Why Is My Dyson Vacuum Pulsing On and Off? (7 Fixes)

Dealing with a Dyson vacuum that keeps pulsing on and off can be incredibly frustrating. You're in the middle of cleaning, and instead of a steady suction, your vacuum starts behaving like it has a mind of its own. This is a surprisingly common issue among Dyson users, often reported across forums and review platforms. Whether it's a cordless or upright model, this pulsing problem can disrupt your cleaning routine and leave you wondering if your expensive vacuum is on its last legs.

The good news? This issue is often fixable at home without needing professional help. Common culprits include blockages, dirty filters, battery issues, or even a faulty power trigger. In this guide, we'll walk you through 7 actionable fixes, starting with the simplest checks and progressing to more involved troubleshooting. By the end, you'll either have your Dyson back to full power or know if it's time for an upgrade.

We'll also cover when to stop troubleshooting and consider a replacement, along with some top recommendations to avoid this headache in the future. Let's get started!

Common Causes

• Clogged filters blocking airflow
• Blockages in the hose or attachments
• Battery issues or insufficient charge (cordless models)
• Faulty trigger or power button
• Overheating due to prolonged use or poor ventilation

Troubleshooting Steps

1. Check for Full Charge (Cordless Models)

Difficulty: easy | Time: 5 minutes

If you're using a cordless Dyson, ensure the battery is fully charged. A low battery can cause the vacuum to pulse as it struggles to maintain power. Plug it into the charger for at least 3-4 hours (check your model’s manual for exact charging time). Once charged, test the vacuum. If it runs steadily without pulsing, the issue was simply a low battery. If it still pulses, move to the next step.

Warning: Don’t use the vacuum while it’s charging, as this can damage the battery or pose a safety risk.

2. Inspect and Clean the Filters

Difficulty: easy | Time: 10 minutes (plus drying time)

Dirty filters are a leading cause of pulsing in Dyson vacuums. Remove the pre-motor and post-motor filters (refer to your user manual for location). Wash them under cold water until the water runs clear, then let them air dry completely for 24 hours. Reinstall and test the vacuum. If suction is steady, the dirty filters were the culprit. If pulsing continues, the issue lies elsewhere.

Warning: Do not use wet filters, as this can damage the motor.

3. Check for Blockages in the Hose and Attachments

Difficulty: easy | Time: 10 minutes

A blockage in the hose, wand, or brush head can restrict airflow, causing the vacuum to pulse. Disconnect all attachments and visually inspect for debris like hair, dust, or small objects. Use a broom handle or a long, flexible tool to gently push out any blockages. Test the vacuum after clearing. Steady suction means the blockage was the issue. If pulsing persists, continue troubleshooting.

Warning: Be gentle to avoid damaging internal components.

4. Empty the Dust Bin

Difficulty: easy | Time: 5 minutes

An overfilled dust bin can reduce suction and cause pulsing. Empty the bin even if it doesn’t look full—compacted debris can still block airflow. Clean the bin with a dry cloth to remove dust buildup around the cyclone area. Reattach and test the vacuum. If it runs smoothly, the bin was the problem. If not, proceed to the next step.

5. Inspect the Brush Bar for Obstructions

Difficulty: medium | Time: 15 minutes

Hair, string, or debris wrapped around the brush bar can strain the motor, leading to pulsing. Turn off and unplug the vacuum, then remove the brush bar (check your manual for instructions). Cut away any tangled material with scissors and clean the bar. Reinstall and test. If the vacuum stops pulsing, this was the fix. If the issue remains, it might be a deeper problem.

Tools needed: Scissors, Small brush

6. Test for Overheating

Difficulty: easy | Time: 60 minutes (cooling time)

Dyson vacuums have safety features that shut off or pulse the motor if it overheats. If you’ve been using the vacuum for over 30 minutes, let it cool down for an hour. Ensure it’s in a well-ventilated area during use. After cooling, test it again. If it runs normally, overheating was the issue. If pulsing continues even after cooling, the problem might be internal.

Warning: Don’t ignore overheating, as it can permanently damage the motor.

7. Check the Trigger or Power Button

Difficulty: medium | Time: 10 minutes

A faulty trigger (on cordless models) or power button (on uprights) can cause intermittent power loss. Press and hold the trigger/button firmly while testing. If the vacuum runs steadily only with extra pressure, the mechanism might be wearing out. Contact Dyson support for a replacement part or repair quote. If this doesn’t help, the issue could be with the motor or battery, and professional help may be needed.

Warning: Do not attempt to disassemble the trigger assembly yourself, as this can void your warranty.

When to Upgrade

If you've gone through all the troubleshooting steps and your Dyson vacuum is still pulsing on and off, it might be time to consider an upgrade. Persistent pulsing, especially in models over 5 years old, often indicates internal motor or battery degradation that’s not worth the cost of repair. For instance, replacing a Dyson battery can cost $80-$150, and motor repairs can exceed $200—often close to the price of a new vacuum. If your model is out of warranty (typically 2-5 years for Dyson products), you’re likely on the hook for these expenses.

Additionally, if you notice other issues like frequent overheating, unusual noises, or a significant drop in suction even after cleaning, these are red flags that the vacuum is nearing the end of its lifespan. Safety is also a concern—electrical faults causing pulsing could pose a risk of short circuits. At this point, investing in a new vacuum with improved technology and reliability might save you time and frustration in the long run.

Before deciding, check Dyson’s website or contact support to confirm warranty status. If repairs are covered, that’s a better option. But if the cost outweighs the benefit or the vacuum is outdated, explore our upgrade recommendations below for models that address common Dyson issues like pulsing.

Upgrade Now

🛒 Buy Dyson V15 Detect Cordless Vacuum Cleaner on Amazon

🛒 Buy Shark AZ2002 Vertex Powered Lift-Away Upright Vacuum on Amazon

🛒 Buy Tineco Floor One S3 Cordless Hardwood Floors Cleaner on Amazon

Prevention Tips

• Clean filters monthly to maintain airflow and prevent motor strain.
• Empty the dust bin after every use to avoid blockages.
• Regularly check the brush bar for tangled hair or debris and clean as needed.
• Avoid overusing the vacuum in one session—take breaks to prevent overheating.
• Store the vacuum in a cool, dry place to protect the battery and motor.