Getting a Faikout module fitted and onto your WiFi, from opening the box to controlling your Daikin from any browser. A typical setup takes about 15 minutes. There is no app to install, no account to create, and nothing in the cloud.

This covers the WiFi Faikout module running RevK's firmware (the device is branded Faikout; you may still see the older name Faikin). It works with single-split and multi-split Daikin systems over the S21, X50A or CN_WIRED connections, and the firmware works out which one your unit uses automatically.

1. What you need

• The Faikout module and the correct Faikin cable for your model. If you are not sure which cable you need, use the compatibility and cable finder at faikin.au.
• A 2.4GHz WiFi network and its password. (5GHz networks are not supported.)
• A phone, tablet or computer to do the setup.
• A screwdriver to open the indoor unit's cover.

You do not need an app, an account, a soldering iron, or a separate power supply. The module is powered by the air-con itself.

2. Safety first

Isolate power at the wall or the isolator switch before opening the indoor unit. There are dangerous voltages inside an air-con, and some connector types carry dangerous voltage even in normal operation.

If you are not comfortable working near the electrics, have an electrician or air-con installer fit the module. The wiring side takes only a few minutes for someone used to it.

3. Fit the module

Where the connector is. On a wall-mounted split, the control board is behind the front cover on the right-hand side, behind the electrical screw terminals. Ducted, cassette and floor-standing units place the board elsewhere, often in a separate control box. If you cannot find it, contact us and we will point you to it for your model.

Opening the unit. This teardown video (watch to about 2:30) shows how to get to the control board. It is a different model, but the principle is the same.

Plugging in.

1. Find the socket the Daikin WiFi module uses (or would use). It is the same connector your Faikin cable is made for.
2. Plug the Faikin cable into that socket, and the other end into the Faikout's 5-pin connector. The latest boards match the official Daikin WiFi-module plug.
3. The module is powered through this cable (it accepts 4 V to 40 V; the air-con supplies about 12 V), so there is nothing else to wire.

About the board. It ships as a small 70 x 70 mm scored panel. It works perfectly well left as-is, so you do not have to snap it down to size. Keep it clear of the mains terminals and any bare metal. A 3D-printable case design is available if you want one.

Refit the covers, restore power, and move on to the next step.

If you are wiring your own lead rather than using a Faikin cable, match GND, Power, Tx and Rx to the labels printed on the board.

4. Power up and check the LED

When power comes back, the module's LED lights up and starts blinking.

• A solid green for the first few seconds is normal start-up.
• It should then settle on white/red, which means "no WiFi configured yet". That is exactly what you want before the next step: it tells you the module is healthy and waiting to be set up.

If you get no LED at all, jump to Troubleshooting (section 11). The full colour guide is in section 9.

5. Connect it to your WiFi

1. On your phone, open WiFi settings and look for an access point called Daikin or Faikout. Connect to it (no password needed).
2. On an iPhone the setup page usually opens by itself. On other devices, open a browser and go to the gateway/router address shown in your phone's WiFi details for that connection.
3. Set a Hostname, a simple one-word name for this unit, for example GuestAC. This becomes the unit's web address and, if you use MQTT, its name there too, so choose it now.
4. Pick your WiFi network from the list (or type the name) and enter the password carefully. Remember, 2.4GHz only.
5. Optionally set your timezone so schedules run at the right local time.
6. Press Set. The module restarts and joins your WiFi.

6. Optional: Home Assistant and MQTT

Skip this if you only want browser control.

If you plan to use Home Assistant or another MQTT system, enter the MQTT host (your broker's IP address) plus a username and password on the same settings page. Home Assistant's broker normally needs a username and password, which you create in Home Assistant.

Full details, including the Home Assistant walkthrough and dashboard YAML, are in the MQTT manual. If you run Home Assistant but would rather not set up a broker, you can instead use Home Assistant's built-in Daikin integration and point it at the unit's IP address.

7. Use it

From any device on the same WiFi, open a browser and go to hostname.local, for example GuestAC.local.

You get a live control page with power, mode (heat, cool, auto, dry, fan), set-point, fan speed, louvre swing, and the live temperatures the IR remote hides. Changes you make on the remote show on the page within seconds, and the other way around.

A few tips:

• On a phone, use your browser's Add to Home Screen to get an app-like icon.
• The web page is local-network only by design, so nothing is exposed to the internet. For remote access, use a VPN back to your home network, or Home Assistant.
• For the extra automatic control layer (target band, schedules, an external temperature sensor), see the Faikout Auto manual.

8. Update the firmware

We recommend updating when you first receive the unit, as new features are added regularly.

Open the unit's web page, go to WiFi settings, and click Upgrade. This step needs internet access. The module fetches the latest firmware and restarts on its own.

9. LED reference

(The LED can be turned off with a setting if you prefer; loopback and offline states still show.)

10. Factory reset

If you are locked out, have forgotten a password, or want to start setup from scratch, factory reset the module: briefly short the two solder pads on the back of the module three times within three seconds. This clears the WiFi and password settings only.

After a reset the LED returns to white/red, and you start again from section 5. If you would like a photo showing exactly which pads to short, ask us.

11. Troubleshooting

No LED at all. Check the cable is fully seated at both ends and that the air-con has power. To confirm the module itself is alive, run the Loopback Test (separate manual): it checks the module independently of the cable and air-con.

Can't see the Daikin or Faikout WiFi network. Power-cycle the air-con. A white/red LED means it is in setup mode and the network should appear. If you set the unit up before, do a factory reset (section 10) to bring it back.

Connected, but hostname.local won't load. Make sure your phone or computer is on the same 2.4GHz network. Some networks block .local names; if so, find the unit's IP address in your router's device list and browse to that instead.

LED is magenta. The module is powered but not talking to the air-con. Check the cable is seated and that it is the right cable for your model (use the cable finder). The Loopback Test will tell you whether the fault is the module or the cable.

It won't join your WiFi. It must be 2.4GHz, not 5GHz. Re-enter the password carefully. Very long names or some special characters in the WiFi name or password may not be supported.

12. Advanced: re-flash the firmware

You only need this if you are completely locked out and a factory reset does not help. It overwrites the firmware and is for confident users.

You will need a USB-to-serial adapter and some Dupont wires (the latest boards have USB test pads, or use a TC2030 lead), and the correct firmware binaries for your board (PICO/S1 or S3) from the project releases.

Erase the flash:

esptool.py --chip esp32s3 erase_flash

Write the new firmware (S3 board):

esptool.py -p PORT write_flash 0x0 Faikout-S3-MINI-N4-R2-bootloader.bin 0x8000 partition-table.bin 0xd000 ota_data_initial.bin 0x10000 Faikout-S3-MINI-N4-R2.bin

or (S1/PICO board):

esptool.py -p PORT write_flash 0x1000 Faikout-S1-PICO-bootloader.bin 0x8000 partition-table.bin 0xd000 ota_data_initial.bin 0x10000 Faikout-S1-PICO.bin

Replace PORT with your adapter's port (for example /dev/ttyUSB0, or a COM port on Windows). After flashing, start again from section 5.

13. Quick reference

Source: RevK ESP32-Faikout Setup manual and firmware (codeberg.org/RevK/ESP32-Faikout). Behaviour described matches the firmware as of June 2026. See also the Faikin Faikout MQTT, Faikout Auto, and Loopback Test manuals.