Meltem G-4 Bathroom Fan Constantly Running Despite Light Switch and Fuse Adjustments

Question

Hello everyone I have a problem with a bathroom fan. The fan in the bathroom Meltem G-4 started working as the light in the bathroom was on for more than 30 sec and turned off 2 min after the light was off. I wanted to switch it to turn on a few minutes after the light was on. So I took apart...

stanislaw1954 · Answer

And which wire(s) is from the fan and where is it plugged in ?

vorion · Answer

It seems to me that the brown one at the top goes to the fan. That black wire at the bottom is described as L, but when I turn off the black one at the top, the bathroom light does not light up.

Anonymous · Answer

After turning on the fuse, wait three minutes, the fan should then turn itself off as long as you have not changed anything in the fan.

vorion · Answer

I waited after turning off the fuse for 20 minutes and every time I now turn on the fuse the fan also turns on. Even when the switch from the light is disconnected. It works as if it is permanently connected to the voltage.

mawerix123 · Answer

Better than looking for potentiometers at the switch. If it has a delay in operation then it must be permanently energized. I don't know if you have one exactly like this but see the description

Anonymous · Answer

The request in turn was: .

vorion · Answer

I still can't figure out what to do with this fan. It should turn on when it gets a signal from the lighting switch, but it turns on all the time even when it is disconnected from the switch. Can it be adjusted somehow?

Anonymous · Answer

Buddy, since you do not have some kind of meter and certainty that it is so connected, it will be difficult at a distance...
This brown one of yours should be Ls. As a rule, these fans have two knobs - one for the humidity level when it should turn on by itself, and the other for how long it should run after the voltage is removed from the Ls. Turning on the fuse, the circuit treats the same as giving a signal on Ls. You need to check what happens if you unplug Ls in the fan.

vorion · Answer

Thanks for your reply. Your schematic is clear and that's how it should be connected according to the instructions.

Unfortunately, there is a trick done here. In the picture you can see the connection of the fan. There are only two cables N and L coming in, L is also plugged into the Ls socket.
I have drawn what I think the wiring diagram of the fan looks like, I do not know what happens between the dashed lines and what right it worked.

Anonymous · Answer

If it is actually as shown in the picture, you need an electrician with a voltmeter and ohmmeter. You need to disconnect this entire circuit, check the identity of all available ends, change the polarity of L and N, reconnect the fan properly.

stanislaw1954 · Answer

In a circuit like yours, it could only work when voltage was applied by the switch and went off as the switch was turned off.

mawerix123 · Answer

Looking at the circuitry of this fan, it's hard to believe that it worked with a delay....

vorion wrote:
The Meltem G-4 bathroom fan started working as the bathroom light was on for more than 30 sec and turned off 2 min after the light was off.

It is likely that somewhere along the way there is still a timer controlling this fan.

When it comes to adjusting the operation, if I see it correctly there are two blue potentiometers

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Meltem G-4 Bathroom Fan Constantly Running Despite Light Switch and Fuse Adjustments

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