CARRIER Air Conditioner Error Codes And Troubleshooting

Listed here is the CARRIER Air Conditioner Error Codes and how to troubleshoot. The CARRIER AC Error Codes tells you that there is an issue. This CARRIER AC Error Code will tell you weather the error is from withing the AC or is it due to something external unit. If you know the Meaning of the Error code then it will be very easy to troubleshoot and resolve the issue and fix CARRIER AC quickly and easily. Just Check the manual, then get it serviced or have it repaired or replace it. We have given the Error Code List for CARRIER Air Conditioners. Please also see the CARRIER AC pdf manual for more details.

CARRIER Air Conditioner Error Codes

CARRIER Air Conditioner Error Code 08
Error Code Meaning (18, 24, and 30K) : Defrost Mode 1
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code 0A
Error Code Meaning (18, 24, and 30K) : Defrost Mode 2
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code See Error Code Table
Error Code Meaning (18, 24, and 30K) : Inlet tube temperature sensor malfunction
Error Code Meaning (36 and 42K) : Inlet tube temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Indoor

CARRIER Air Conditioner Error Code See Error Code Table
Error Code Meaning (18, 24, and 30K) : Outlet tube temperature sensor malfunction
Error Code Meaning (36 and 42K) : Outlet tube temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Indoor

CARRIER Air Conditioner Error Code F0
Error Code Meaning (18, 24, and 30K) : Low charge or refrigeration system blockage
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F3
Error Code Meaning (18, 24, and 30K) : Outdoor ambient temperature sensor malfunction
Error Code Meaning (36 and 42K) : Outdoor ambient temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F4
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Outdoor mid —coil temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F5
Error Code Meaning (18, 24, and 30K) : Outdoor discharge air temperature sensor
Error Code Meaning (36 and 42K) : Outdoor discharge air temperature sensor
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F7
Error Code Meaning (18, 24, and 30K) : Cooling oil return cycle
Error Code Meaning (36 and 42K) : Cooling oil return cycle
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code E1
Error Code Meaning (18, 24, and 30K) : System high pressure protection
Error Code Meaning (36 and 42K) : System high pressure protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code E2
Error Code Meaning (18, 24, and 30K) : Indoor freeze protection
Error Code Meaning (36 and 42K) : Indoor freeze protection
Indoor and/or Outdoor Unit Error : Indoor

CARRIER Air Conditioner Error Code E3
Error Code Meaning (18, 24, and 30K) : System low pressure protection
Error Code Meaning (36 and 42K) : System low pressure protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code E4
Error Code Meaning (18, 24, and 30K) : Compressor discharge high temperature protection
Error Code Meaning (36 and 42K) : Compressor discharge high temperature protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code E6
Error Code Meaning (18, 24, and 30K) : Communication error between indoor and outdoor
Error Code Meaning (36 and 42K) : Communication error between indoor and outdoor
Indoor and/or Outdoor Unit Error : Indoor and outdoor

CARRIER Air Conditioner Error Code E7
Error Code Meaning (18, 24, and 30K) : Mode conflict
Error Code Meaning (36 and 42K) : Mode conflict
Indoor and/or Outdoor Unit Error : Indoor

CARRIER Air Conditioner Error Code E8
Error Code Meaning (18, 24, and 30K) : System overload protection
Error Code Meaning (36 and 42K) : System overload protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code E9
Error Code Meaning (18, 24, and 30K) : Cold Blow Protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Indoor

CARRIER Air Conditioner Error Code dd
Error Code Meaning (18, 24, and 30K) : Test mode
Error Code Meaning (36 and 42K) : Test mode
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code Fo
Error Code Meaning (18, 24, and 30K) : Pump down mode
Error Code Meaning (36 and 42K) : Pump down mode
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code P0
Error Code Meaning (18, 24, and 30K) : IPM Rest
Error Code Meaning (36 and 42K) : IPM Rest
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code P5
Error Code Meaning (18, 24, and 30K) : Compressor current protection
Error Code Meaning (36 and 42K) : Compressor current protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code P6
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Communication error between the inverter drive and main board
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code P7
Error Code Meaning (18, 24, and 30K) : Heat sink temperature sensor malfunction
Error Code Meaning (36 and 42K) : Heat sink temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code P8
Error Code Meaning (18, 24, and 30K) : IPM over temperature protection
Error Code Meaning (36 and 42K) : IPM over temperature protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code P9
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Open Contactor
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Codes And Troubleshooting

CARRIER Air Conditioner Error Code Pc
Error Code Meaning (18, 24, and 30K) : Current sensor malfunction
Error Code Meaning (36 and 42K) : Current sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code Pd
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Current sensor mis —wiring protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code PA
Error Code Meaning (18, 24, and 30K) : Input current protection
Error Code Meaning (36 and 42K) : Input current protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code PF
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Inverter board ambient temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code PL
Error Code Meaning (18, 24, and 30K) : Low voltage protection
Error Code Meaning (36 and 42K) : Low voltage protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code PH
Error Code Meaning (18, 24, and 30K) : High voltage protection
Error Code Meaning (36 and 42K) : High voltage protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code PP
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Abnormal input AC voltage
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code PU
Error Code Meaning (18, 24, and 30K) : Capacitor charging malfunction
Error Code Meaning (36 and 42K) : Capacitor charging malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code H1
Error Code Meaning (18, 24, and 30K) : Defrost or heating oil return cycle
Error Code Meaning (36 and 42K) : Heating oil return cycle
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code H2
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Forced defrost
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code H3
Error Code Meaning (18, 24, and 30K) : Compressor overheat protection
Error Code Meaning (36 and 42K) : Compressor overheat protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code H5
Error Code Meaning (18, 24, and 30K) : IPM Protection
Error Code Meaning (36 and 42K) : IPM Protection
Indoor and/or Outdoor Unit Error : Outdoor/Indoor

CARRIER Air Conditioner Error Code H7
Error Code Meaning (18, 24, and 30K) : Compressor speed reduction
Error Code Meaning (36 and 42K) : Compressor speed reduction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code Hc
Error Code Meaning (18, 24, and 30K) : PFC board protection
Error Code Meaning (36 and 42K) : PFC board protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code L9
Error Code Meaning (18, 24, and 30K) : Compressor high voltage protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code L9
Error Code Meaning (18, 24, and 30K) : Compressor high voltage protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code Lc
Error Code Meaning (18, 24, and 30K) : Compressor start —up failure
Error Code Meaning (36 and 42K) : Compressor start —up failure
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code Ld
Error Code Meaning (18, 24, and 30K) : Compressor phase loss protection
Error Code Meaning (36 and 42K) : Compressor phase loss protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code LE
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Compressor stalling
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code LF
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Compressor over —speed protection
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code A5
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Condenser coil inlet temp sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code A7
Error Code Meaning (18, 24, and 30K) : NA
Error Code Meaning (36 and 42K) : Condenser outlet temperature sensor malfunction
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code EE
Error Code Meaning (18, 24, and 30K) : Memory card error
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code En
Error Code Meaning (18, 24, and 30K) : Frequency limitation for module circuit protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code EU
Error Code Meaning (18, 24, and 30K) : Frequency limitation for module temperature protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F6
Error Code Meaning (18, 24, and 30K) : Frequency limitation for overload protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F8
Error Code Meaning (18, 24, and 30K) : Frequency limitation for system circuit protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code F9
Error Code Meaning (18, 24, and 30K) : Frequency limitation for module circuit protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code FH
Error Code Meaning (18, 24, and 30K) : Frequency limitation for module circuit protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code HE
Error Code Meaning (18, 24, and 30K) : Compressor demagnetizing protection
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code LP
Error Code Meaning (18, 24, and 30K) : Indoor and outdoor units mismatch
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor and Indoor

CARRIER Air Conditioner Error Code U1
Error Code Meaning (18, 24, and 30K) : Compressor phase detection malfunction
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code U3
Error Code Meaning (18, 24, and 30K) : Low DC bus voltage
Error Code Meaning (36 and 42K) : NA
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Code dn
Error Code Meaning (18, 24, and 30K) : Communication error between main board and EXV
Error Code Meaning (36 and 42K) : Communication error between main board and EXV
Indoor and/or Outdoor Unit Error : Outdoor

CARRIER Air Conditioner Error Codes

CARRIER Air Conditioner Error Code 13
Error Code Meaning : Unit A indoor pipe outlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 14
Error Code Meaning :Unit A indoor pipe inlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 15
Error Code Meaning : Unit A Indoor return air sensor malfunction

CARRIER Air Conditioner Error Code 16
Error Code Meaning : Unit A mode conflict

CARRIER Air Conditioner Error Code 17
Error Code Meaning : Unit A freeze protection

CARRIER Air Conditioner Error Code 41
Error Code Meaning : Unit D communication error

CARRIER Air Conditioner Error Code 42
Error Code Meaning : Indoor return air temperature sensor malfunction

CARRIER Air Conditioner Error Code 43
Error Code Meaning : Unit D indoor pipe outlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 44
Error Code Meaning : Unit D indoor pipe inlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 45
Error Code Meaning : Unit D Indoor return air temperature sensor malfunction

CARRIER Air Conditioner Error Code 23
Error Code Meaning : Unit B indoor pipe outlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 24
Error Code Meaning : Unit B indoor pipe inlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 25
Error Code Meaning : Unit B Indoor return air sensor malfunction

CARRIER Air Conditioner Error Code 26
Error Code Meaning : Unit B mode conflict

CARRIER Air Conditioner Error Code 27
Error Code Meaning : Unit B freeze protection

CARRIER Air Conditioner Error Code 46
Error Code Meaning : Unit D mode conflict

CARRIER Air Conditioner Error Code 47
Error Code Meaning : Unit D freeze protection

CARRIER Air Conditioner Error Code 51
Error Code Meaning : Unit E communication error

CARRIER Air Conditioner Error Code 52
Error Code Meaning : Unit E indoor pipe midway temperature sensor malfunction

CARRIER Air Conditioner Error Code 53
Error Code Meaning : Unit E indoor pipe outlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 33
Error Code Meaning : Unit C indoor unit pipe outlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 34
Error Code Meaning : Unit C indoor unit pipe inlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 35
Error Code Meaning : Unit C Indoor unit return air sensor malfunction

CARRIER Air Conditioner Error Code 36
Error Code Meaning : Unit C mode conflict

CARRIER Air Conditioner Error Code 37
Error Code Meaning : Unit C freeze protection

CARRIER Air Conditioner Error Code 54
Error Code Meaning : Unit E indoor pipe inlet temperature sensor malfunction

CARRIER Air Conditioner Error Code 55
Error Code Meaning : Unit E Indoor return air temperature sensor malfunction

CARRIER Air Conditioner Error Code 56
Error Code Meaning : Unit E mode conflict

CARRIER Air Conditioner Error Code 57
Error Code Meaning : Unit E freeze protection

CARRIER Air Conditioner Error Code C5
Error Code Meaning : Jumper missing on replacement indoor board

CARRIER Air Conditioner Error Codes And Troubleshooting

CARRIER Air Conditioner Issue : Indoor unit emits a bad odor on start–up
Reason
 Air filter dirty
 Output air still has odor after cleaning filter.
CARRIER Air Conditioner Solution
After turning unit off, wait at least 3 minutes before
trying to restart.
 Reset the circuit breaker or replace the fuse with
the specified replacement fuse.
 Restart operation when the power is restored.
 Call your service representative.
 Call your service representative.

CARRIER Air Conditioner Issue : You hear water flowing noise when the unit is running
Reason
This is normal and is the refrigerant flowing
through the system.
CARRIER Air Conditioner Solution
 No maintenance required

CARRIER Air Conditioner Issue : Indoor unit produces a mist when the air conditioner is running
Carrier AC Reason
 This is normal cooling and is caused by high
humidity and temperature in the room.
CARRIER Air Conditioner Solution
 No maintenance required. Mist should stop as
room is cooled down and the humidity is removed

CARRIER Air Conditioner Issue : Wireless remote control does not work
Carrier AC Reason
 Batteries are dead.
 Unit needs to be reset.
CARRIER Air Conditioner Solution
 See battery replacement section in this manual
and replace batteries.
 Turn off power to indoor unit. Remove plug from
wall and then reinsert plug. Restart unit.

CARRIER Air Conditioner Issue : Water leaks into room from Indoor unit
Carrier AC Reason
 Condensing water has overflowed
CARRIER Air Conditioner Solution
 Check indoor condensing drain or call your
representative.

CARRIER Air Conditioner Issue : Unit/System Does Not Work
Carrier AC Reason
 To protect the unit upon an immediate restart
after a stop, the system controller will delay
the unit for 3 minutes before allowing the unit
to start back up.
 The circuit breaker has tripped or a fuse
has blown.
 Power failure.
 Error codes displayed
 Voltage is too low
CARRIER Air Conditioner Solution
 After turning unit off, wait at least 3 minutes before
trying to restart.
 Reset the circuit breaker or replace the fuse with
the specified replacement fuse.
 Restart operation when the power is restored.
 Call your service representative.
 Call your service representative.

CARRIER Air Conditioner Issue : Cooling is Not Working Properly
Carrier AC Reason
 The filter is blocked with dust.
 Temperature is not set properly.
 A window or door is open.
 The outdoor unit is obstructed.
 The fan speed is too low.
 The operation mode is in Fan instead of
Cool.
CARRIER Air Conditioner Solution
 Clean the air filter.
 Check the temperature and reset if necessary.
 Close the window or door.
 Remove the obstruction.
 Change the fan speed selection.
 Change the operating mode to Cool or reset the
unit.

CARRIER Air Conditioner Issue : Heating is Not Working Properly
Carrier AC Reason
 The filter is blocked with dust.
 Temperature is set too low.
 A window or door is open.
 The outdoor unit is obstructed.
CARRIER Air Conditioner Solution
 Clean the air filter.
 Check the temperature and reset if necessary.
 Close the window or door.
 Remove the obstruction.

CARRIER Air Conditioner Issue : Unit Stops During Operation
Carrier AC Reason
 The Off timer is not operating correctly.
 Error codes displayed
CARRIER Air Conditioner Solution
 Restart the operating mode.
 Call your service representative.

We hope that now you are able to resolve all CARRIER Air Conditioner Error Codes. Please do comment for any questions related to air conditioners.