocked if

 

 

 

 

present)

 

 

2.

If high pressure switch is open, go to Flash

 

 

 

Code 2 information

 

 

3.

Intermittent thermostat demand signal

 

 

4.

System or control board defective

Yellow “ALERT”

Locked Rotor

1.

Low line voltage to compressor

Flash Code 4

LOCKOUT

2.

Excessive liquid refrigerant in compressor

 

 

 

 

3.

Compressor bearings are seized

Yellow “ALERT”

Open Circuit

1.

Condensing unit power disconnect is open

Flash Code 5

 

2.

Compressor circuit breaker or fuses are open

 

 

 

 

3.

Compressor contactor has failed open

 

 

4.

High pressure switch is open and requires

 

 

 

manual reset

 

 

5.

Broken supply wires or connector is not

 

 

 

making contact

 

 

6.

Unusually long compressor protector reset

 

 

 

time due to extreme ambient temperature

 

 

7.

Compressor windings are damaged

Yellow “ALERT”

Missing Phase

1.

Compressor fuse is open on one phase

Flash Code 6

LOCKOUT

2.

Broken wire or connector on one phase

 

 

 

 

3.

Compressor motor winding is damaged

 

 

4.

Utility supply has dropped one phase

Yellow “ALERT”

Reverse Phase

1.

Compressor running backward due to supply

Flash Code 7

LOCKOUT

 

phase reversal

Yellow “ALERT”

Welded Contactor

1.

Compressor contactor has failed closed

Flash Code 8

Compressor always runs

2.

Thermostat demand signal not connected to

 

 

 

module

Yellow “ALERT”

Low Voltage

1.

Control circuit transformer is overloaded

Flash Code 9

Control circuit < 18VAC

2.

Low line voltage to compressor

 

 

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Contents Safety Considerations ContentsInstallation Installation GuidelineReplacement /Retrofit R22 to Puron 38AUQ*07-12 Unit Dimensions Operating Charge, Typical lb† Pressurestat Settings psig High CutoutShipping Charge lb Qty...TypePressurestat Settings kPa High Cutout Operating Weight kg Aluminum-Fin CoilsNominal Capacity kW Operating Charge, Typical kg†Model Type Service OptionsType of Coil Refrigerant OptionsInstallation Puron-duty Filter Driers 38AUQ*07-12 Piping Recommendations Single-Circuit UnitMaximum Vertical Separation Insulation for Vapor Line Exposed To Outdoor Conditions Refrigerant Specialties Part NumbersComplete Electrical Connections Install AccessoriesField Power Supply Units with Factory-Installed Disconnect Units Without Factory-Installed DisconnectConvenience Outlets All unitsConvenience Outlet Location Installing Weatherproof CoverThermostat Field Control WiringElectrical Data 38AUQ*07-12 Hz Units START-UP PRE-START-UPAdjust Refrigerant Charge Advanced Scroll Temperature Protection AstpStart Unit Final Checks38AUQ*07 Charging Chart 38AUQ Wiring Diagram 208/230-3-60 shown Base Unit Controls Operating SequenceService Routine System MaintenanceQuarterly Inspection 30 days after initial start Refrigeration SystemRefrigerant System Pressure Access Ports Field Refrigerant Access PortsLiquid Line Filter Drier Outdoor Coil Metering DevicesCompressor Protection Heat Pump ControlsCrankcase Heater Commercial Defrost ControlDefrost Dip Switch PositionReversing valve control Compressor controlDefrost Speedup Functions Indoor Fan Off DelayDefrost Thermostats Fans Service Valves 38AUQ*08 Exterior 38AUQ*12 Exterior Input Comfort Alert Diagnostic ModuleLockout LED Status CodesPeriodic Clean Water Rinse Outdoor Coil Maintenance and Cleaning RecommendationRoutine Cleaning of Indoor Coil Surfaces LubricationTorque Values Service PartsFastener Torque Values Troubleshooting Appendix B Appendix aCatalog No 38AUQ-01SI Appendix CPreliminary Information CUT Along Dotted Linecut Along Dotted Line

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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