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Air Conditioner Error Codes India
66 fault codes across 10 brands — step-by-step fixes with safety warnings and tool links.
66
Error codes
10
Brands covered
31 min
Avg. fix time
29%
Beginner-friendly
About air conditioner errors in India
Air conditioner error codes spike during Indian summers (March-June) when AC usage peaks. Voltas leads AC error searches in India, followed by Samsung, LG, and Haier. Common faults include outdoor unit fan failures, refrigerant pressure drops (often misdiagnosed as gas leaks), and sensor errors from dust buildup on the evaporator coil. Split ACs need the outdoor unit cleaned every 3-4 months in dusty Indian cities. Most AC errors require intermediate skill and a basic multimeter — never work on a running outdoor unit.
Common air conditioner fault patterns
not cooling
sensor fault
motor / fan / magnetron fault
not draining / drainage fault
unbalanced load / spin fault
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All air conditioner error codes
Blue Star — Error E6 on a Blue Star split or inverter AC indicates a communication failure between the indoor unit and the outdoor unit — the two boards can no longer 'talk' to each other over the interconnecting signal wire.
25 min · intermediate
Blue Star — Error F2 on a Blue Star split or inverter AC indicates a fault in the indoor coil temperature sensor — the thermistor clipped to the evaporator coil that tells the board how cold the coil is.
30 min · intermediate
Blue Star — Error E1 on a Blue Star split air conditioner signals a fault in the indoor air temperature sensor (thermistor).
30 min · intermediate
Blue Star — Error E2 on a Blue Star split air conditioner indicates a fault in the indoor evaporator coil temperature sensor.
35 min · intermediate
Blue Star — Error E3 on a Blue Star split air conditioner indicates a fault with the outdoor condenser coil temperature sensor.
40 min · intermediate
Blue Star — Error E5 on a Blue Star split air conditioner indicates that the compressor overcurrent protection circuit has tripped.
20 min · intermediate
Blue Star — Error F1 on a Blue Star split air conditioner indicates a fault or corruption in the EEPROM (Electrically Erasable Programmable Read-Only Memory) chip on the indoor unit's PCB.
15 min · beginner
Blue Star — Error F3 on a Blue Star split air conditioner indicates that the outdoor fan motor has failed or is not functioning within acceptable parameters.
25 min · intermediate
Carrier — Error E1 on a Carrier split air conditioner signals a fault with the indoor ambient temperature sensor (thermistor).
30 min · intermediate
Carrier — Error E2 on a Carrier split AC indicates a fault with the indoor evaporator (coil) temperature sensor.
40 min · intermediate
Carrier — Error E4 on a Carrier split air conditioner indicates a fault with the outdoor condenser temperature sensor.
45 min · intermediate
Carrier — Error E5 on a Carrier split AC indicates compressor overcurrent or overload protection has triggered.
20 min · intermediate
Carrier — Error E6 on a Carrier split AC indicates a communication failure between the indoor and outdoor units.
35 min · intermediate
Carrier — Error F1 on a Carrier split AC indicates an EEPROM (Electrically Erasable Programmable Read-Only Memory) fault on the indoor unit PCB.
25 min · intermediate
Daikin — Error A1 on a Daikin AC means the system has detected an internal fault on the indoor unit's main printed circuit board (PCB).
15 min · intermediate
Daikin — Error A3 on a Daikin AC indicates that the condensate drain system has failed — either the drain pump has malfunctioned, the drain pipe is blocked, or the condensate collection tray has overflowed.
30 min · beginner
Daikin — Error A5 on a Daikin AC is a protection trip, not a broken part.
40 min · beginner
Daikin — Error E1 on a Daikin air conditioner indicates a communication failure on the indoor unit's printed circuit board (PCB).
25 min · intermediate
Daikin — Error E5 on a Daikin AC indicates that the compressor's overload protection has activated.
30 min · intermediate
Daikin — Error E7 on a Daikin AC means the indoor unit's fan motor has stopped, stalled, or is not reaching the speed commanded by the PCB.
20 min · intermediate
Daikin — Error H6 on a Daikin inverter AC means the outdoor board has lost position-detection feedback from the inverter compressor — it can no longer sense the rotor's position, so it cannot drive the compressor.
15 min · advanced
Daikin — Error L3 on a Daikin AC indicates that the outdoor unit's electrical box or inverter components have reached a critically high temperature.
35 min · intermediate
Daikin — Error U0 on a Daikin AC indicates the refrigerant pressure in the system has dropped below the safe operating threshold.
10 min · beginner
Daikin — Error U4 on a Daikin AC indicates a communication failure between the indoor and outdoor units.
20 min · intermediate
Daikin — Error UF on a Daikin AC means the system has not finished pairing the indoor and outdoor units correctly — the wiring and refrigerant piping do not match up, or the interconnecting cabling and address setup are wrong, or the refrigerant charge is short.
20 min · intermediate
Haier — Error E1 on a Haier split air conditioner indicates a fault with the indoor unit air temperature sensor.
30 min · intermediate
Haier — Error E2 on a Haier split air conditioner indicates a fault with the indoor evaporator coil temperature sensor.
30 min · intermediate
Haier — Error E5 on a Haier air conditioner indicates voltage protection has tripped: the input AC voltage is outside the safe operating range (typically below 180 V or above 250 V).
30 min · beginner
Haier — Error F1 on a Haier split air conditioner indicates a fault with the indoor unit fan motor.
45 min · intermediate
Haier — Error F2 on a Haier split air conditioner indicates a fault with the outdoor unit fan motor.
45 min · intermediate
Haier — Error F4 on a Haier split air conditioner indicates the compressor overload protection has tripped.
60 min · intermediate
LG — Error C1 on LG air conditioners indicates that the indoor unit room temperature sensor (thermistor) has an open circuit or short circuit.
25 min · beginner
LG — Error C5 on LG air conditioners indicates that the indoor pipe temperature sensor (evaporator thermistor) has an open circuit or short circuit.
30 min · intermediate
LG — Error CH 05 indicates a communication breakdown between the indoor and outdoor units of your LG split air conditioner.
30 min · intermediate
LG — Error CH 10 indicates a fault with the indoor unit fan motor, typically the BLDC (brushless DC) motor used in LG inverter air conditioners.
40 min · intermediate
LG — Error E1 on LG air conditioners indicates that the high-pressure switch has tripped, meaning the refrigerant pressure in the system has exceeded safe operating limits.
35 min · beginner
LG — Error E5 on LG air conditioners indicates an overcurrent protection fault, meaning the compressor is drawing more electrical current than the system's rated limit.
30 min · intermediate
Lloyd — Error E1 on a Lloyd split air conditioner indicates a fault with the indoor unit air temperature sensor.
30 min · intermediate
Lloyd — Error E2 on a Lloyd split air conditioner indicates a fault with the indoor evaporator coil temperature sensor.
30 min · intermediate
Lloyd — Error E3 on Lloyd air conditioners signals a compressor failure or malfunction.
15 min · beginner
Lloyd — Error E4 on a Lloyd split air conditioner points to an outdoor unit temperature sensor fault.
30 min · intermediate
Lloyd — A Lloyd air conditioner that runs but does not cool can have causes ranging from trivial to serious.
40 min · beginner
Panasonic — Error F11 on Panasonic air conditioners indicates a communication failure between the indoor unit and outdoor unit.
25 min · intermediate
Panasonic — Error F91 on Panasonic air conditioners indicates the voltage protection circuit has been activated due to unstable or out-of-range mains voltage.
20 min · beginner
Panasonic — Error F95 on Panasonic air conditioners signals a compressor failure or malfunction detected by the unit's protection circuit.
15 min · beginner
Samsung — Error C5 on a Samsung split air conditioner indicates a communication failure between the indoor unit and the outdoor compressor unit.
45 min · intermediate
Samsung — Error E1 indicates a failure in the indoor unit temperature sensor (thermistor), which prevents the air conditioner from reading room temperature accurately.
25 min · beginner
Samsung — Error E101 on a Samsung air conditioner indicates the indoor unit's PCB has not received any data from the outdoor unit for the timeout period (typically 4 minutes).
60 min · advanced
Samsung — Error E458 on a Samsung air conditioner indicates the compressor overload protection has tripped.
60 min · intermediate
Samsung — Error E466 on a Samsung inverter air conditioner indicates the DC link voltage on the inverter PCB is out of safe range.
30 min · beginner
Samsung — Error E5 on Samsung air conditioners signals a compressor failure or compressor protection circuit activation.
15 min · beginner
Voltas — Error E1 on a Voltas split air conditioner indicates a fault with the indoor air temperature sensor.
30 min · intermediate
Voltas — Error E2 on a Voltas split air conditioner indicates a fault with the indoor evaporator coil temperature sensor.
30 min · intermediate
Voltas — Error E3 on a Voltas split air conditioner indicates a fault with the outdoor unit temperature sensor (typically the outdoor coil or ambient temperature thermistor).
45 min · intermediate
Voltas — Voltas split AC error E4 indicates the indoor unit temperature sensor has failed or is reading erratic values.
25 min · intermediate
Voltas — Voltas split AC error E5 indicates a communication failure between the indoor and outdoor units.
30 min · advanced
Voltas — Error E6 on a Voltas split air conditioner indicates a communication failure between the indoor unit and the outdoor compressor unit.
60 min · advanced
Voltas — Error F1 on a Voltas split air conditioner indicates a fault with the indoor unit fan motor.
45 min · intermediate
Voltas — Error F2 on a Voltas split air conditioner indicates a fault with the outdoor unit fan motor.
45 min · intermediate
Voltas — Error F3 on a Voltas split air conditioner indicates the compressor overload protection has tripped.
60 min · intermediate
Voltas — Error F4 on Voltas air conditioners signals a compressor malfunction or failure.
15 min · beginner
Voltas — Error F9 on a Voltas inverter air conditioner indicates an outdoor DC fan motor fault — the outdoor condenser fan is not spinning at the speed the PCB commanded, or the board is getting no speed feedback from it.
30 min · intermediate
Voltas — Error P0 on a Voltas air conditioner indicates voltage protection has tripped: the input AC voltage is outside the safe operating range (typically below 180 V or above 250 V).
30 min · beginner
Voltas — Error P1 indicates Voltas Air Conditioner has detected abnormal voltage supply and activated its protection circuit.
15 min · beginner
Voltas — Error P4 on a Voltas inverter air conditioner indicates DC voltage protection has tripped — the outdoor inverter PCB has detected that the internal DC bus voltage (the direct current produced after the incoming mains is rectified) has gone above or below its safe operating window, and it has shut the compressor down to protect the IPM module and capacitors.
25 min · beginner
Voltas — A Voltas air conditioner that runs but does not cool usually falls into one of a few buckets: a settings or airflow problem you can fix yourself, a voltage-protection cut that stops the compressor, or a deeper fault like low refrigerant or a compressor failure that needs a technician.
40 min · beginner
Frequently asked questions
What are the most common air conditioner error codes in India?
The most frequently searched air conditioner error codes in India include Blue Star E6, Blue Star F2, Blue Star E1, Blue Star E2, Blue Star E3. Most of these are intermediate-level fixes that take 31 minutes on average.
Which air conditioner brands have the most error codes?
Among air conditioner brands sold in India, Voltas (15 codes), Daikin (11 codes), Blue Star (6 codes) have the most documented fault codes. More error codes doesn't mean less reliable — it often means better diagnostic reporting.
Can I fix air conditioner errors myself without a technician?
29% of air conditioner error codes we cover are beginner-level fixes requiring no special tools. The remaining codes need basic tools (multimeter, screwdriver set) and intermediate mechanical comfort. Every guide includes a "when to call a technician" section so you know exactly where the DIY boundary is.
Time to replace your air conditioner?
If repair cost exceeds 50% of a new unit price, replacing is usually smarter. Compare top-rated air conditioners in India.