This site is not affiliated with Blue Star; this is an independent explanation.
One warning before you read the Blue Star AC error code list: the same code can mean slightly different faults on different models. When your Blue Star split or inverter AC shows E1, E2, E6 or another short code, the control board has detected a reading or a signal that is out of its normal range and has stopped or limited the AC to protect it.
This page gives the common meaning on most models, the simple checks that are safe for you, and the point where a trained technician must take over. For a deeper look at one popular code, see the page on Blue Star E6. Always confirm the final meaning in your manual or with Blue Star authorised service, using the model name printed on the indoor unit.
Common causes
1Dirty filter and coil causing wrong readings
How to tellAC cools poorly, ice forms, code shows after weeks of heavy use
What fixes itRinse the filters, let them air dry, and wait for any ice to thaw before restarting
2Power cut or voltage fluctuation
How to tellCode appears right after the supply returns or in the evening peak
What fixes itDrop the AC breaker for a short rest, then start it again
3Room or coil sensor drifting or failing
How to tellE1 or E2 style code, early shut off or compressor that never rests
What fixes itSensor test and replacement by a technician
4Indoor and outdoor units not talking
How to tellE6 style code, indoor fan runs while the outdoor unit stays silent
What fixes itConfirm the outdoor feed is on; wiring and boards need a technician
5Fan motor or capacitor trouble
How to tellFan hums, spins slowly or stops, with a protection code
What fixes itTechnician checks the motor and capacitor
6Compressor or high current protection
How to tellAC trips again and again a minute after the outdoor unit starts
What fixes itStop restarting and book authorised service
7Low gas or a leak
How to tellWeak cooling, frost on the pipe and a protection code together
What fixes itLeak search and refill are for trained technicians only
How to fix it, step by step
Record the code and the AC behaviour
Snap a picture of the display, or count how many times the lamp blinks. Note if the fan runs, if cool air comes at all, and if the outdoor fan is turning. This helps service staff to match your model.
Cut the power for a short rest
Stop the AC from the remote, then flip its breaker down. Count to three hundred, flip it up and choose Cool. A stray code caused by a supply dip will often vanish.
Wash both washable filters
Raise the grille, pull the two filters and rinse them in a bucket of plain water, then leave them out of the sun until dry. Choked filters are the commonest hidden cause of sensor and freeze codes.
See that the outdoor feed is switched on
Look at the switch or breaker that feeds the outdoor unit and make sure it is on. Do not touch any wires. A tripped switch looks like a communication fault.
Run the fan only if you see ice
If the pipe or indoor coil is frosted, switch to fan mode for an hour so the ice melts. Wipe the water that has collected. Then try Cool again with a higher set temperature, such as 24 degrees.
Try the remote and set temperature once
Change the batteries, point the remote straight at the unit and try again. If the code is the same, it is not the remote.
Stop here and call Blue Star authorised service
If the code returns after your reset, stop using the AC. Give the technician the model, the code and the time it appears. In the meantime, the cooling checklist rules out simple causes.
Blue Star AC error code list: common codes
| Code | Usual meaning on most models | Safe first move |
|---|---|---|
| E1 | Room temperature sensor fault | Power reset, then technician |
| E2 | Indoor coil sensor fault | Clean filter, then technician |
| E6 | Indoor to outdoor communication fault | Check outdoor power, then technician |
Other codes you will meet, such as the blue star e3 error code, the blue star ac e5 error code, F1, H3, H6 or PH, are not the same on every series of Blue Star ACs. Window ACs, fixed speed splits and inverter splits can use different tables. Do not guess: open the code page of your own manual, or ask service to confirm against the serial number.
Window, split and inverter models read codes differently
Window ACs often have only a few lamp patterns, while splits show text on the indoor display. Inverter models add checks for the compressor drive and the outdoor board, which is why they can have more codes. If your search says 'blue star inverter ac error code', do not reuse a code table from a window model.
The display shows E2 and the AC stops cooling after twenty minutes, even though the fan keeps spinning. After washing the filter nothing changes. That points to the coil sensor reading, so ask the technician to test it rather than replace the board.
How to tell a simple fix from a service call
You can handle: dirty filters, a tripped breaker, a dead remote battery, a blocked airflow and a power reset. A technician must handle: sensors, boards, motors, capacitors, compressors, gas and all wiring. The code alone does not prove which part is bad, so a good technician measures before replacing.
Leave the casing of the outdoor unit shut, keep your hands off the boards, and do not add gas or short out a sensor. Each of these is risky, may end your warranty and can hide the real fault.
What decides the repair cost
Changing a sensor or a capacitor is the light end of the bill, a fan motor or board sits in the middle, and compressor or leak work is the heavy end. Warranty cover, the AC's age and how high the outdoor unit sits also change the bill. Ask for the part name, whether it is covered, and a written estimate.
Keeping the codes away
Book the yearly service ahead of summer, keep washing the filters, and give the AC a steady supply. If your voltage swings, an electrician can check it. For other brands, see the AC error codes guide for all brands, or open the page on Blue Star F2 for another common display.
Frequently asked questions
E1 on my Blue Star AC: which part is it pointing at?
On most models E1 points to the room temperature sensor. The AC cannot read the room, so it may cool badly or stop. Reset the power once and call service if it returns.
What is the E2 error in a Blue Star AC?
E2 is commonly the indoor coil sensor. A dirty coil or filter can make it show up, so clean the filters, and if it stays, a technician should test the sensor.
How do I fix the E6 error code in a Blue Star AC?
E6 usually means the two halves of the AC are not communicating. Confirm the outdoor power is on, reset the breaker and call authorised service for wiring and board checks.
Can I get a Blue Star inverter AC error code list for every model?
A single list for all models does not exist, because tables change by series. Your manual, or the authorised centre, holds the exact list for your model number.
Should I carry on using the AC while a code is on the display?
If it cools normally and the code was a one time display, yes. If it repeats, stop. Running a protected AC can damage the compressor and raise the repair cost.