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Extractor fan won't switch off
4 Answers
Any electricians out there please?
The extractor fan in our windowless downstairs toilet (which is activated by switching on the light via a pull chord )refuses to switch itself off, even when the light switch is pulled again to switch the light off.
It normally runs for a few minutes then switches itself off automatically but has now been running for several hours non-stop.
How can we get it to switch off?
The extractor fan in our windowless downstairs toilet (which is activated by switching on the light via a pull chord )refuses to switch itself off, even when the light switch is pulled again to switch the light off.
It normally runs for a few minutes then switches itself off automatically but has now been running for several hours non-stop.
How can we get it to switch off?
Answers
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The fan is a 30 year old Silovent make. It's built into the loo ceiling and there's no sign of any external timer, so presumably the time in somewhere inside?
So competent electricians in this house unfortunately. We've now stopped it by temporarily switching off the circuit breaker but this means we can't use the lavatory light any more as every time we switch it back on it restarts the fan again which still won't switch itself off.
So competent electricians in this house unfortunately. We've now stopped it by temporarily switching off the circuit breaker but this means we can't use the lavatory light any more as every time we switch it back on it restarts the fan again which still won't switch itself off.
Thes type of fans have 3 wires - 4 if it includes an earth.
There is a permanent live, a switched live, a neutral and the earth. The switched live is connected via the light switch and activates the timer mechanism. The timer and the fan need permanent electrical supply such that they can work 24/7.
Clearly the timer has gone kapput (technical term) and doesn't cut the supply to the fan after x minutes of overrun.
They aren't really serviceable and you've done pretty well if you have had 30 years of service.
To cut the fan off, you will have to find and disconnect this permanent live wire. Then you can work the light but the fan will do nothing.
There is a permanent live, a switched live, a neutral and the earth. The switched live is connected via the light switch and activates the timer mechanism. The timer and the fan need permanent electrical supply such that they can work 24/7.
Clearly the timer has gone kapput (technical term) and doesn't cut the supply to the fan after x minutes of overrun.
They aren't really serviceable and you've done pretty well if you have had 30 years of service.
To cut the fan off, you will have to find and disconnect this permanent live wire. Then you can work the light but the fan will do nothing.
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