Carrier air conditioner troubleshooting

American Carrier air conditioners are distinguished by high run capacity and excellent ergonomics. And the system of troubleshooting, which in form of a table is represented below, will help to save time for their diagnostics and repairs.

Carrier ASBFE600BA air conditioner troubleshooting

PROBLEMPOSSIBLE CAUSESSOLUTION
Unit does not startCircuit breaker trippedReset only once. Should the unit trip again do not attempt to reset it again. Contact your Carrier service center for assistance.
Unit does not cool properly.a. Air filter is dirtya. Clean air filter.
b. Thermostat setting is too highb. Reset to desired temperature.
c. Unit on dry modec. Switch the setting into cool mode
d. Unit on sleep moded. Press sleep button
Condensate dripping into the roomDirty drain pan and clogged drain lineClean the drain pan and drain line.
No signal output from air conditioner controllerController’s battery is weakReplace controller with new battery of the same specs.

Carrier Elegant 53KFE60 air conditioner troubleshooting

TROUBLEPOSSIBLE CAUSESSOLUTIONS
After batteries have been placed into the remote control, the remote control can not operate the air conditioner.Batteries are exhausted or have the wrong polarity.Replace batteries or check polarity.
When pressing start button, unit does not acknowledge signal with a beep.
OR
When pressing stop button, unit does not acknowledge signal with a beep.
Main switch is OFF.Switch it to ON position.
Remote control batteries are exhausted.Replace batteries.
Remote control has not been pointed correctly to the receiver of unit.Turn remote control OFF and repeat the operation in the correct direction.
There are obstacles (curtains, walls, etc.) between the remote control and the unitRepeat the operation after having removed the obstacles.
Receiver on the unit or the remote control is under intense sun radiation.Avoid direct sun on the unit, shut curtains or shades.
Signal transmission is obstructed by severe interference from an electromagnetic field.Avoid sending signals when computers or household appliances (Food processors, coffee makers, etc.) are operating close by cellular or cordless telephones may also interfere with the control.
Air conditioner will not start.Main supply switch is OFFSwitch to ON
Fuses or main switch are blownReplace fuses
Protection against frequent compressor cycling is ONWait for 3 minutes.
Selected temperature is higher than the room temperature in the cooling mode.Correct selected temperature.
Air conditioner does not cool the room adequately.Air flow cannot circulate freelyRemove obstructions.
Dirty filters reduce air quantity circulating.Clean air filters
Doors and/or windows are open.Close doors and windows
Fan speed has been set to “Low”Set fan speed at high speed.
Selected temperature is higher than the room temperature in the cooling mode.Correct selected temperature.
Incidence of strong sun rays in the roomUse shut curtains or shades
Unit wrongly selected for the roomRedefines adequate unit for the room.
Ice or frost forms on the indoor coilInsufficient air circulationRemove instructions in front of the unit
Dirty air filterClean air filter
Air conditioner stops during coolingOFF Timer operation is workingCancel Off time operation
Set temperature is lower than room temperatureNormal operation
A slight whistling noise is heard when is heard when the air conditioner starts or stops.This is due to the refrigerant beginning to circulate or an adjustment of the refrigerant pressures.Normal operation
Unpleasant smells coming from the unit.Unpleasant smells can be caused by substances accumulated in the air filterSwitch the system OFF and contact an authorized service center to have the filters cleaned. Restart unit in the ventilation (fan only) mode and open windows to change room air.
Strange noises coming from the unit.Occasionally the unit can emit some strange short noises during operation or when it has stopped. These are generally due to the of temperature changes on the plastic parts.Normal operation
Water dripping inside the room to be air conditioned.Clogged drainRemove the obstructions from the drain
Incorrect installationCorrect the installation as described in this manual
Unit installed without the proper tilt to the outsideCorrect the tilting as described in this manual
Defect code appears. Defect code Er appears on the display of electronic control panel of the unitRoom air sensorCall carrier service and maintenance center or Carrier authorized dealer.
Defect code En appears on the display of electronic control panel of the unitIndoor coil sensorCall carrier service and maintenance center or Carrier authorized dealer.

Carrier PERFORMANCE 50VT-A air conditioner troubleshooting

SYMPTOMCAUSEREMEDY
Compressor and condenser fan will not start.Power failureCall power company
Fuse blown or circuit breaker trippedReplace fuse or reset circuit breaker
Defective contactor, transformer, or high-pressure, loss-of-charge or low-pressure switchReplace component
Insufficient line voltageDetermine cause and correct
Incorrect or faulty wiringCheck wiring diagram and rewire correctly
Thermostat setting too highLower thermostat setting below room temperature
Compressor will not start but condenser fan runsFaulty wiring or loose connections in compressor circuitCheck wiring and repair or replace
Compressor motor burned out. seized, or internal overload openDetermine cause Replace compressor
Defective run/start capacitor, overload, start relayDetermine cause and replace
One leg of 3-phase power deadReplace fuse or reset circuit breaker Determine cause
Three-phase scroll compressor makes excessive noise, and there may be a low pressure differential.Scroll compressor is rotating in the wrong directionCorrect the direction of rotation by reversing the 3-phase power leads to the unit.
Compressor cycles (other than normally satisfying thermostat).Refrigerant overcharge or underchargeRecover refrigerant, evacuate system, and recharge to capacities shown on rating plate
Defective compressorReplace and determine cause
Insufficient line voltageDetermine cause and correct
Blocked condenserDetermine cause and correct
Defective run/start capacitor, overload or start relayDetermine cause and replace
Defective thermostatReplace thermostat
Faulty condenser-fan motor or capacitorReplace
Restriction in refrigerant systemLocate restriction and remove
Compressor operates continuouslyDirty air filterReplace filter
Unit undersized for loadDecrease load or increase unit size
Thermostat set too lowReset thermostat
Low refrigerant chargeLocate leak, repair, and recharge
Mechanical damage in compressorReplace compressor
Air in systemRecover refrigerant, evacuate system, and recharge
Condenser coil dirty or restrictedClean coil or remove restriction
Excessive head pressureDirty air filterReplace filter
Dirty condenser coilClean coil
Refrigerant overchargedRecover excess refrigerant
Air in systemRecover refrigerant, evacuate system, and recharge
Condenser air restricted or air short-cyclingDetermine cause and correct
Head pressure too lowLow refrigerant chargeCheck for leaks, repair, and recharge.
Compressor IPR leakingReplace compressor
Restriction in liquid tubeRemove restriction
Excessive suction pressureHigh heat loadCheck for source and eliminate
Compressor IPR leakingReplace compressor
Refrigerant overchargedRecover excess refrigerant
Suction pressure too lowDirty air filterReplace filter
Low refrigerant chargeCheck for leaks, repair and recharge
Metering device or low side restrictedRemove source of restriction
Insufficient evaporator airflowIncrease air quantity. Check fitter—replace if necessary
Temperature too low in conditioned areaReset thermostat
Outdoor ambient below 55°P (12.7°C)Install low-ambient kit
Pilter drier restrictedReplace filter

Carrier Puron 38GLS-07G-703EC-40 air conditioner troubleshooting

ProblemSolutions
Compressor and fan of the outdoor unit will not start:• Unit not energized; check the mains power connections.
• Main switch OFF; check and put to the ON position.
• Main switch fuses have blown; replace.
• Wait for 3 minutes; compressor cycling protection is on.
• Pressure switch open; check and eliminate cause.
• Mains voltage too low.
• Electrical connections loose or wrong; check and repair.
Compressor will not start, but outdoor fan is running:• Electrical connections of compressor loose or wrong; check and repair.
• Compressor burnt out, seized or protection device on; check for the cause and replace compressor if necessary.
• Run capacitor faulty (single-phase models); replace.
Compressor starts, but stops due to its over temperature protection (other than stops caused by the normal operation of the thermostat):• Wrong refrigerant charge (excessive or low) or air or other non condensable gases in the circuit; drain refrigerant (see note 1), evacuate and recharge.
• Mains voltage wrong (too high or too low).
• Condenser coil (outdoor or indoor, in case of heat pump operation) obstructed; remove obstructions.
• Outdoor fan off; check cause and repair.
• Run capacitor faulty; check and replace.
• Wrong indoor unit thermostat; replace.
• Refrigerant circuit clogged; check and remove obstructions.
• Reversing valve faulty on heat pump models; replace.
• Expansion device clogged or covered with ice; drain refrigerant (see note 1), evacuate and recharge.
Compressor runs continuously:• Unit selected too small for actual air conditioning needs.
• Indoor temperature selection too low (if in cooling) or too high (if in heating, for heat pump models); check temperature selection.
• Refrigerant charge low; check and add refrigerant.
• Outdoor unit fan faulty; replace.
• Air or other non condensable gases in the circuit; drain refrigerant (see note 1), evacuate and recharge.
• Obstructions at air intake or dirty indoor unit filters; remove obstruction or clean filter.
Frequent ice build-up on outdoor coil (during heating with heat pump units):• Outdoor fan stopped; check cause and repair.
• Wrong electrical connections on defrost circuit; check electrical connections and repair.
Discharge pressure too high:• Outdoor coil dirty or obstructed; clean or remove obstructions.
• Condenser fan (outdoor or indoor, in case of heat pump operation) faulty; replace.
• Refrigerant charge too high; drain some refrigerant (see note 1). •Air or other non-condensable gases in the circuit; drain refrigerant (see note 1), evacuate and recharge.
Discharge pressure too low:• Refrigerant charge too low; add refrigerant.
• Outdoor coil dirty or obstructed; clean or remove obstructions.
• Indoor unit air filter dirty; clean filter.
Suction pressure too high:• Internal high pressure relief valve open; check for cause and repair.
• Refrigerant charge too high; drain some refrigerant (see note 1).
• Reversing valve (on heat pump models) faulty or internal leak; replace.
Suction pressure too low:• Refrigerant charge too low; add refrigerant.
• Evaporator coil (indoor or outdoor, in case of heat pump models).covered with ice; see the following points.
• Air circulation on the evaporator unit (indoor or outdoor, in case of heat pump models) not sufficient; check for the cause and repair.
• Expansion device or suction line clogged: check and repair.
• Outdoor fan does not stop during defrost periods (when heating with heat pump models); check electrical connections.
• Defrost thermostat faulty (heating with heat pump models); replace.
• Contact between tube and defrost thermostat (heating with heat pump models) faulty; check and repair.
• Relay or defrost timer faulty; replace.
Outdoor fan cycling due to its overtemperature protection:• Fan capacitor faulty; replace.
• Electrical connection loose; check connections.
• Fan bearing seized; check and repair.
• Expansion device clogged or covered with ice; drain refrigerant (see note 1), evacuate and recharge.
• Defrost relay open (heating with heat pump models); replace.
Outdoor fan motor running always at low speed:• Wiring not connected to the board; check connections between temperature sensor and board.
• Temperature sensor is fault; replace the sensor.
• Electronic board broken; replace board.
Outdoor fan motor running always at high speed:• Temperature sensor is short circuited; replace temperature sensor.
• Electronic board broken; replace board.

Carrier ZH*** series air conditioner troubleshooting

OCCURRENCEPROBABLE CAUSESSOLUTIONS
The air conditioner does not operate1. Circuit breaker off1. Turn on the circuit breaker again
2. Power supply cable disconnected from the electric current2. Connect the cable to the socket
3. Power failure3. Wait until the power supply is re-established
The air conditioner does not cool or does not heat properly1. Dirty air fitter1. Clean the air filter
2. Obstruction in the air flow2. Remove the obstructions: curtains, couches, etc.
3. Open room3. Close the doors and windows
4. Heat source in the room4. Eliminate the heat source
5. Thermostat button improperly positioned5. Adjust the conditioner controls properly
6. Unit improperly dimensioned for the room6. Redefine the unit model choosing a proper one for the room
7. Strong sunrays entering into the room7. Block the rays, but do not obstruct the air flow
Inside heat exchanger is frozen1. Insufficient air circulation1. Unobstruct the appliance front
2. Dirty air filter2. Clean the air filter
Water leaks to the inside of the room1. Obstructed drain1. Unobstruct the drain
2. Incorrect installation.2. Correct the installation, according to the instructions of this Manual
3. Cabinet installed without the outward inclination3. Correct the inclination, as described in this Manual
Compressor does not start1. Voltage below the normal level 1115V or Z20V]1. Contact the power supply services in your region
2. Unit turned off. and turned on immediate^ after2. Wait 3 minutes to turn on again
Water noise in the appliance1. Excessive accumulation of condensation water inside the appliance1. Use the Draining System through the bottom outlet(using the drain pan)
Message on the display (electronic models]1. Failure in the inside temperature sensor1. Contact the Authorized Technical Assistance
E42. Failure in the outside temperature sensor2. Contact the Authorized Technical Assistance
E53. Dirty filter3. Clean the filter, foiling the instructions on page 23
Remote control does not operateT. Batteries without charge2. Damaged remote control1. Replace the batteries
2. Use the electronic panel until the damaged control is replaced

Error codes and troubleshooting