27 Kentatsu air conditioner error codes + troubleshooting

Kentatsu has been in the air conditioner manufacturing market for a very long time now. It is a Japanese company known for its reliability and high quality. Back in the 2000s, they were known for their typewriters and nothing has changed since then except that the categories of products they manufacture have enlarged. They facilitate their customers by adding many advanced and helpful features and self-diagnosis is one of those.

This feature detects any issues occurring in the system and will display you a specific error code indicating that very problem. All you need is to know the causes and you will be able to resolve the issue in most cases. Keep in mind that some models of Kentatsu air conditioners don’t have this feature, so research this factor before buying one. If you cannot take down the error with the below-mentioned solutions, always seek help from an HVAC engineer or a technician to inspect the system and help you out.

Kentatsu AC Error Codes for Series KSFU70XFAN1, KSRU70HFAN1, KSFU120XFAN3 and KSRU120HFAN3

Kentatsu air conditioner error code E1

Causes:

This error is triggered on the AC unit when/if:

• The internal temperature sensor T1 of the unit is malfunctioning.
• The sensor is bent or displaced from its actual position.
• The sensor has been torn off or closed.
• The internal temperature sensor T1 has a short circuit.

Solutions:

1. Check the resistance coefficient of the sensor and if it is less than required. Replace it with a compatible and strong one.
2. Check the wiring between the sensor and the main PCB for any damages. Repair wiring and connectors where needed.
3. Replace the sensor if it is closed, torn off, or has a short circuit.

Kentatsu air conditioner error code E2

Causes:

This error is triggered on the AC unit when/if:

• The evaporator temperature sensor T2 of the unit is not functioning.
• The sensor is bent or displaced from its actual position.
• The sensor has been torn off, disconnected, or closed.
• The evaporator temperature sensor T2 has a short circuit.

Solutions:

1. Try the exact solutions as suggested for the Kentatsu air conditioner “Error Code E1”.

Kentatsu air conditioner error code E3

Causes:

This error is triggered on the AC unit when/if:

• The temperature sensor capacitor T3 of the unit is not operating.
• The sensor is bent or displaced from its actual position.
• The sensor has been torn off, broken, or closed.
• The temperature sensor capacitor T3 has a short circuit.

Solutions:

1. Try the exact solutions as suggested for the Kentatsu air conditioner “Error Code E1”.

Kentatsu air conditioner error code E4

Causes:

This error is triggered on the AC unit when/if:

• The outdoor temperature sensor closed T4 of the unit is not working.
• The sensor is bent or displaced from its actual position.
• The sensor has been torn or closed.
• The outdoor temperature sensor closed T4 has an open or short circuit.

Solutions:

1. Try the exact solutions as suggested for the Kentatsu air conditioner “Error Code E1”.

Kentatsu air conditioner error code E5

Causes:

This error is triggered on the AC unit when/if:

• The communication path between the indoor and outdoor units of the system is damaged.
• The communication wire between the two units is broken.
• The main PCB or the indoor or outdoor unit is faulty.

Solutions:

1. Restart the AC system after keeping it OFF for 1-3 minutes.
2. Verify that the communication wire between the indoor and outdoor units is in good shape. Repair or replace the wire if damaged. 
3. Inspect the wiring and connections between the main PCB and the communication signal receiver for any issues. Repair the wiring and connections if loose or broken.
4. Contact a local technician to check the main PCBs of both units for any malfunctions. Replace either of the PCBs if defective.

Kentatsu air conditioner error code E6

Causes:

This error is triggered on the AC unit when/if:

• The external unit protection is ON.
• The external unit has some component malfunction.

Solutions:

1. Restart the air conditioner after keeping it OFF for 5-15 minutes.
2. If the error persists, call company customer support for guidance or contact an HVAC engineer to inspect the external unit and make necessary repairs.

Kentatsu air conditioner error code E10

Causes:

This error is triggered on the AC unit when/if:

• The system has some compressor suction pressure issues.
• The suction temperature sensor of the outdoor unit needs to be fixed.
• The outdoor unit suction or defrosting temperature sensor has an open or short circuit.
• The refrigerant level in the system is low.
• The outdoor unit is malfunctioning.

Solutions:

1. Verify that the outdoor compressor is not tripped.
2. Inspect the suction temperature sensor for any faults. Replace the sensor if needed.
3. Check the refrigerant level; if it is low, call an HVAC professional for a refill.
4. If still getting the error, contact a local technician to inspect the outdoor unit for any faulty components. Repair or replace the components as needed.

Kentatsu air conditioner error code E13

Causes:

This error is triggered on the AC unit when/if:

• There are some issues related to the compressor phases.

Solutions:

1. Ensure the compressor phase is fine and interconnected in the directed sequence.
2. Contact an HVAC engineer to inspect the phases and compressor itself for any issues. Repair or replace the components, terminals, or wiring as needed.
3. Check the power supply for any faults. Repair or replace the supply as preferable.

Kentatsu air conditioner error code E14

Causes:

This error is triggered on the AC unit when/if:

• The phasing sequence of the compressor is incorrect.
• Power supply terminals connecting the 3-phase system are loose or broken.
• The power supply itself is malfunctioning.
• The main PCB of the system is malfunctioning.

Solutions:

1. Call an HVAC engineer to check the 3-phase sequence. If they are incorrectly connected, exchange wires of phases until they are all in the proper sequence.
2. Check the power supply terminals and repair them if they are loose or broken. Make sure terminals are connected to their designated locations.
3. Inspect the AC unit power supply for any faults. Repair or replace the power supply as preferable.
4. If the error persists, inspect the main PCB for any faults. Replace the PCB if defective.

Kentatsu air conditioner error code P4

Causes:

This error is triggered on the AC unit when/if:

• The system is indicating that the evaporator temperature protection is ON.
• The evaporator temperature sensor is malfunctioning, bent, or has a short circuit.

Solutions:

1. Turn OFF the AC unit for 10-15 minutes or until it cools down completely. Restart the unit and see if the error is resolved.
2. Check the evaporator temperature sensor and if it is bent or displaced, move it back to its original position.
3. Look through the wiring between the sensor, evaporator, and main PCB for any damage. Repair the wires and connections where damaged.
4. Check the sensor for any malfunction. Replace the sensor if it is faulty.
5. Check the main PCB and replace it if it is faulty.
6. If the error persists, contact a technician to inspect the evaporator for any faults. Repair or replace the components as needed.

Kentatsu air conditioner error code P5

Causes:

This error is triggered on the AC unit when/if:

• The unit is indicating condenser temperature protection.
• The wiring and connections are loose or broken. 
• The system condenser is faulty.

Solutions:

1. Check the wiring and connections between the condenser, condenser temperature sensor, power supply, and main PCB. Repair the harness if loose or broken.
2. Check the condenser temperature sensor for any malfunction. Replace the sensor if it is faulty or has a short circuit.
3. Check the main PCB for any interruption. Replace The PCB board if it is malfunctioning.
4. If the error persists, contact an HVAC engineer to check the condenser for any faults. Repair or replace the condenser as needed.

Kentatsu air conditioner error code P7

Causes:

This error is triggered on the AC unit when/if:

• The discharge temperature of the system is too high.
• The compressor protection is in operation.
• The discharge temperature sensor is faulty.

Solutions:

1. Restart the AC unit after keeping it OFF for 15-30 minutes to let it cool down.
2. Using a meter, check the voltages to the compressor and ensure they are consistent and not fluctuating.
3. If the sensor is the actual problem, try the exact solutions as suggested for the Kentatsu air conditioner “Error Code E1”.
4. Check the main PCB for any malfunctioning and replace the board if that’s the case.
5. If the error persists, contact a local technician to inspect the compressor and if it is faulty, repair or replace it as needed.

Kentatsu air conditioner error code P9

Causes:

This error is triggered on the AC unit when/if:

• The outside temperature is getting too low.

Solutions:

This is not an error but a message that the outside temperature is going below the normal limit.

1. In most cases, the error will be resolved once the temperature comes back to its normal range.
2. If the error persists, contact an HVAC professional to inspect the system and suggest a suitable solution.

Kentatsu air conditioner error code P10

Causes:

This error is triggered on the AC unit when/if:

• The output or discharge pressure protection is ON.
• The wiring and connections of the compressor pressure switch are loose or broken.

Solutions:

1. Turn OFF the air conditioner and then restart it after a few seconds.

If the error is still on the system’s display, contact an HVAC engineer or a technician to:

• Check the pressure level of the compressor using a pressure meter or gauge and bring it back to a normal range.
• Check the stop valve for any clogging or breakages. Clean, repair, or replace the valve as needed.
• Verify that all wiring and connections are in shape and properly connected.

Kentatsu air conditioner error code P11

Causes:

This error is triggered on the AC unit when/if:

• The suction pressure protection is ON.
• The suction pressure has some issues.
• The compressor is malfunctioning.

Solutions:

1. Try the exact solutions as suggested for the Kentatsu air conditioner “Error Code E10”.
2. Contact a technical or an HVAC professional; to inspect the system if necessary.

Kentatsu air conditioner error code P12

Causes:

This error is triggered on the AC unit when/if:

• The overcurrent protection is ON in the AC system.
• Inconsistent or high voltages are being supplied to the system.
• The power cord is damaged.

Solutions:

1. Restart the AC unit after keeping it OFF for 1-3 minutes.
2. Verify that power is properly connected to wall receptors and not damaged. Repair or replace the cord if broken.
3. Using a meter, check voltages and ensure they are not fluctuating.
4. If the error persists, contact a technician or an electrician to inspect the electrical components of the system. Perform repairing or replacing as needed.

Kentatsu air conditioner error code HS

Causes:

This error is triggered on the AC unit when/if:

• The system is under the defrosting process.

Solutions:

1. In most cases, the error will be taken down once the defrost process has been completed.
2. Clean the condenser coils, evaporator, and air filters to remove dust and debris buildup.

Kentatsu AC Error Codes for Series KSGH/KSRH21CFDN1, KSGH/KSRH35CFDN1, KSGH/KSRH21HFDN1 and KSGH/KSRH35HFDN1

Kentatsu air conditioner error code E1

Causes:

This error is triggered on the AC unit when/if:

• EEPROM (Non-Volatile Memory) on the control board has issues.
• The EEPROM is erased and doesn’t have any instructions now.
• The system is unable to read the chip.  
• The EEPROM memory chip is damaged.

Solutions:

1. Restart the AC unit after shutting it down for 5-15 seconds.
2. Check the EEPROM chip and if it is broken or burnt, replace the whole control board.
3. Contact the company customer support or official engineer to check the EEPROM and ensure that the instructions are there. Upload the instructions if the chip is empty.

Always prefer a company’s official engineer for reprogramming the chip as they have better access to the backend and have compatible programs for your specific system model as well.

Kentatsu air conditioner error code E2

Causes:

This error is triggered on the AC unit when/if:

• When the AC unit detects a zero-crossing signal detection glitch/error.
• The power supply is faulty.
• The main PCB is malfunctioning.

Solutions:

1. Turn OFF the AC system, unplug the power cord, turn OFF the breakers, keep it shut down for 3-5 minutes, and then turn it back ON.
2. Check the wiring and connection between the main PCB, control board, and power supply for any breakages. Do repairs where needed.
3. Check the main PCB for any malfunction. Replace The PCB if it is faulty.
4. If the error is still there, check the power supply for any interruptions. Repair or replace the component as preferable.

Kentatsu air conditioner error code E3

Causes:

This error is triggered on the AC unit when/if:

• The fan speed is fluctuating.
• The fan motor has stopped working.

Solutions:

1. Turn OFF the AC unit and then turn it ON after a few seconds.
2. Move the fan manually to see if there is something stuck or causing an interruption. Remove it from the fan blades. 
3. Using a meter, check voltages and ensure a consistent supply.
4. Check the wiring and connection between the fan motor, power supply, and PCB. Repair the wiring and connection if damaged or loose.
5. Inspect the fan motor for any faults and replace it if needed.
6. Check the main PCB as it may be faulty and need replacement.

Kentatsu air conditioner error code E4

Causes:

This error is triggered on the AC unit when/if:

• The compressor current protection has been activated 4 times in a specific period.

Solutions:

1. Restart the air conditioner after keeping it OFF for 5-15 minutes.
2. Contact an HVAC engineer to inspect the compressor as it may be faulty or have loose wiring and connections. Repair or replace damaged elements as needed.

Kentatsu air conditioner error code E5

Causes:

This error is triggered on the AC unit when/if:

• The temperature sensor for the indoor unit is malfunctioning.
• The indoor temperature sensor is bent, torn, closed, or disconnected.
• The sensor has a short circuit.

Solutions:

1. Try the exact solutions as suggested for any other sensor fault in the Kentatsu air conditioner such as “Error Code E1” of the first series.

Kentatsu AC Error Codes for Series KSFU/KSRU76HFDN3 and KSFU/KSRU140HFDN3

Kentatsu air conditioner error code P4

Causes:

This error is triggered on the AC unit when/if:

• The indoor unit thermal protection of the evaporator has been activated.
• The evaporator is faulty.
• Main PCB is malfunctioning.

Solutions:

1. Turn OFF the system and restart it once it has cooled.
2. Remove dust from the evaporator and ensure proper airflow to the system.
3. Check the voltages and ensure a consistent and required level of supply.
4. Replace the main PCB if it is at fault.
5. Inspect the evaporator and if it is defective, repair or replace it as preferable.

Contact the company representative or an experienced technician for further assistance.

Kentatsu air conditioner error code P5

Causes:

This error is triggered on the AC unit when/if:

• Outdoor unit thermal protection of the capacitor has been activated.
• Inconsistent voltages are supplied to the system.
• The capacitor is faulty.

Solutions:

1. Turn OFF the system, unplug the power cord, and restart it after a rest of 5-25 minutes.
2. Ensure a consistent supply of voltages to the system.
3. Check the capacity level of the capacitor and if it is weak, burnt, or broken, replace the capacitor with a new one.

Contact the company representative or an experienced technician for further assistance.

Kentatsu air conditioner error code P9

Causes:

This error is triggered on the AC unit when/if:

• The defrost process has been started in the system.
• The comfort airflow protection has been turned ON.

Solutions:

1. In most cases, the defrost error will be taken down automatically by the system once the process has been completed.
2. If the error persists or occurs very often. Do a thorough general cleaning of the system to remove dust and debris build-up, clogging, or restrictions.
3. Check the comfort airflow sensor for any faults. Replace the sensor if it is malfunctioning.
4. Contact customer support for guidance or an HVAC engineer to inspect the system and suggest and implement repairs as needed.

Kentatsu Air Conditioners Channel Type KSKT-HF Error Codes

Kentatsu air conditioner error code E4

Causes:

This error is triggered on the AC unit when/if:

• The drainage pump temperature sensor is not functioning correctly.
• The sensor has an open or short circuit.
• The sensor is bent, broken, closed, or torn.

Solutions:

1. Try the exact solutions as suggested for any other sensor fault in the Kentatsu air conditioner such as “Error Code E1” of the first series.

Kentatsu air conditioner error code E6

Causes:

This error is triggered on the AC unit when/if:

• When the water level is rising in the tray, pan, or tank under the condenser.
• The water overflow switch is faulty.

Solutions:

1. Check the condensation water tray and if it is full, remove the water and put it back into the system.
2. Ensure that all valves and paths are fully opened and have no clogging or restrictions.
3. Inspect the water overflow switch and if it is faulty, replace it.