Bluestar AC Error Codes List and Fixes

Generally, Bluestar ACs perform well. Besides, Bluestar offers warranties on the compressor and PCB for extended periods. Furthermore, all their products come with a one-year product warranty. However, the Bluestar AC is a machine, and it can fail. Under such circumstances, we advise users to lodge an official complaint and summon the authorized Bluestar technician.

Bluestar technician vs General AC mechanic

Generally, AC mechanics can handle almost all AC operational problems. However, it is still advisable to call the authorized Bluestar AC technician to address issues with Bluestar ACs. These authorized technicians are trained well to service ACs. They know each problem and its solution.

Bluestar ACs come equipped with a self-diagnosis system that can diagnose almost all problems associated with air conditioners. The system indicates the faults through error codes on the IDU, ODU, and the remote controller unit. These error codes vary from one AC series to the other. However, the primary error codes remain the same. We shall now discuss the various error codes on Bluestar ACs, their causes, and fixes.

Users are advised not to try fixing any problem with the Bluestar AC. Instead, they should note the error code and seek professional assistance. However, users can clean the AC filters fortnightly by removing them from their sockets.

Bluestar AC Error Codes

Window AC – L Series

E1 – Room Sensor Failure

The room sensor can malfunction because of a faulty PCB, or there could be a loose connection somewhere. The AC technician should investigate properly, reconnect the sensor wire, or replace it if damaged. PCB damage should be dealt with accordingly.

E2 – Evaporator coil sensor failure

There could be a disconnection or malfunction of the evaporator coil sensor. Under such circumstances, the Bluestar AC flashes the E2 error code. The solution is to reconnect or replace the sensor.

Window AC – G – Series

E1 – Room sensor failure

Replacing or reconnecting the sensor can rectify the issue.

E2 – Evaporator coil sensor failure

The solution is to replace or reconnect the evaporator coil sensor.

Window AC – Y, R, and M Series

Er – Indoor ambient temperature sensor failure

Excessive heat inside the AC unit can melt the sensor terminals and cause them to disconnect. The solution is to reconnect or replace the sensor.

En – Evaporator pipe temperature sensor failure

Abnormal changes in the temperature levels can cause the sensor to fail. The solution is treating the root of the problem. It can be replacing the PCB or refilling the refrigerant. The sensor might also require replacement or reconnection.

Eo – Condenser pipe temperature sensor failure

Unusual changes in temperature levels can cause the condenser pipe temperature sensor to malfunction. The solution is to check the gas levels and refill them. The PCB also needs checking and repair for faults. Replacing the sensor is essential if damaged.

Ed – Evaporator defrosting defect

Insufficient airflow can cause the evaporator defrosting defect. It can be because of a blocked filter, low fan speeds, or a dirty evaporator coil. Usually, shutting off the unit can resolve the problem. Then, you can investigate the reasons. Clean the filters if clogged. Otherwise, the AC technician is the right person to repair the fan speed and handle other technical issues.  

Split AC – Star Rated – Specific models 3-star VA, VB, VC, VD, 2-star OA, OB, OC, 5-star ZA, ZB, ZC, ZD, 5-star SA-SB, SAF-ZAF, 3HS18TAT

F1 – Indoor ambient temperature sensor open/short-circuited

The solution is to check the sensor for loose connections or short circuits. You might have to replace or reconnect the sensor to resolve the issue.

F2 – Indoor evaporator temperature sensor open or short-circuited

Abnormal temperature fluctuations can cause short-circuit of the evaporator temperature sensor. Check for loose connections. Replace the sensor or reconnect it to solve the problem.

H6 – PG Motor (Indoor fan motor) does not operate.

Check the connections with the PCB. Solder the wires if they are loose. There can be a capacitor error. Replace the capacitor to resolve the fan motor issue. An open winding can also cause this problem. Tighten the winding and set the matter right.

C5 – Malfunction protection of jumper cap

Check whether the pins have been fixed correctly. For example, installing the jumper cap in the wrong pin can cause its malfunction. Remove the cap and fix it again correctly. If the problem persists, replace the cap.

U8 – PG motor (indoor fan) circuit malfunction by zero cross detection

The U8 error is because of a fault in the indoor fan Pulse Generator circuit due to zero cross detection. The technician checks the circuit and fixes it properly.

E5 – Overcurrent protection

Bluestar ACs come equipped with circuit breakers that snap when excessive current flow occurs. Replacing the fuse and resetting the circuit breaker should resolve the problem. However, if the problem recurs frequently, you must check the power supply and fix the overcurrent problem.

Split AC – Specific Series 2-star RA-RB, 3-star TA-TB, 5-star DA-DB, 3-star FA-FB-FC

E1 – EEPROM error

The EEPROM error is a software problem that can be rectified by the authorized AC technician alone.

E2 – Zero crossing error

Summon the technician to rectify the circuit and resolve the zero crossing error.

E3 – Indoor fan speed out of control

A faulty capacitor can cause the indoor fan to revolve at uncontrollable speeds. Replace the capacitor to resolve the issue.

E4 – Overcurrent protection of the compressor – 4 times

This error signifies excessive current flow to the compressor, repeatedly tripping the circuit breaker. Replace the wiring and check the input current flow. Users should not restore the circuit breaker setting without ascertaining the collateral damage. It can lead to compressor failure.

E5 – Open/Short-circuit of room temperature sensor

Replacing or reconnecting the room temperature sensor can resolve the issue.

E6 – Open/Short-circuit evaporator temperature sensor

Reconnect the sensor or replace it if it is damaged.

The following error codes pertain to 3-star FA-FB-FC alone.

E7 – Condenser coil temperature sensor open/short-circuited

The solution is to replace the sensor or reconnect it.

EC – Refrigerant leakage detection

The AC technician checks for leakages in the pipes and replaces them accordingly. Rusted pipes need replacement. Finally, refilling the gas is essential.

E9 – Indoor and Outdoor unit communication error

Check for the reason for miscommunication. Replace the wiring if snapped. Re-install the AC if there is a plumbing issue.

Split AC – Model Series, including Old star-rated and non-star rated appliances, DC Inverter C-Series, S-Series,

E1 – System high-pressure protection

Replace or reset the high-pressure protection switch.

E2 – Inner anti-frozen protection

Switching the AC off can resolve the problem. Restart the AC. If the problem persists, summon the AC technician.

E3 – System low-pressure protection

The solution is to replace or reset the low-pressure protection switch.

E4 – Compressor discharge pressure issue

The presence of air in the system can cause compressor discharge pressure issues. Similarly, clogged condensers can be a reason. Again, the solution is to recharge the system and remove the debris from the condenser. But, again, the AC technician is the right person to deal with the issue.

E5 – Low voltage overcurrent protection, Overload protection in S-Series ACs

Reset the tripped circuit breaker. If the low voltage or overcurrent issue persists, you can connect an external voltage stabilizer.

E6 – Communication failure

Check the wiring and plumbing for errors. Then, replace the defective pipes and damaged wires to resolve the issue.

E7 – Mode conflict

Check whether the IDU and ODU are compatible. Otherwise, change the units.

E8 – Anti-high-temperature protection issue

The temperature can increase because of reduced refrigerant flow. Check refrigerant levels and reset the circuit breaker.

E9 – Anti-cold wind protection

Excessive refrigerant can result in abnormally high-cooling and snapping of the circuit breaker. Check refrigerant pressure levels and reset the circuit breaker.

E0 – Low running frequency due to low voltage supply

Check input voltage and install an external voltage stabilizer, if necessary.

F1 –  Indoor ambient temperature sensor is open/short-circuited.

Replace or reconnect the sensor to resolve the problem.

F2 – Indoor evaporator temperature sensor is open/short-circuited.

The solution is to reconnect or replace the sensor.

F3 – Outdoor ambient temperature sensor is open/short-circuited.

Sensor reconnection or replacement is the perfect solution.

F4 – Outdoor condenser temperature sensor is open/short/circuited.

Reconnect or replace the sensor to resolve the issue.

F5 – Outdoor discharge temperature open/short-circuited.

Check the wiring and replace the fuse. Reconnect or replace the sensor if damaged.

F6 – Lower running frequency because of cooling overload.

The problem could be with the blower motor. Replacing the capacitor or repairing the blower motor can resolve the issue.

F7 – Oil return in cooling mode

Check and replace the oil return valve to resolve the issue.

F8 – Lower running frequency because of overcurrent

Check the power supply for excessive current. Replace the wiring if necessary.

F9 – Lower running frequency due to discharge pressure too high

Reduce the discharge pressure to resolve the issue.

H1 – Defrost error

Switch off the AC and restart it after some time. The error should vanish.

H2 – Static dust removing protection

Clean the AC filters and remove dust to improve their performance.

H3 – Compressor overload protection

Check for compressor faults. Usually, the compressor is under warranty. However, users should not reset the circuit breaker before investigating other issues.

H4 – Abnormal system

The H4 error code requires a thorough investigation. It can be abnormal fan speed. Maybe, the compressor might need replacement.

H5 – Module protection

This error can happen because of system overload. Hence, it requires thorough checking by the AC mechanic.

H7 – Synchronization failure

The AC technician checks the IDU and ODU for compatibility and restores the synchronization.

H8 – Water full protection

Usually, you observe the H8 error on a portable AC. It indicates that the water tray is full. So, emptying the water tray should resolve the problem.

H9 – Electric heater malfunction

Repairing or replacing the heating coil can resolve the issue.

H0 – Lower frequency for anti-high temperature in heating mode

This error H0 is observed in ACs that have a heating function.

C-Series ACs, S-Series ACs

U8 – Circuit PG motor circuit malfunction by zero cross detection

U8 error is a PG circuit fault that requires professional attention.

H6 – No response from the indoor motor

There could be a misconnection between the PCB and the indoor motor. Check the wiring and circuits for disconnections.

C5 – Malfunction protection of jumper cap

Place the cap on the pins correctly. Replace the cap if defective.

PH – Voltage for DC bus bar too high, DC generatrix voltage high (S-Series)

The PH error is an over-voltage error. You can use an external voltage stabilizer to rectify the issue.

U5 – Malfunction of complete unit current detection

This error occurs when the AC unit does not start after installation. Check the installation procedure for mistakes and set them right accordingly.

P5 – Overcurrent protection of phase current for compressor

Check the input current and replace the wiring if found excessive. Please do not reset the circuit breaker without investigating other problems. 

HC – PFC protection

Excess current flow can cause PFC (Power Factor Correction) issue in Bluestar ACs. Replacing the wiring and resetting the circuit breaker should resolve the issue.

LC – Failure to start

Check all the circuits properly and restart the appliance.

U1 – Malfunction of phase current detection circuit for the compressor

Try changing the current phase and restarting the machine.

EE – EEPROM error

The EEPROM error is a software malfunction that needs professional attention.

PU – Charging malfunction of capacitor

Changing the capacitor should resolve the problem. However, the issue requires professional attention.

P7- Malfunction of module temperature sensor circuit, IPM error

Replacing or reconnecting the sensor should be the ideal solution. However, if the problem persists, it could be a problem related to refrigerant flow.

P8 – Module high-temperature protection

Refrigerant issues can cause high-temperature protection faults. Therefore, the technician should investigate before resetting the circuit breakers.

U3 – Malfunction of voltage dropping for DC bus bar

The U3 error code is because of the voltage drop for the DC inverter. Check the input voltage and use a voltage stabilizer, if required.

PL – Voltage of DC bus bar too low

Check for input voltage fluctuations and take remedial action.

EU – Limit/decrease frequency due to high temperature of the module

High temperature can be because of a refrigerant issue. Check the gas levels and act accordingly.

U7 – Abnormal 4-way valve

Replace the abnormal 4-way valve and resolve the issue.

U9 – Zero-crossing malfunction of the outdoor unit

Resolve the zero-crossing malfunction of the ODU.

FH – Limit/decrease frequency due to anti-freezing

The problem lies in the abnormal functioning of the fan motor. Check the fan motor and replace the capacitor if faulty.

L3 – Fan module protection (S-Series)

Check the fan motor for abnormalities and repair them accordingly.

Split AC – Star Rated – Specific models

FA – Lower running frequency due to high pipe temperature

The high temperature is usually because of refrigerant issues. Check the gas levels and act accordingly.

FH – Lower running frequency due to anti-freeze

The FH error code is a fan motor problem. Resolve the issue before restarting the AC.

Split AC – Model 3-star JA, JB, J3

F1 – Room temperature sensor error

Reconnect or replace the temperature sensor.

F2 – Pipe temperature sensor error

Reconnect or replace the pipe temperature sensor.

F4 – PG Motor error

Check the Pulse Generator motor for abnormalities and resolve the issue.

Split AC – 2-Star NA, NB, NM3, 3-star HAF

E1 – Temperature sensor of air intake abnormity

Reconnect and replace the temperature sensor if found faulty.

E2 – Temperature sensor of outdoor unit coil abnormity

The sensor could have come loose or become faulty. Reconnect the sensor and replace it if defective.

E3 – Temperature sensor of indoor unit coil abnormity

Replacing the temperature sensor can resolve the issue.

E4 – PG Motor of indoor unit feedback abnormity  

Repair the motor and resolve the abnormity.

Final Thoughts

Bluestar AC technicians are trained professionally to deliver the best services to consumers. Hence, we recommend lodging official complaints online and summoning the service personnel if there are problems with the Bluestar AC.

Gaurav Arvind
Gaurav Arvind
I am a software engineer by profession but blogger by passion. I have been doing blogging, reviews and writing about products for the past 3 years. I love what I do. If you can't tell me what it's made of, I won't tell you how good it is !


  1. When we start the Ac it shows 12 and then CC. But then it functions normally on the temperature it is set. What is the 12 and CC ?

    • Don’t worry it is nothing but fix and lock mechanism in blue star ac ……12 CC…..means ….your ac is running at 1.2 ton cooling capacity ……you can see if you keep pressing fix&lock in ur AC remote ….it changes to 08,10,12,15 nothing but 0.8,1.0,1.2,1.5 ton ….. The ac can be converted according to ur room space etc…… If you don’t wanted the ac to show anything….you set your ac to max. Capacity by pressing “fix&lock” button in ur AC remote…..for e.g. if u bought a 1.5 ton Ac, set it to 15cc ……if it is 2 ton Ac, then 20cc ….

      Hope it helped you 😁👍


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