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Why does your bathroom or kitchen extractor fan run when the switch is turned off?
Wiki User
∙ 14y ago
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A fan unit which has a timer in it must have two separate "hot" wires feeding it:
- A "non-switched hot", which is permanently fed with power from the breaker on the main supply panel. After the fan has been switched on using the "switched hot" wire described below, this "non-switched hot" wire keeps the fan running for the length of time the timer has been set for.
- A "switched hot" wire which should be connected to the on/off switch that controls the fan.
Depending on the actual design of the control circuitry inside the fan unit, if the above two "hots" have been connected to the fan unit the wrong way round, the result can be that the fan will "stay on and running" all the time, regardless of the position of the on/off switch for its circuit.
The solution is to switch off all the power at the main breaker panel and, after you have checked that no wires are still "hot" or "live", re-wire the "hots" on the fan unit the other way round:
- You must ensure that the "switched hot" connection on the fan unit is no longer connected to the permanent hot feed wire coming from the breaker on the main supply panel. (It should now be connected to the switched hot wire from on/off switch that controls the fan.)
- The "non-switched hot" connection on the fan unit isconnected to the permanent hot feed wire from the breaker on the main supply panel. (Instead of to the switched hot wire from the on/off switch that controls the fan).
More details:
If the fan stays on after it has been switched off there is probably a timer inside the fan unit which will turn the fan off after a set time. If the fan does not go off after 2 hours from switching it off then either the fan unit has no timer but has been wired up incorrectly - so that it is not controlled by the on/off switch (see above) or the timer may have been set to stay on continuously.
Sometimes a fan may come on when the switch for a light in the same room has been turned on but, if the fan has a timer, that timer will keep the fan running even after the light has been switched off.
Sometimes a fan may have its own on/off switch, separate to another switch controlling a light in the same room. In that situation you might switch off both the light and the fan but, if the fan has a timer, the timer will still keep the fan running even after the light has been switched off.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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∙ 14y ago
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