An AC error code is the air conditioner telling you what its self-test found. It may appear as letters and numbers on the display, such as E1 or E6, or as a pattern of blinking lights when there is no display. The meaning depends on the brand and the model year, so the same code can point to different faults on two units.
This guide helps you read the code the right way, shows the few safe checks any owner can do, and lists the brand guides for exact meanings. Anything that touches the outdoor unit, gas, wiring or the control board should be left to a trained technician.
Common causes
1Temperature sensor fault or loose sensor
How to tellCodes like E1, E2 or E3 on many models, and the AC cools badly or stops
What fixes itPower off and on once; if it returns, call authorised service
2Indoor and outdoor unit not communicating
How to tellCode appears within a minute or two of starting, outdoor fan silent
What fixes itCheck the breaker and isolator are on, then call service if the code stays
3Voltage too high or too low
How to tellCode appears during storms, power cuts or when other heavy loads start
What fixes itUse a stabiliser rated for the AC, and report repeated trips to your electrician
4Dirty filter or blocked airflow
How to tellPoor cooling, ice on the indoor coil, some overload or freeze codes
What fixes itClean the indoor filter and keep the area around both units clear
5Drain or water level problem
How to tellWater dripping indoors or a drain related code
What fixes itCheck the visible drain pipe is not kinked; service clears blockages
6Compressor or gas related fault
How to tellFan runs but no cold air, or code returns after every restart
What fixes itNeeds a trained technician; do not attempt refill or repair yourself
7Faulty control board or display
How to tellRandom codes, buttons not responding, or nothing on the display
What fixes itRepair by authorised service only
Where to start
Write down the exact code or blink count
Note the characters on the display or count the blinks of each light. Take a clear photo. This helps the technician and lets you look up the right brand page below.
Switch off at the remote, wait, then restart
Use the remote to stop the AC, give it five minutes, and then start it again. A one-time glitch from a power dip often clears this way.
Reset the power at the mains switch
Turn off the AC's wall switch or breaker for about ten minutes and turn it back on. Do not do this repeatedly, because frequent restarts strain the compressor.
Clean the indoor filter
Open the front panel as the manual shows, slide out the mesh filters, rinse gently in plain water and dry fully in shade before fitting them back. Airflow problems cause several codes.
Check the outdoor unit from outside only
Look for leaves, plastic or dust blocking the grille and make sure the fan is not obstructed. Never open the outdoor unit or touch wires.
Look at the supply
Is the power steady, are other appliances also flickering, and is the stabiliser (if you use one) working? Fix supply trouble through your electrician.
Match the code in the manual for your model
The booklet that came with the unit has a table of codes for that exact model. If the manual is lost, the brand's website or the brand guide below can help, but the manual wins.
Book authorised service if the code returns
If the code comes back after a restart, stop running the AC and book service. Keep the model number, the code and the purchase date handy. Running through a fault can turn a small repair into a large one.
AC error code meaning: how to read it
Most units follow a similar idea: codes starting with E often point to sensors, communication or protection, F codes usually mark a more serious fault such as a board or a gas side issue, and H, P or CH codes appear on specific brands. On most models, a code stays on the display until the fault clears or the power is cut.
The display shows E6 a minute after you start cooling. On many models this relates to the indoor and outdoor unit link or a protection trip. Look up your brand's page, run the safe checks, and call service if it returns.
Codes people search most
| Code | Common meaning | First safe check |
|---|---|---|
| E1 | Room or indoor coil sensor fault on many units | Power reset, then service |
| E2 | Another sensor or an indoor fan issue | Power reset, then service |
| E3 | Pipe sensor, or overload or protection on some brands | Clean filter, then service |
| E5 | Communication, overcurrent or sensor on different brands | Check supply, then service |
| E6 | Indoor and outdoor communication on many brands | Check breaker, then service |
| E7 | Often outdoor unit or protection related | Look at the grille from outside, call service |
| F1 and F3 | Board, sensor or compressor side faults on some brands | Technician only |
People also search for the AC E6 error code, the AC E3 error code, the AC E1 error code and the AC E2 error code as separate topics, and the table above answers all four at a glance. Free PDF lists of every AC error code online are often wrong for newer models, so treat them as a hint only. If your brand is not here, the model manual is the final word. Useful companions are AC not working and AC compressor not working.
Brand and appliance guides
| Open | Short note |
|---|---|
| Daikin AC error codes | Full list of display codes for that maker's units. |
| Voltas AC error codes | Meaning of E and F codes on that maker's units. |
| Blue Star AC error codes | Common display and blink codes for that maker. |
| IFB washing machine error codes | What the codes on front and top loaders mean. |
| LG washing machine error codes | Drain, door, water and motor codes explained. |
| LG AC CH10 error | One specific CH code and what to check first. |
| Blue Star AC E6 error | What an E6 usually means on that maker's unit. |
| Panasonic AC error codes | H and F codes shown on that maker's units. |
| Carrier AC error codes | Code list for that maker's split air conditioners. |
| LG AC error codes | CH codes and blink patterns on that maker's units. |
| Lloyd AC error codes | Display codes on that maker's air conditioners. |
| Samsung AC error codes | C and E codes on that maker's split units. |
| Washing machine not working | General checks when any washer will not start, drain or spin. |
| Daikin AC F3 error | What an F3 means and what you can safely check. |
| Haier AC error codes | Code list for that maker's split units. |
| AC not working or not cooling | Step by step help when the AC runs but does not cool or will not start. |
| Carrier AC E1 error | Meaning of E1 on that maker's units. |
| AC compressor not working | Signs of compressor trouble and why it needs a technician. |
| Haier AC E7 error | What E7 means on that maker's air conditioner. |
| Hitachi AC error codes | Codes and blink counts on that maker's units. |
| Ceiling fan not working | Slow, noisy or dead fan: capacitor, regulator and wiring clues. |
| Daikin AC U4 error | The U4 code between the indoor and outdoor unit. |
| Samsung washing machine error codes | Codes shown on front and top loaders. |
| Fridge not working | Not cooling, noisy or iced up: what to check before calling service. |
| Carrier AC E3 error | Meaning of E3 on that maker's units. |
| LG AC CH05 error | A specific communication code and what to check. |
| Voltas AC E6 error | Meaning of E6 on that maker's units. |
| Blue Star AC F2 error | What F2 means on that maker's air conditioner. |
| Samsung AC C4 error | The C4 code on that maker's units. |
| Lloyd AC E5 error | Meaning of E5 on that maker's units. |
| Home inverter not working | Backup inverter that will not switch on, charge or give backup. |
| Haier AC F1 error | What F1 means on that maker's air conditioner. |
| Godrej AC error codes | Code list for that maker's air conditioners. |
| Godrej AC E6 error | Meaning of E6 on that maker's units. |
Safe checks versus technician-only work
You can clean filters, check the remote batteries, confirm the breaker is on, clear dust from the outside grille and note down the code. Everything else is for a trained technician: opening the outdoor unit, touching the control board, handling gas or refrigerant, or bypassing a sensor.
Taking panels off yourself risks an electric shock and may end your warranty. Repair cost rises when a unit runs for weeks with a fault, when parts are on a compressor or board, or when the unit is out of warranty.
How to avoid error codes
Service the unit before summer, clean the filters every few weeks of use, fit a suitable voltage stabiliser if your area has swings, and keep the outdoor unit clear and shaded from heavy rain splash. Do not switch the AC on and off in quick succession.
Frequently asked questions
What does an AC error code mean?
It is the unit's own report of a detected fault, such as a sensor, communication or protection problem. The exact meaning depends on brand and model, so confirm it in your manual.
How to fix e6 error in split AC?
On many brands E6 relates to communication between the indoor and outdoor parts. Check that the breaker is on, restart once after a wait, and call authorised service if it returns.
How to fix e7 error on an air conditioner?
Glance at the outdoor unit from a safe distance for blocked airflow and restart once. Do not open the unit. If it comes back, book service.
Is there one AC error code list for all brands?
No. Brands use their own codes, and the same code can differ between models. A single list is a guide only, so match it with your own manual.
Can I keep using the AC with an error code showing?
Yes, when it cools well and the code showed up only once. If the code returns, there is noise, a burning smell or poor cooling, switch it off and call service.