how do i clean the filter on this thing? the app says there's a maintenance alert.

Diagnosis

The "Maintenance Alert" in the MyDyson app and the flashing icon on the V15 Detect's LCD screen are triggered by the vacuum's internal pressure sensors. When the HEPA filter becomes saturated with microscopic dust and allergens, the air resistance increases. The motor detects this drop in airflow and triggers a blockage or filter alert to prevent the brushless motor from overheating and to ensure the "Detect" laser and piezo sensors can operate with maximum suction efficiency.

You can confirm the filter is the culprit if the vacuum "pulses" (starts and stops rapidly) or if the LCD screen explicitly displays a "Filter needs cleaning" message. Over time, fine particulates build up in the pleated fabric of the filter, creating a physical barrier that restricts the exhaust air, which eventually leads to a loss of suction power at the cleaner head.

How to Fix It

Follow these precise steps to deep-clean the V15 filter without damaging the HEPA material:

1. Power off the vacuum and remove the battery if you are performing a deep clean of the rest of the machine, though it is not required for the filter.
2. Locate the purple filter assembly at the rear of the motor head. Grip the filter housing and rotate it counter-clockwise (left) until it clicks and unlocks from the chassis. Pull the unit straight back to remove it.
3. Hold the filter under a cold water tap. Do not use soap, detergents, or bleach, as these can break down the electrostatic charge of the filter fibers.
4. Run water into the center of the filter and then around the outside. Gently squeeze the foam and fabric sections to push out trapped debris.
5. Cup your hand over the open end of the filter and shake it vigorously to dislodge any remaining clumps of dust.
6. Rinse until the water running through the filter is completely clear and no longer grey or brown.
7. Squeeze the filter firmly to remove excess water. Do not wring or twist the filter, as this can tear the internal pleated paper.
8. Place the filter in a well-ventilated area, ideally in front of a fan or in direct sunlight, for a minimum of 24 hours. The filter must be 100% bone-dry; if any moisture remains in the core, it will cause a musty smell or potentially damage the motor.
9. Once dry, align the filter with the motor head and twist clockwise until it locks firmly into place.

If That Didn't Work

• Check for Blockages: If the alert persists after cleaning the filter, there is likely a clog in the "U-bend" of the cleaner head or the wand. Remove the wand and look through the tube toward the light. Use a torch to check for clumps of hair or cardboard stuck in the narrowest part of the pipe.
• Clean the Flapper Valve: Inspect the red rubber seal (the flapper) where the bin connects to the main body. If dust has built up around this seal, it creates an air leak that the sensors interpret as a filter blockage. Wipe the seal with a damp microfiber cloth.
• Replace the Filter: HEPA filters have a finite lifespan. If you vacuum high-pile carpets or pet hair daily, the filter may have reached its maximum capacity and cannot be washed clean. Replace the unit with a genuine Dyson V15 filter (Part No: 969620-01) to restore full suction.
• Clear the Brush Bar: A tangled brush bar on the Fluffy Optic head can restrict airflow enough to trigger a maintenance alert. Use a coin or screwdriver to unlock the end cap of the cleaner head and remove any wrapped hair.

Heads Up

• Never Use a Dishwasher: Placing the filter in a dishwasher will warp the plastic housing and destroy the HEPA membrane, rendering the vacuum useless.
• Avoid the Dryer: Never put the filter in a tumble dryer or use a hairdryer on high heat, as this will shrink the foam and create gaps where dust can bypass the filter and enter the motor.
• Frequency: For optimal performance of the V15's piezo sensor, wash the filter once every month, regardless of whether the app triggers an alert.
• Dryness Warning: Installing a damp filter can lead to permanent mold growth inside the motor housing and may trigger a "Blockage" error that won't clear until the unit is professionally serviced.