Extractor fans are great at keeping our bathrooms condensation-free, but they do work very hard. The fan draws damp air out via a vent, but the fans will usually attract all kinds of dirt, which can clog them or stop them working efficiently. Cleaning them regularly can deal with the problem, but extractor fans are still liable to break down or malfunction on occasion.
If dirt or dust is clogging them then you should be able to take them down for a clean, but for anything else you will need a qualified electrician. They can deal with any problems that the motor may have developed and repair or replace this.
In many cases it will be cheaper to replace the extractor fan with a new one, but your electrician will be able to tell you if the unit can be repaired at a reasonable price. Other malfunctions can be down to the switch that turns the fan on. This is often connected to a light switch (so that the fan turns on when you switch your bathroom light on) and loose wires may need to be tidied up or a new switch installed.
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