Wellness & Aromatherapy: Common Problems & How to Fix Them
Published 2026-08-01 · Updated 2026-08-01
The Nest & Yard editorial team
Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-08-01.
Our pick: the ASAKUKI 300ml Essential Oil Diffuser, Ultrasonic Aroma Diffuser and Humidifier — the best Wellness & Aromatherapy we tested, from £21.99.
So you’ve invested in a way to bring the benefits of wellness and aromatherapy into your home – perhaps an ultrasonic diffuser like the ASAKUKI range, a sleep mist such as the This Works Deep Sleep Pillow Spray, or even a simple essential oil mist diffuser? It's fantastic to be exploring these techniques for relaxation and mood enhancement, but sometimes things don’t quite work as expected. This guide focuses on straightforward checks you can perform to address common issues with your aromatherapy products, ensuring they’re operating correctly and delivering the intended experience – remember if anything seems beyond simple adjustments, seeking advice from a qualified professional is always advisable.
See the full range in Wellness & Aromatherapy.

#1 Pick
ASAKUKI 300ml Essential Oil Diffuser, Ultrasonic Aroma Diffuser and Humidifier- Ultrasonic, USB Powered
£21.99
Pros
- Compact 300ml size suits smaller rooms and bedrooms
- 7 LED colour light settings for a calming glow
- Auto shut-off protects against running dry
Cons
- Smaller tank needs refilling more often than larger models

#2 Pick
ASAKUKI 500ml Essential Oil Diffuser, 5-in-1 Ultrasonic Diffuser Humidifier with 7 LED Colour Light- Ultrasonic
£25.99
Pros
- Near-silent operation under 23dB
- Auto shut-off when the water runs out
- 7-colour LED mood lighting
Cons
- Plastic housing feels less premium than wood or ceramic

#3 Pick
This Works Deep Sleep Pillow Spray, 75ml Lavender, Camomile and Vetivert Sleep Mist- Manual/Passive
£22.00
Pros
- Science-backed lavender and camomile blend
- Simple spritz-on-pillow application before bed
- Long-standing bestseller with a large review base
Cons
- Pricier per ml than basic pillow sprays
#4 Pick
Air Wick Essential Mist Diffuser Kit, Linen & Petals- Plug-in Mist Diffuser
£16.14
Pros
- Well-known, widely trusted household brand
- Diffuser kit includes plug-in base and refill bottle
- Consistent, long-lasting fragrance dispersal
Cons
- Refills are an ongoing cost versus essential oils
FAQ
My diffuser isn’t turning on at all.+
Firstly, check the power outlet with another device to rule out a general electrical issue. Then, ensure the diffuser is fully plugged in and that the cable isn't damaged; try a different UK plug if possible. If it still won’t turn on, verify the battery (if applicable) is correctly installed and charged.
My essential oil diffuser smells weak – like it’s not putting much scent into the air.+
The most common cause is a dirty ultrasonic disc. Gently clean the disc with a slightly damp, lint-free cloth – avoid using harsh chemicals or abrasive cleaners. Also, check that you’re using a sufficient amount of oil; many diffusers require at least 5-10 drops for optimal scent diffusion.
My reed diffuser isn't releasing any fragrance.+
Reed diffusers rely on capillary action to draw the oil up the reeds. Ensure the reeds are clean and free from dust or debris, as this can block the flow. Also, check that the bottle is tilted slightly so the oil can reach the reeds – it needs a constant supply.
My aromatherapy lamp is making a strange buzzing noise.+
Buzzing sounds often indicate an issue with the vibration motor. Try moving the lamp to a different location, away from electronic devices or metal objects that might be causing interference. If the noise persists, it may require professional attention.
My ultrasonic diffuser is leaking water.+
Check that the water reservoir is filled to the correct level – typically indicated by a ‘Max’ line. Ensure the unit is placed on a stable, level surface and isn't tilted. If leakage continues, discontinue use immediately and consult manufacturer guidance.
My aromatherapy burner isn’t producing a flame.+
Firstly, confirm you are using the correct type of oil for your burner (e.g., specifically designed for tea lights). Secondly, check that the wick is clean and not clogged with wax residue; gently straighten it if necessary.
My diffuser’s light isn't working+
Ensure the light function is activated via the control panel or button. Sometimes a simple reset can resolve this - try switching the diffuser off completely for 30 seconds and then turning it back on. If the issue continues, contact the manufacturer.
My reed diffuser has separated – oil at the bottom, water above+
This usually happens when the air bubbles trapped within the reeds have dissipated. To re-establish capillary action, gently tap the bottle firmly on a hard surface to dislodge any remaining air bubbles and then reposition the reeds.
My diffuser isn’t charging (if it’s rechargeable).+
Verify that the charging cable is securely connected to both the diffuser and a functioning UK mains outlet. Try a different UK plug to rule out an issue with the original socket, and check the charger itself for any damage.
My aromatherapy warmer isn’t heating up.+
Check that the power cable is securely plugged in and that the outlet is providing power. Ensure the warmer isn't placed on a cold surface, as this can affect its ability to heat. If it still doesn't heat, discontinue use and seek professional assistance.
In depth
The diffuser isn’t turning on or starting
A common frustration is when your aromatherapy diffuser simply won’t switch on. Before assuming a major fault, let's explore some readily identifiable causes. First, ensure the unit is receiving power. Check that the device is plugged securely into a functioning UK mains socket. Test the socket with another appliance to confirm it’s supplying electricity – a tripped fuse or a faulty socket can easily cause this issue. If you’re using a battery-operated diffuser, verify the batteries are correctly installed and have sufficient charge. Consider replacing them with fresh ones, as depleted batteries often fail to provide adequate power. Inspect the power button itself; sometimes debris or dirt can interfere with its operation. Gently clean around the button with a dry cloth. Finally, check that any indicator lights on the device are illuminated when you press the power button – this indicates a basic electrical connection is being established. If none of these steps resolve the problem, and the unit remains unresponsive, it’s advisable to cease further attempts at self-diagnosis and consult with a qualified electrician or contact the manufacturer for assistance. Electrical components can be complex; attempting repairs yourself carries significant risk.
The diffuser is underperforming – weak scent output
If your aromatherapy diffuser isn't releasing fragrance as strongly as you expect, several factors could be contributing to this. The most frequent cause is likely an insufficient amount of essential oil being added to the water reservoir. Refer to the manufacturer’s instructions for the recommended volume. Adding too little oil will naturally result in a weaker scent throw. Conversely, using excessive amounts can also lead to reduced performance, as it might overwhelm the diffuser's mechanism. Also check that the water level is appropriate; adding too much water will dilute the essential oils and weaken their fragrance. Ensure you’re using genuine, high-quality essential oils – lower quality oils may contain additives or be less concentrated, impacting their scent potency. Clean the diffuser thoroughly to remove any build-up of oil residue, which can restrict airflow and diminish performance. Finally, consider the ambient temperature – in colder environments, the diffusion rate might be reduced naturally. If after confirming these factors your diffuser is still struggling to produce a noticeable aroma, it’s important not to continue using it as the mechanism could be malfunctioning. Seek advice from the manufacturer or an experienced aromatherapist.
Unusual noises emanating from the diffuser
Strange whirring, buzzing, or gurgling sounds coming from your aromatherapy diffuser can indicate several potential issues. These noises often relate to airflow problems within the device. Begin by checking that the unit is placed on a stable, level surface; an uneven surface can cause vibrations and contribute to unusual sounds. Ensure nothing is obstructing the air intake vents of the diffuser – dust, debris, or even small objects nearby could be interfering with the flow of air. Gently clean the air inlet and outlet ports using a soft brush or dry cloth to remove any blockages. If your diffuser utilises ultrasonic vibration, it's possible that mineral deposits from hard water are building up inside the reservoir and generating noise. Try refilling the water tank with distilled or filtered water to eliminate this possibility. If the noises persist after cleaning and checking for obstructions, the internal mechanism may be failing – particularly if it is a vibrating type diffuser. Do not attempt any repairs yourself; electrical components can pose a hazard. Immediately discontinue use and contact the manufacturer for support, especially if the noise is accompanied by vibrations or overheating.
A leak from the water reservoir
Discovering a leak in your aromatherapy diffuser’s water reservoir is understandably concerning. The most common cause is usually mineral deposits that have built up over time due to hard water. This scale can compromise the seals and gaskets within the unit, allowing water to escape. Firstly, ensure the diffuser has been completely dry before attempting any troubleshooting steps. Clean the reservoir thoroughly with distilled water – do not use harsh chemicals or abrasive cleaners, as these could damage the plastic. If a significant amount of mineral deposit is present, you can try soaking the reservoir in a solution of equal parts white vinegar and distilled water for 30 minutes, followed by thorough rinsing with distilled water. Avoid overfilling the reservoir to prevent splashing and potential leaks. If the leak persists after cleaning and refilling with distilled water, it indicates a problem with the internal seals or gaskets, which require professional attention. Do not attempt to disassemble or repair the diffuser yourself; this could lead to electrical damage or pose a safety risk. Contact the manufacturer for guidance.
The diffuser isn’t charging (if applicable)
For electric diffusers that utilise a charging base, a non-functioning charger is a frequent cause of issues. Start by verifying that the charging cable is securely connected to both the diffuser and the mains socket. Inspect the cable itself for any visible damage – cuts, kinks or frayed wires can disrupt the electrical connection. Test the outlet with another appliance to confirm it’s supplying power correctly. Ensure you are using the correct type of charger supplied with your diffuser; attempting to use a third-party charger could damage the unit. Check the charging base for any obstructions that might be preventing adequate contact between the diffuser and the charging surface. Clean both the charging base and the diffuser contacts with a dry, lint-free cloth. If the charging indicator light doesn’t illuminate when connected to the mains, it suggests a problem with the charger itself, or possibly an internal fault within the diffuser. Again, do not attempt any repairs yourself; electrical components can be dangerous. Seek assistance from a qualified electrician or contact the manufacturer for support.
The diffuser has an unusual odour
An unpleasant smell emanating from your aromatherapy diffuser is often due to residue build-up, particularly if you've been using heavily scented oils frequently. Immediately discontinue use of the diffuser until it’s thoroughly cleaned. Empty any remaining water and oil from the reservoir. Clean the reservoir and all other components with a solution of mild dish soap and warm water – avoid harsh chemicals or abrasive cleaners that can damage the plastic. Rinse thoroughly with distilled water and dry completely before refilling. If the odour persists, try running a small amount of diluted white vinegar (1 part vinegar to 10 parts water) through the diffuser to neutralise any lingering oils. After using the vinegar solution, rinse again with distilled water and dry completely. If the unusual odour continues despite these cleaning steps, it might indicate a problem with the internal components or an oil contamination issue, which would require professional attention.
The unit has become excessively hot
If your aromatherapy diffuser is generating excessive heat, this can signify several issues, most of which relate to airflow restrictions or motor malfunctions. Ensure the unit is placed on a stable, level surface away from flammable materials and direct sunlight. Check that nothing is obstructing the air intake vents – dust, debris or small objects could be restricting airflow and causing overheating. Gently clean the air inlet and outlet ports with a soft brush or dry cloth to remove any blockages. If your diffuser utilises ultrasonic vibration, it’s possible that mineral deposits from hard water are building up inside the reservoir and generating heat. Try refilling the water tank with distilled or filtered water to eliminate this possibility. Overheating can also be caused by using too much essential oil, which increases the energy needed for diffusion. Limit the amount of oil used according to the manufacturer’s instructions. If the diffuser continues to overheat despite these measures, it could indicate a problem with its internal motor or mechanism – do not attempt any repairs yourself. Contact the manufacturer or a qualified electrician immediately.
The diffuser won't turn off automatically
Some diffusers are designed to automatically shut down after a set period, but if yours isn’t working correctly, it can be frustrating. The most likely cause is that the timer function has been accidentally adjusted or is malfunctioning. Refer to the manufacturer’s instructions for details on how to operate the timer settings. Ensure the timer is set to your desired duration before starting the diffuser. If you suspect a malfunction with the timer itself, try resetting the unit – consult the manufacturer's instructions for the specific reset procedure. If these steps don't resolve the issue, there may be an internal electrical fault within the unit. Do not attempt any repairs yourself; this could pose a safety risk. Contact the manufacturer or a qualified electrician for assistance.