Tristar
Tristar Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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CF
Unit displays CF after extended operation; cooling may still work but airflow is reduced.
Filter Cleaning Reminder
E0
Indoor unit will not respond to remote, display shows E0 and unit does not start cooling or heating.
Indoor Unit EEPROM Communication Error
E1
Indoor unit stops shortly after starting, display shows E1 and unit will not run continuously.
Indoor–Outdoor Communication Failure
E2
Unit stops cooling and displays E2; indoor fan may continue to run but compressor stops.
Indoor Evaporator Coil Temperature Sensor Fault
E3
Outdoor unit stops, indoor unit shows E3; system may start then quickly shut down.
Outdoor Coil Temperature Sensor Fault
E4
Unit stops and displays E4; may occur after running for some time, especially in cooling mode.
High-Pressure Protection / Overload Protection
E5
Unit attempts to start but quickly stops and displays E5; sometimes accompanied by humming from outdoor unit.
Compressor Overcurrent / Overload Protection
E6
Indoor unit shows E6 and stops; may occur during defrost or mode change on heat pump models.
Indoor Fan Motor Fault / Feedback Error
E7
Unit displays E7 and will not start compressor; sometimes occurs after installation or wiring changes.
Outdoor Fan Motor Fault / Feedback Error
E8
Unit stops and displays E8; may be accompanied by reduced airflow and ice on indoor coil.
Indoor Coil Freeze Protection / Low Evaporator Temperature
E9
Unit shows E9 and may shut down unexpectedly; sometimes associated with water leakage from indoor unit.
Full Condensate Pan / Drainage Fault
EC
Unit shows EC and stops cooling; may restart and then show EC again.
Refrigerant Leak Detection / Low Refrigerant Protection
F0
Unit displays F0 and does not cool effectively; compressor may not start.
Refrigerant Undercharge / Low Pressure Protection
F1
Indoor unit displays F1 and stops; may occur immediately at startup.
Room Air Temperature Sensor Fault
F2
Unit shows F2 and may run erratically, overshooting set temperature.
Indoor Pipe Temperature Sensor Fault
F3
Outdoor unit stops and F3 is displayed; may occur in heating mode on heat pump models.
Outdoor Pipe Temperature Sensor Fault
F4
Unit displays F4 and does not start compressor; fan may still run.
Compressor Discharge Temperature Protection
F5
Unit shows F5 and may cycle on and off frequently; performance is poor.
Outdoor Ambient Temperature Sensor Fault
F6
Unit displays F6 and may not respond correctly to remote commands.
Indoor PCB–Display Panel Communication Error
H1
Display shows H1; unit does not blow warm air for several minutes in heating mode.
Defrost Mode Active (Information Code)
H3
Unit stops and displays H3; may occur during heavy load in cooling or heating.
Compressor Overload Protection (Thermal Trip)
H5
Unit displays H5 and will not start compressor; fans may still operate.
IPM / Inverter Module Protection
P0
Unit shows P0 and may not start or may run at reduced capacity.
DC Bus Voltage Protection / Power Supply Fault
P1
Portable or window-type Tristar air conditioner displays P1 and stops cooling; water tank icon may flash.
Full Condensate Tank / Water Level Protection
P2
Portable Tristar unit shows P2 and stops; may occur in dehumidify mode.
Secondary Water Level Protection / High-Level Alarm
Symptom
Air conditioner runs but does not cool the room effectively; supply air feels only slightly cooler than room air.
Insufficient Cooling Capacity / Performance Degradation
Symptom
Burning or electrical smell from indoor or outdoor unit during operation.
Overheating Electrical Component
Symptom
Indoor unit has power but will not start cooling when commanded; display and fan may work.
Compressor Not Starting
Symptom
Indoor unit makes loud rattling or clicking noises when the fan is running.
Indoor Fan Noise / Foreign Object in Blower
Symptom
Outdoor unit is very noisy during operation; rattling, buzzing, or grinding sounds are heard.
Outdoor Mechanical Noise / Vibration
Symptom
Remote control does not operate the Tristar air conditioner; unit can still be controlled from the panel (if present).
Remote Control / IR Receiver Failure
Symptom
Strong musty or moldy smell from the indoor unit when it starts.
Biological Growth on Evaporator and Drain Pan
Symptom
Unit blows air but airflow is very weak even at high fan speed.
Restricted Airflow / Fan Performance Loss
Symptom
Unit displays correct temperature but actual room temperature is much higher or lower than setpoint.
Temperature Sensing / Calibration Error
Symptom
Unit does not turn on at all; no lights or display on indoor unit.
No Power to Indoor Unit
Symptom
Unit frequently turns on and off (short cycling) without maintaining a stable room temperature.
Short Cycling / Control Instability
Symptom
Unit runs in heating mode but outdoor unit becomes heavily iced over and heating performance drops.
Defrost System Inefficiency
Symptom
Unit trips the circuit breaker shortly after starting.
Overcurrent / Electrical Short
Symptom
Water dripping from the front of the indoor unit or down the wall during cooling.
Indoor Unit Water Leakage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CF |
Unit displays CF after extended operation; cooling may still work but airflow is reduced.
|
Filter Cleaning Reminder | View Details |
| E0 |
Indoor unit will not respond to remote, display shows E0 and unit does not start cooling or heating.
|
Indoor Unit EEPROM Communication Error | View Details |
| E1 |
Indoor unit stops shortly after starting, display shows E1 and unit will not run continuously.
|
Indoor–Outdoor Communication Failure | View Details |
| E2 |
Unit stops cooling and displays E2; indoor fan may continue to run but compressor stops.
|
Indoor Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Outdoor unit stops, indoor unit shows E3; system may start then quickly shut down.
|
Outdoor Coil Temperature Sensor Fault | View Details |
| E4 |
Unit stops and displays E4; may occur after running for some time, especially in cooling mode.
|
High-Pressure Protection / Overload Protection | View Details |
| E5 |
Unit attempts to start but quickly stops and displays E5; sometimes accompanied by humming from outdoor unit.
|
Compressor Overcurrent / Overload Protection | View Details |
| E6 |
Indoor unit shows E6 and stops; may occur during defrost or mode change on heat pump models.
|
Indoor Fan Motor Fault / Feedback Error | View Details |
| E7 |
Unit displays E7 and will not start compressor; sometimes occurs after installation or wiring changes.
|
Outdoor Fan Motor Fault / Feedback Error | View Details |
| E8 |
Unit stops and displays E8; may be accompanied by reduced airflow and ice on indoor coil.
|
Indoor Coil Freeze Protection / Low Evaporator Temperature | View Details |
| E9 |
Unit shows E9 and may shut down unexpectedly; sometimes associated with water leakage from indoor unit.
|
Full Condensate Pan / Drainage Fault | View Details |
| EC |
Unit shows EC and stops cooling; may restart and then show EC again.
|
Refrigerant Leak Detection / Low Refrigerant Protection | View Details |
| F0 |
Unit displays F0 and does not cool effectively; compressor may not start.
|
Refrigerant Undercharge / Low Pressure Protection | View Details |
| F1 |
Indoor unit displays F1 and stops; may occur immediately at startup.
|
Room Air Temperature Sensor Fault | View Details |
| F2 |
Unit shows F2 and may run erratically, overshooting set temperature.
|
Indoor Pipe Temperature Sensor Fault | View Details |
| F3 |
Outdoor unit stops and F3 is displayed; may occur in heating mode on heat pump models.
|
Outdoor Pipe Temperature Sensor Fault | View Details |
| F4 |
Unit displays F4 and does not start compressor; fan may still run.
|
Compressor Discharge Temperature Protection | View Details |
| F5 |
Unit shows F5 and may cycle on and off frequently; performance is poor.
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F6 |
Unit displays F6 and may not respond correctly to remote commands.
|
Indoor PCB–Display Panel Communication Error | View Details |
| H1 |
Display shows H1; unit does not blow warm air for several minutes in heating mode.
|
Defrost Mode Active (Information Code) | View Details |
| H3 |
Unit stops and displays H3; may occur during heavy load in cooling or heating.
|
Compressor Overload Protection (Thermal Trip) | View Details |
| H5 |
Unit displays H5 and will not start compressor; fans may still operate.
|
IPM / Inverter Module Protection | View Details |
| P0 |
Unit shows P0 and may not start or may run at reduced capacity.
|
DC Bus Voltage Protection / Power Supply Fault | View Details |
| P1 |
Portable or window-type Tristar air conditioner displays P1 and stops cooling; water tank icon may flash.
|
Full Condensate Tank / Water Level Protection | View Details |
| P2 |
Portable Tristar unit shows P2 and stops; may occur in dehumidify mode.
|
Secondary Water Level Protection / High-Level Alarm | View Details |
| – |
Air conditioner runs but does not cool the room effectively; supply air feels only slightly cooler than room air.
|
Insufficient Cooling Capacity / Performance Degradation | View Details |
| – |
Burning or electrical smell from indoor or outdoor unit during operation.
|
Overheating Electrical Component | View Details |
| – |
Indoor unit has power but will not start cooling when commanded; display and fan may work.
|
Compressor Not Starting | View Details |
| – |
Indoor unit makes loud rattling or clicking noises when the fan is running.
|
Indoor Fan Noise / Foreign Object in Blower | View Details |
| – |
Outdoor unit is very noisy during operation; rattling, buzzing, or grinding sounds are heard.
|
Outdoor Mechanical Noise / Vibration | View Details |
| – |
Remote control does not operate the Tristar air conditioner; unit can still be controlled from the panel (if present).
|
Remote Control / IR Receiver Failure | View Details |
| – |
Strong musty or moldy smell from the indoor unit when it starts.
|
Biological Growth on Evaporator and Drain Pan | View Details |
| – |
Unit blows air but airflow is very weak even at high fan speed.
|
Restricted Airflow / Fan Performance Loss | View Details |
| – |
Unit displays correct temperature but actual room temperature is much higher or lower than setpoint.
|
Temperature Sensing / Calibration Error | View Details |
| – |
Unit does not turn on at all; no lights or display on indoor unit.
|
No Power to Indoor Unit | View Details |
| – |
Unit frequently turns on and off (short cycling) without maintaining a stable room temperature.
|
Short Cycling / Control Instability | View Details |
| – |
Unit runs in heating mode but outdoor unit becomes heavily iced over and heating performance drops.
|
Defrost System Inefficiency | View Details |
| – |
Unit trips the circuit breaker shortly after starting.
|
Overcurrent / Electrical Short | View Details |
| – |
Water dripping from the front of the indoor unit or down the wall during cooling.
|
Indoor Unit Water Leakage | View Details |
No matching codes found
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