Hi experts. I don't know whether anyone can throw any light on this, but, about four months ago, I installed a new extractor fan in the bathroom The make/model is stated to be: GXC6EC kitchen fan with pullcord. It works fine and I am very satisfied with it.
A month after that, I installed exactly the same model of fan in the kitchen (above the gas-stove). When it was first switched on, it was just as it ought to have been — it ran smoothly and was fairly quiet, like the other one. However, within a week or two, it started to make a knocking sound, which, though only faint, is quite noticeable. It's as if one or more of the blades of the fan is catching, very slightly, on something. Yet, I don't see how this is possible because it locates within the casing on the wall, quite rigidly — surely, there cannot be any movement of the motor and blades, within the case? If it is left running for (say) fifteen minutes, the sound gradually disappears and it sounds normal. This happens whether the weather is windy or not.
The strange thing is that this does not happen every time. There are relatively rare times when, right from being switched on, it runs smoothly.
As long as this fan works, I am stuck with it. However, it would be good to find out why the slight knocking noise happens. Has anyone any ideas about this?
With thanks for any helpful comments,
L.L.
A month after that, I installed exactly the same model of fan in the kitchen (above the gas-stove). When it was first switched on, it was just as it ought to have been — it ran smoothly and was fairly quiet, like the other one. However, within a week or two, it started to make a knocking sound, which, though only faint, is quite noticeable. It's as if one or more of the blades of the fan is catching, very slightly, on something. Yet, I don't see how this is possible because it locates within the casing on the wall, quite rigidly — surely, there cannot be any movement of the motor and blades, within the case? If it is left running for (say) fifteen minutes, the sound gradually disappears and it sounds normal. This happens whether the weather is windy or not.
The strange thing is that this does not happen every time. There are relatively rare times when, right from being switched on, it runs smoothly.
As long as this fan works, I am stuck with it. However, it would be good to find out why the slight knocking noise happens. Has anyone any ideas about this?
With thanks for any helpful comments,
L.L.
