Please Heeelp!!!

I just purchased a bathroom fan "Aero Still 100T" wich comes with a timer. This fan comes with 3 wires, white, red and black

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however I realized that the connection wires for Fans in my bathroom only has 2 wires: black and white

I tried connecting each wire to its matching color but the Fan does not do anything.

As aditional informtion the Fan goes connected to the light's switch (yes, the bathroom's light does work)

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1 Answer 1


You probably should use an English manual


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The diagram here shows how to connect from the L/N lines of the main panel to the 3 wires (L, LT, N). The second diagram is sharing a light on the same switch.

The S is a manual switch that is part of the circuit. If you do not want a manual switch, then they have a diagram further down to connect just the L and N and use the pull cord.

The way this device works is when you flip the switch to "off", it keeps running for 2 to 30 minutes after it is "off". Obviously, if all you have is L and N, then it won't have power, so the L wire is split into L and LT. Your light switch connects to LT and it tells the fan to "turn on" or "start turn off timer", while it runs off the normal L and N lines.

Beyond that, if you don't know how to split a line, then this installation is beyond your ability and you need to hire an electrician.

Note: The likelihood of your existing wiring having the 2nd live wire is next to none. In your original setup, it would only need one live from the main panel to the switch, and one live from the switch to the fan. This setup requires two live wires; one directly from main panel to the fan and one from the main to switch, then to the fan. There's no reason for anyone to wire it like that with a normal switch, so your new fan probably won't work with a switch. You may have to go with the L/N connection in Figure 13.

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  • Sometimes the simple thing is to find the right directions.+
    – Ed Beal
    Jun 29, 2020 at 16:43
  • Many thanks for your answer. I think I am gonna go for someone experienced.
    – Nikko
    Jul 3, 2020 at 17:02

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