Carrier 38AKS012, 38AK007, 38AKS009, 38AKS008, 38AK008 Troubleshooting Guide, Symptom Cause Remedy

Page 13

TROUBLESHOOTING GUIDE

SYMPTOM

CAUSE

REMEDY

Compressor does not run —

Power off.

Restore power.

Contactor open

 

 

Fuses blown.

Replace with correct fuses after finding cause and correcting.

 

 

Transformer open/shorted.

Replace transformer if primary windings are receiving power and

 

 

no output.

 

Thermostat circuit open.

Check thermostat setting.

 

Low-pressure switch open.

Check for refrigerant undercharge or system leak.

 

High-pressure switch open.

Check for refrigerant overcharge or obstruction of outdoor airflow.

 

Connections loose.

Tighten all connections.

 

Compressor motor thermostat open.

Check for excessive motor temperature.

Compressor does not run —

Compressor leads loose, broken.

Check connections with power off.

Contactor closed

 

 

Single phasing.

Replace blown fuse.

 

 

Compressor internal overload open.

Allow compressor motor windings to cool down to reset overload.

 

 

Determine cause for overload opening.

Compressor cycles on high-

High-pressure switch faulty.

Replace switch.

pressure switch —

Airflow restricted. Dirty coil.

Remove obstruction, clean condenser coil.

Condenser fan on

Air recirculating.

Clear airflow area.

 

 

Noncondensables in system.

Recover, evacuate and recharge as required. Refer to Carrier

 

 

GTAC-II, Module 5, Charging, Recovery, Recycling, and

 

 

Reclamation.

 

Refrigerant overcharge.

Recover as required.

 

Refrigerant system restrictions.

Check or replace filter drier, expansion valve, etc.

Compressor cycles on high-

Fan slips on shaft.

Tighten fan hub screws.

pressure switch —

 

 

Motor not running.

Check power and capacitor 1/3 and 3/4 hp motor.

Condenser fan off

 

 

Motor bearings seized.

Replace motor.

 

 

Motor overload open.

Check overload rating. Check for fan blade obstruction.

 

Motor burned out, windings open.

Replace motor.

Compressor cycles on low-

Filter drier plugged.

Replace filter drier.

pressure switch —

 

 

Expansion valve power head

Replace power head.

Evaporator fan running

defective.

 

 

 

 

Low refrigerant charge.

Find leak, repair, evacuate system, and recharge.

 

Expansion valve restricted/plugged.

Remove and replace expansion valve.

Airflow restricted —

Evaporator coil iced up.

Check refrigerant charge.

Low suction pressure

Evaporator coil dirty.

Clean coil fins.

 

 

Indoor-air filter dirty.

Clean or replace filters.

 

Indoor-air dampers closed.

Check damper operation and position.

Indoor (evaporator) fan stopped —

Electrical connections loose.

Tighten all connections.

Low suction pressure

 

 

Fan relay defective.

Replace relay.

 

 

Motor overload open.

Check power supply.

 

Motor defective.

Replace motor.

 

Fan belt broken or slipping.

Replace or tighten belt.

Compressor runs but cooling

Refrigerant charge low.

Add charge.

insufficient —

Head pressure low.

Check refrigerant charge.

Suction pressure low

Indoor-air filters dirty.

Clean or replace filters.

 

 

Expansion valve power head

Replace power head.

 

defective.

 

 

Expansion valve restricted/plugged.

Remove and replace expansion valve.

 

Evaporator coil partially iced.

Check low-pressure setting.

 

Evaporator airflow restricted.

Remove obstruction.

Compressor runs but cooling

Heat load excessive.

Check for open doors or windows.

insufficient —

 

 

Reverse rotation.

Check compressor rotation (see page 9).

Suction pressure high

 

 

NOTE: See Fig. 15 for component arrangements.

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Contents Safety Considerations ContentsInstallation Unit Physical Data 50/60 Hz EnglishRefrigerant Compressor Condenser CoilPhysical Data 50/60 Hz SI Rig and Mount the Unit Weight DistributionRefrigerant Piping Sizes 60 Hz Refrigerant Piping Sizes 50 HzDimensions ft-in Liquid Line Data 60 Hz Make Electrical ConnectionsLiquid Line Data 50 Hz MAX Liquid Line Unit AllowableElectrical Data Length Insulation Size Rating C AWG Field Control Wiring Raceway 38AKS Unit ShownPreliminary Checks START-UPCooling Charging Chart 38AK008,012 38AKS008,009,012 60 Hz Low-Pressure/Loss-of-Charge Switch LPSCondenser-Fan Adjustment Fig ServiceOil Charge Tables 1A and 1B LubricationCondenser-Fan Adjustment Symptom Cause Remedy Troubleshooting GuideCLO CAPGND OFCPreliminary Information START-UP ChecklistII. Pre-Start-Up Check Voltage Imbalance III. Start-Up
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38AK012, 38AKS009, 38AKS012, 38AKS008, 38AK008 specifications

The Carrier 38AK007 is a state-of-the-art air conditioning system designed for optimal comfort, efficiency, and reliability, making it a standout choice for residential and commercial applications. This model exemplifies Carrier's commitment to innovation and energy efficiency, catering to diverse cooling needs.

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