Common AC Error Codes in India and How to Respond to Them
In many homes, a split or window AC suddenly stops working and starts blinking repeatedly. Sometimes a code flashes on the remote or indoor unit display. This is your AC’s built-in way of telling you what’s wrong.
While it may seem technical, these AC error codes are useful they save time, help identify problems early, and let service teams fix issues faster.
1. Where to Spot the Error Code on Your AC
You don’t always need a smart AC or app to read the error. Here’s how to check:
Blinking LED Pattern
- Count how many times the light blinks before a pause
- Some ACs blink once, pause, then repeat; others use rapid blinking
AC Remote Display or Panel
- Many brands like LG, Daikin, Voltas, and Hitachi show codes like CH38, U4, or E6
- Some smart models show it on your remote screen or app
AC User Manual or Service App
- LG ThinQ, Voltas Smart, Panasonic Miraie all include error look-up
- Or check the physical manual for your model’s code list
2. What Common Error Codes Mean in Indian ACs
Here’s a list of the most common error codes by popular AC brands in India:
LG
- CH38 – Low gas/refrigerant
- CH05 – Indoor and outdoor units not communicating
- CH04 – Temperature sensor issue
Daikin
- U4 – Signal error between indoor and outdoor units
- A3 – Water drainage issue
- E5 – Overheating or inverter problem
Voltas
- E1 – Coil temperature sensor error
- E2 – Indoor temperature sensor fault
- E6 – Outdoor unit problem (fan or board)
Panasonic
- H11 – Link error (communication fault)
- F90 – Inverter drive error in outdoor unit
- H14 – Fan motor or fan speed error
Hitachi
- F3 – Compressor temperature too high
- E7 – Indoor blower motor issue
- C5 – Gas leak or pressure issue
Always cross-check your AC model’s specific code chart for accuracy, as meanings can vary slightly.
3. Should You Try Fixing AC Yourself?
Some error codes relate to simple issues, while others need expert help. Here’s a quick guide:
| Code Type | What It Usually Means | Can You Fix It? |
|---|---|---|
| Filter or sensor error | Dirty filter or loose sensor wire | Maybe – clean/check |
| Drain error | Water not flowing properly | Yes – check pipe |
| Refrigerant/gas issue | Low pressure, coil freezing | No – call technician |
| Outdoor fan or inverter | Hardware failure | No – needs service |
| Communication failure | Wiring or PCB issue | No – call brand |
4. What to Do When You See an AC Error Code
Step 1: Note the Code or Blink Pattern
- Count LED blinks or write down the displayed code
- Take a photo if needed
Step 2: Turn Off and Restart
- Turn off the AC
- Switch off the power at the MCB
- Wait 3-5 minutes, turn it back on
If the error remains, it’s not a glitch.
Step 3: Check for Visible Problems
- Look for dirty filters, water near the drain, or fan noise
- If your AC is dripping or airflow is weak, mention this in your service call
Step 4: Call the Brand Service Helpline
- Mention the error code, symptoms, model number, and when it started
- This helps them bring the right tools and replacement parts on the first visit
5. Avoid Frequent AC Error Codes
- Clean air filters every 2-3 weeks
- Flush the drain pipe once every 1-2 months
- Install a voltage stabilizer if your area faces fluctuations
- Book a full AC service once a year to clean coils, check gas, and inspect PCB
- Don’t run the AC at 18°C for hours it stresses components and sensors
6. Error Code Reference Table for AC Users in India
| Brand | Error Code | What It Means | Action |
|---|---|---|---|
| LG | CH38 | Low refrigerant | Technician check |
| Daikin | U4 | Indoor-outdoor link failure | Service required |
| Voltas | E1 | Coil sensor fault | Clean or replace |
| Panasonic | H11 | Signal error between units | Service call |
| Hitachi | F3 | Compressor temp too high | Service needed |
Understanding AC error codes helps you become a smarter user. You don’t have to be an expert; just observe, document, and act promptly.
