How To Fix A Bathroom Extractor Fan

Contents:

• Key takeaways
• Identifying the problem
• Tools you may need to fix your bathroom extractor fan
• Fixing the problem
• When to repair vs replace your extractor fan
• Common mistakes to avoid when fixing your extractor fan
• FAQs

A bathroom extractor fan is an essential household fixture to keep moisture, steam and odours under control. Over time, it can stop working properly - whether it’s making unusual noises or failing to turn on. This is usually caused by common issues such as dust build up, worn-out parts or minor electrical faults. Understanding these problems and knowing how to address them is vital in ensuring your extractor fan runs smoothly and efficiently. 

Many of these issues can be fixed without the need to replace the unit, with the right approach you can easily restore your fans performance and improve ventilation in your bathroom. This guide will walk you through how to identify the issue, successfully repair and when it’s time to upgrade your fan.

Importance: it’s essential your bathroom extractor fan works properly to prevent moisture, steam and mould from your bathroom.

Safety: always ensure the power is switched off by the consumer unit before fixing your fan.

Maintenance: it’s vital that you keep the area surrounding your extractor fan (and the blades) clean and free from dust and mould.

Professional: due to high-risk bathroom electrical zones, it’s vital that you don’t carry out any wiring work yourself unless you are a qualified electrician.

Identifying the exact problem with your bathroom fan is the most important part as it will determine your next steps. It’s crucial to observe how the fan behaves when it’s switched on before taking any further steps. Pay attention to whether it starts, what sounds you can hear like humming or rattling, and how strong the airflow feels. These observations will help towards the root cause and solution. 

Common signs that your bathroom extractor fan may need fixing (or replacing) include:

• The extractor fan doesn’t turn on at all

• There’s excessive noise (humming, rattling, buzzing)

• The fan turns on but is weak

• The fan continuously runs after turning off

Here is a breakdown of potential tools you may need to repair your extractor fan.

• Non contact voltage tester (mandatory, to ensure the power is off)

• Cleaning supplies

• Screwdriver (to remove the cover)

• Stepladder (for hard to reach fans)

• Appropriate PPE (if accessing wires)

Once you have observed how your fan behaves and potentially identified the issue, you’ll need to understand how to fix it.

Safety considerations

Before fixing your extractor fan, it’s crucial to consider the safety factors first.

• Always ensure you turn off power at the consumer unit (fuse box).

• Confirm the fan is dead (with no lights and no noise).

• Call a professional if you are unsure of the issue/how to fix it as bathrooms are high-risk electrical zones, so it’s important to only proceed if you’re comfortable and competent. 

No power

If the fan is completely unresponsive and doesn’t turn on (with no noise, movement or airflow), then the issue is usually electrical. This could be something simple like a tripped breaker, blown fuse or faulty switch. 

• Power supply - you should first check the power supply to ensure the extractor fan is receiving power. 

• Test the switch - in many bathrooms the fan is wired to the light or by an isolator switch outside the room, so you should check these are switched on as they can fail internally.

• Wiring - examine the connections to see if there are any loose or damaged wires, as the problem may be within the fan itself.

If one of the above is the issue you will need to call in a qualified electrician to fix the problem.

Unusual noises

Extractor fans that produce a lot of noise can indicate a few different issues - these include loose parts, dust in the fan or worn parts. 

• Humming - if you can hear a low humming sound, it may mean the blades aren’t spinning properly, which means the fan is receiving power but the motor can’t turn. This is usually caused by a build-up of dust or debris blocking the blades. You should thoroughly clean away any unwanted particles. If the blade does move slowly, it may mean the motor is struggling and could indicate that it’s nearing the end of its lifespan, in which case a replacement may be needed.

• Rattling (or vibrating) - if you can hear rattling, buzzing or vibration, this often points towards a loose part (like screws) or damaged blades catching on the edge. You should first try to tighten any loose covers or screws.

• Grinding - if you can hear harsh scraping or metal grinding, it usually indicates worn-out motor bearings. If this isn’t the case, it could be due to a lack of lubrication inside the motor or internal motor damage.

• Clicking - if you can hear repeated clicking or tapping, this could suggest that there is something obstructing the blades. Inspect them carefully by spinning the blade by hand. You should be checking if they are bent or misaligned as this can cause the clicking sound. You may need to replace the unit if you can’t adjust the blade. 

• Whistling - if you can hear high-pitched squealing or whistling, this could indicate that air is struggling to pass through the system. This could be due to a blocked duct or vent. Make sure to clean thoroughly, or replace your ducting if needed.

• Roaring - if you can hear a strong rush of air, this is usually down to the fan working harder than normal due to a blockage. 

Lacking efficiency

If your extractor fan does run but seems weak and fails to clear steam or moisture it’s usually an airflow-related problem. It’s common for dust and debris to coat the blades which reduces efficiency. It’s essential to keep the blades clean to ensure they can rotate freely. 

The ducting can also become blocked or restricted by a build-up of dust, grease or debris. Regular cleaning of the vents can help maintain performance and allow for optimal extraction.  

Continuous running

If your fan doesn’t turn off or runs longer than expected it’s often linked to built-in features. This could be caused by a faulty timer or humidity sensor malfunction. You should check the settings of both and replace them if necessary.

If your extractor fan is continuously operating it not only wastes energy, but also can cause premature wear of the components, so it’s important to sort this as soon as possible.

Condensation and mould

Extractor fans should effectively prevent mould growth and condensation build up in your bathroom. If you notice that mould and mildew is growing around your fan, it might mean that you need to improve the ventilation. Ensure that the extractor fan is properly sized for the room, and that it’s in regular use (particularly when showering) to reduce steam and humidity. Maintaining a mould-free environment is essential for protecting your physical health and the structural integrity of your home. Read our guide on how to remove mould from silicone for further guidance.  

Knowing when to replace your extractor fan can save time and money. Unusual noises, reduced airflow or dust build-up can be managed with the steps above - however, if the fan is frequently breaking down, is very old or failing to remove moisture it may be best to replace it altogether. Investing in a new bathroom extractor fan can provide better performance, improved efficiency and help prevent mould and odours in your bathroom. 

Here are some common mistakes to avoid when trying to fix your bathroom extractor fan.

• Not turning the power off properly - it’s essential to make sure the power is completely off before proceeding. Many fans have a permanent live feed even when the light is off, so you must double-check.

• Not cleaning properly - it’s common to assume the fan is broken when it’s just dirty. Proper cleaning and maintenance is crucial to ensure your fan continues to operate as normal and extend its lifespan.

• Incorrect settings - if your fan is running for too long or doesn’t switch off, then this could be due to the settings being wrong. You should avoid randomly adjusting settings and note its original position first.

• Assuming the fan is the issue - the problem could be from a faulty switch, tripped breaker or a wiring issue, so it’s crucial to check all of these before assuming the fan needs replacing.

• Buying the wrong replacement - if you need to buy a new extractor fan it’s important to ensure you purchase the correct one. You should match the duct size, extraction rate and mounting type (ceiling/wall) to ensure it will fit.