Arctic King Air Conditioners Error Codes

C0

Display shows C0; unit may still operate but indicates a sensor or configuration issue.

Configuration / Optional Sensor Not Detected

E1

Unit stops cooling and displays E1 on the control panel; buttons may be unresponsive until power is cycled.

Indoor Temperature Sensor (Room Thermistor) Fault

E2

Unit displays E2 and may run the fan but not cool properly; sometimes cycles off prematurely.

Evaporator Coil Temperature Sensor Fault

E3

Display shows E3; unit may shut down cooling or run erratically, sometimes with the outdoor section not engaging properly.

Condenser Coil / Outdoor Temperature Sensor Fault

E4

Unit displays E4 and may stop cooling; sometimes accompanied by coil icing or frequent compressor cycling.

Defrost / Evaporator Overheat Protection Fault

E5

Display shows E5; unit may not start the compressor or may shut down shortly after starting.

Overcurrent / Voltage Protection Fault

E6

Unit shows E6 and may not respond to remote commands or may not start certain functions.

Communication Fault Between Display Board and Main PCB

E7

Display shows E7; unit may run fan only or shut down cooling; sometimes appears after long operation in high heat.

Compressor Discharge Temperature Sensor Fault

E8

Unit displays E8 and may shut down or run at reduced capacity; sometimes accompanied by very low airflow or icing.

High-Temperature / Overload Protection or Overload of Indoor Fan

E9

Display shows E9; unit may not start or may shut down unexpectedly, often after a power outage or surge.

EEPROM / Memory Error on Main Control Board

F0

Portable Arctic King air conditioner displays F0 and stops cooling; fan may continue to run.

Low Refrigerant / Refrigerant System Protection Fault (Model-Specific)

F1

Portable or window unit shows F1; unit may run fan but not cool effectively.

Indoor Ambient Temperature Sensor Error (Alternate Code)

F2

Display shows F2; unit may shut down cooling or run erratically.

Evaporator Coil Sensor Error (Alternate Code)

F3

Unit displays F3 and may not start the compressor or may shut down under high load.

Condenser Coil Sensor Error (Alternate Code)

F4

Display shows F4; unit may shut down or run only in fan mode.

Compressor Discharge Sensor Error (Alternate Code)

F5

Portable unit shows F5 and stops cooling; may run fan intermittently.

Water Tank Full / Condensate Level Fault

H1

Unit displays H1 and may run in a low-power mode or delay compressor start.

Defrost / Low Ambient Heating Protection (Heat Pump Models)

H3

Unit shows H3 and shuts down compressor; fan may continue to run.

Compressor Overload Protection

H4

Unit displays H4 and stops heating or cooling; may restart after a long delay.

Inverter Module / Compressor Drive Fault (Inverter Models)

H5

Unit shows H5 and will not start compressor; fan may still operate.

IPM (Intelligent Power Module) Protection / Inverter Overcurrent

P1

Portable Arctic King unit displays P1 and stops cooling; fan may continue to run.

Bottom Tray Full / Condensate Pump Protection

P2

Portable unit shows P2; cooling stops until water is drained.

Upper Water Tank Full (Portable AC Specific)

Symptom

Air conditioner runs but does not cool the room effectively; air from vents is only slightly cool or room temperature.

Insufficient Cooling Capacity / Loss of Refrigerant Charge

Symptom

Burning or electrical smell when the unit is operating.

Overheating Electrical Component

Symptom

Display works but shows incorrect room temperature (much higher or lower than actual), causing poor temperature control.

Room Temperature Sensing Error

Symptom

Front panel buttons do not respond or respond intermittently, but the display is lit.

Keypad / Control Panel Failure

Symptom

High-pitched squealing or grinding noise from the indoor unit when the fan is running.

Indoor Blower Motor or Bearing Failure

Symptom

Loud rattling or vibrating noise during operation, especially when the compressor starts.

Excessive Vibration / Loose Components

Symptom

Outdoor section makes loud buzzing or humming, especially when the compressor tries to start.

Compressor Hard Start / Locked Rotor

Symptom

Remote control does not operate the unit, but the unit works from the front panel buttons.

Remote Control / IR Receiver Failure

Symptom

Unit blows air but there is a musty or moldy odor when it runs.

Biological Growth on Evaporator Coil and Drain Pan

Symptom

Unit blows warm air in cooling mode even though the compressor appears to be running.

Airflow Misrouting / Reversing Valve or Ducting Issue (Heat Pump/Portable)

Symptom

Unit does not turn on at all; no lights or display when pressing the power button.

No Power / Dead Control

Symptom

Unit emits clicking or popping sounds from inside the cabinet during operation.

Thermal Expansion / Plastic Panel Movement or Relay Operation

Symptom

Unit fan runs but airflow from the front grille is very weak, even on high speed.

Restricted Indoor Airflow

Symptom

Unit frequently turns on and off (short cycling) without adequately cooling the room.

Short Cycling / Thermostat Control Issue

Symptom

Unit is excessively loud outdoors, with clanking or metal-on-metal sounds.

Outdoor Fan or Compressor Mounting Failure

Symptom

Unit leaks water inside the room, dripping from the front panel or around the filter area.

Condensate Drainage Failure

Symptom

Unit powers on but compressor never starts; only the fan runs and air is not cold.

Compressor Start Failure

Symptom

Unit runs for a few minutes then shuts off completely and will not restart until cooled down.

Thermal Overload / Overheating Protection

Symptom

Unit trips the household circuit breaker or blows fuses when starting or shortly after.

Overcurrent / Short Circuit