esphome sonoff ifan03 in 2025 https://community.home-assistant.io/t/ifan03-on-esphome-working-well-sort-of/197730

esphome_ifan03.yaml

substitutions:
  name: "buro-fan"
  friendly_name: "Büro Ventilator"
  comment: "Sonoff Ifan03 Ventilator (ESP01 1M)"
  on_boot_light: ALWAYS_ON # or ALWAYS_OFF
  spare_button_light_entity: "light.buro"

esphome:
  name: $name
  comment: $comment

esp8266:
  board: esp01_1m

api:
  encryption:
    key: !secret api_encryption

ota:
  - platform: esphome
    password: !secret ota_password

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:
    ssid: "$name Fallback Hotspot"
    password: !secret wifi_password

captive_portal:

logger:
  level: ERROR

sensor:
  - platform: wifi_signal
    name: "$name WiFi Signal"
    update_interval: 60s
    entity_category: diagnostic

button:
  - platform: restart
    name: "$name restart"
    entity_category: diagnostic
  
  - platform: template
    name: "$name Buzzer"
    id: buzzer
    on_press:
      - switch.turn_on: buzzer_switch
      - delay: 50ms
      - switch.turn_off: buzzer_switch

text_sensor:
  - platform: uptime
    name: "$name Uptime"
    entity_category: diagnostic

  - platform: wifi_info
    ip_address:
      id: wifi_ip
      name: "$name IP Address"
      entity_category: diagnostic

output:
  - platform: gpio
    id: light_relay
    pin: GPIO9
    inverted: true

switch:
  - platform: gpio
    internal: True
    id: buzzer_switch
    name: "Buzzer"
    pin:
      number: GPIO10
      inverted: true

  - platform: gpio
    internal: true
    pin: GPIO14
    id: fan_relay1
    restore_mode: ALWAYS_OFF

  - platform: gpio
    internal: true
    pin: GPIO12
    id: fan_relay2
    restore_mode: ALWAYS_OFF

  - platform: gpio
    internal: true
    pin: GPIO15
    id: fan_relay3
    restore_mode: ALWAYS_OFF

light:
  - platform: binary
    name: "$friendly_name"
    output: light_relay
    id: ifan03_light
    restore_mode: $on_boot_light

fan:
  - platform: template
    id: ifan03_fan
    name: "$friendly_name"
    speed_count: 3
    restore_mode: NO_RESTORE # important
    on_turn_on:
      - switch.turn_on: fan_relay1
      - switch.turn_off: fan_relay2
      - switch.turn_off: fan_relay3
    on_turn_off:
      - switch.turn_off: fan_relay1
      - switch.turn_off: fan_relay2
      - switch.turn_off: fan_relay3
    on_speed_set:
      lambda: |-
        if (id(ifan03_fan).speed == 1) {
          id(fan_relay1).turn_on();
          id(fan_relay2).turn_off();
          id(fan_relay3).turn_off();
        } else if (id(ifan03_fan).speed == 2) {
          id(fan_relay1).turn_on();
          id(fan_relay2).turn_on();
          id(fan_relay3).turn_off();
        } else if (id(ifan03_fan).speed == 3) {
          id(fan_relay1).turn_off();
          id(fan_relay2).turn_off();
          id(fan_relay3).turn_on();
        }

remote_receiver:
  pin: GPIO3
  dump: raw

binary_sensor:
  # remote button row 3 button 1
  - platform: remote_receiver
    name: "$name Fan Off"
    id: remote_0
    raw:
      code: [-207, 104, -103, 104, -104, 103, -104, 207, -104, 103, -104, 104, -103, 104, -104, 103, -104, 105, -102, 104, -725, 104, -311, 103, -518, 104, -933, 103, -104, 104, -725, 104, -932, 104, -207, 207, -519]
    on_release:
      then:
        - fan.turn_off: ifan03_fan
        - button.press: buzzer
    internal: true        
  # remote button row 3 button 2    
  - platform: remote_receiver
    name: "$name Fan Low"
    id: remote_1
    raw:
      code: [-207, 104, -104, 103, -104, 104, -103, 207, -104, 104, -103, 104, -104, 103, -104, 104, -103, 104, -104, 103, -726, 103, -312, 103, -518, 104, -933, 103, -104, 104, -725, 104, -103, 104, -726, 103, -104, 311, -518]
    on_release:
      then:
        - fan.turn_on:
            id: ifan03_fan
            speed: 1
        - button.press: buzzer
    internal: true    
  # remote button row 2 button 2 
  - platform: remote_receiver
    name: "$name Fan Medium"
    id: remote_2
    raw:
      code: [-208, 103, -104, 104, -103, 104, -103, 208, -103, 104, -104, 103, -104, 104, -103, 104, -104, 103, -104, 103, -726, 104, -310, 104, -518, 104, -933, 103, -104, 104, -725, 104, -207, 104, -622, 103, -416, 102, -415]
    on_release:
      then:
        - fan.turn_on:
            id: ifan03_fan
            speed: 2
        - button.press: buzzer
    internal: true    
  # remote button row 2 button 1    
  - platform: remote_receiver
    name: "$name Fan High"
    id: remote_3
    raw:
      code: [-207, 104, -104, 103, -104, 104, -103, 208, -103, 104, -104, 103, -104, 104, -103, 104, -104, 103, -104, 103, -726, 104, -311, 104, -518, 103, -934, 103, -103, 104, -726, 103, -104, 207, -622, 104, -103, 104, -207, 104, -415]
    on_release:
      then:
        - fan.turn_on:
            id: ifan03_fan
            speed: 3
        - button.press: buzzer
    internal: true    
  # remote button row 1 button 1    
  - platform: remote_receiver
    name: "$name Fan Light"
    id: remote_light
    raw:
      code: [-207, 104, -103, 104, -104, 103, -104, 207, -104, 103, -104, 104, -103, 104, -103, 104, -104, 103, -104, 104, -725, 104, -311, 103, -518, 104, -933, 103, -104, 103, -726, 103, -311, 104, -518, 104, -207, 104, -103, 104, -414]
    on_release:
      then:
        - light.toggle: ifan03_light
        - button.press: buzzer
    internal: true      
  # remote button row 1 button 2 - used to call a home assistant service
  - platform: remote_receiver
    name: "$name Spare Button"
    id: remote_spare_button
    raw:
      code: [-207, 104, -103, 104, -104, 103, -104, 207, -104, 103, -104, 103, -104, 104, -103, 104, -103, 104, -104, 107, -721, 105, -206, 207, -518, 105, -931, 104, -104, 103, -725, 104, -104, 103, -725, 104, -104, 103, -207, 104, -414]
    on_release:
      then:
        - homeassistant.service:
            service: light.toggle
            data:
              entity_id: $spare_button_light_entity
        - button.press: buzzer
    internal: true

I thought this also first, but you always need to enable relay one to get energy for two and three.

Hmn...

That's strange, I assume that there are different revisions of ifan3.

if i use your script as you have built it, then my fan turns very fast on level 2 and 3 and hums very unhealthy (loud)

with my customization everything is as usual and ok.
in my old script this was also solved in the conditions:

   - if:
       condition:
         and:
           - switch.is_on: relay_fan1
           - switch.is_off: relay_fan2
           - switch.is_off: relay_fan3
       then:
         - fan.turn_on:
             id: ${slug}_fan
             speed: 1
   - if:
       condition:
         and:
           - switch.is_off: relay_fan1
           - switch.is_on: relay_fan2
           - switch.is_off: relay_fan3
       then:
         - fan.turn_on:
             id: ${slug}_fan
             speed: 2
   - if:
       condition:
         and:
           - switch.is_off: relay_fan1
           - switch.is_off: relay_fan2
           - switch.is_on: relay_fan3
       then:
         - fan.turn_on:
             id: ${slug}_fan
             speed: 3

But no offense, I just wanted to share my experience.

Best Regards
Hannes

thats strange :D

previously i used the following code and migrated this for myself to "yaml only" stuff cause of removed platform: custom from esphome.

https://github.com/Jaco1990/sonoff_ifan03_esphome_ha/blob/main/ifan03.h

for my ifan03 speed 2 is the same as speed 1 if i only turn on relay 2

but your right for speed 3 only relay 3 is required (i changed this in this gist).

thanks for your advice

So here I am again :-)

I think I know the reason or have a hunch.

It's not the ifan3 that's different, it's the fan that's attached to it.

My fan still has a pull cord on the side with which I can adjust the speed by hand or have to if I don't use a remote control at all.

If I set the cord incorrectly, for example, the fan doesn't come on at all because it is set to OFF. 2 moves further it shows the behavior as you described for level 2.

Apparently the switch disconnects parts of the motor winding or connects other windings.

So my fan with the pull cord is set to level 3 (1 position before OFF) and this works for me with the individual relay control.

I assume that this is also how it is intended... The fan should be at max rotation and the ifan switches the voltage or windings on and off.

Fortunately, we're all tinkerers and research things like this.

I think there is no right or wrong to what you enter in the script because you don't know (at least with my model) how the pull cord is positioned.

Best Regards
Hannes