Question 1

i can't get the dust cup back into my shark vacuum, it won't click in place

Accepted Answer

DIAGNOSIS The Shark Navigator Lift-Away NV352 uses a friction-fit locking mechanism combined with a spring-loaded plastic latch. When the dust cup refuses to click back into place, it is almost always due to a physical obstruction in the "guide rails" or a misalignment of the locking tab. Because the NV352 is a high-suction unit, small pieces of hard debris—such as pebbles, plastic fragments, or pet kibble—often migrate into the narrow gap between the cup's outer wall and the vacuum's main chassis. If a piece of debris is lodged in the bottom cavity, the cup will sit approximately 1/4 to 1/2 inch too high, preventing the locking tab from reaching the engagement point. You can confirm this by attempting to slide the cup in and feeling a "hard stop" before the click. If the cup wobbles but won't lock, the issue is likely a bent or jammed latch. If the cup feels completely blocked from entering the slot, there is a foreign object lodged in the lower guide track. FIX Follow these precise steps to clear the mechanism and reseat the dust cup: Remove the dust cup entirely and take it to a well-lit area. Turn the cup upside down and shake it vigorously to ensure no hidden debris is rattling inside the rim. Inspect the gray plastic locking tab at the bottom of the cup. Ensure the tab is not bent outward or snapped. If it is stuck in the "locked" position, gently press it with your thumb to ensure it springs back. Use a flashlight to inspect the interior cavity of the vacuum body where the cup resides. Look specifically at the very bottom of the channel. Use a pair of needle-nose pliers or a vacuum hose (from a different machine) to remove any clumps of hair, dust bunnies, or hard debris lodged in the corners. Clean the vertical guide rails on both the vacuum body and the sides of the dust cup using a damp microfiber cloth. Built-up grime in these channels can create enough friction to prevent the cup from sliding deep enough to click. Insert the cup at a slight 15-degree angle, tilting the top toward the handle and the bottom slightly away, then push firmly straight down. You should hear a distinct, audible "click" when the latch engages. IF THAT DIDN'T WORK Check the Gasket Seal: Inspect the rubber gasket surrounding the top of the dust cup. If the gasket has become pinched or folded inward, it creates an air-tight seal too early, pushing the cup back out of the locking mechanism. Gently pull the rubber seal outward with your fingers to ensure it is flush against the plastic rim. Inspect for Warping: If the vacuum was stored in a very hot garage or dropped, the plastic chassis may have slightly warped. Try applying downward pressure on the top of the cup while simultaneously pushing the locking tab manually with a small screwdriver to see if it catches. Clear the Intake Port: Check the large opening where the dust cup connects to the motor housing. If a large object (like a coin or a LEGO brick) is lodged in the intake port, it will prevent the cup from seating fully. Use a coat hanger with a small hook on the end to fish out any obstructions. Lubricate the Latch: If the plastic latch is sticking due to fine dust buildup, apply a tiny amount of dry silicone spray to the locking tab. Avoid using WD-40 or oil-based lubricants, as these will attract more dust and eventually seize the mechanism. HEADS UP Never force the cup into place with excessive pressure; if it doesn't click with a firm push, forcing it can snap the plastic locking tabs, requiring a full replacement of the dust cup assembly. Empty the dust cup when it reaches the "MAX" fill line. Overfilling causes debris to be pushed into the locking mechanism and the intake port, leading to this exact seating issue. Periodically wipe down the guide rails with a dry cloth to prevent the accumulation of "static cling" dust, which can make the cup feel sticky or difficult to remove. Ensure the Lift-Away detachable pod is fully clicked into the main chassis before attempting to seat the dust cup, as a loose pod can shift the alignment of the cup's docking station.

Question 2

the hose attachment keeps popping off the back of my shark navigator when i'm using it

Accepted Answer

DIAGNOSIS The Shark Navigator Lift-Away NV352 utilizes a friction-fit locking mechanism consisting of two molded plastic tabs on the hose cuff that snap into corresponding slots on the vacuum's intake port. When the hose pops off during use, it is typically caused by "tab fatigue," where the plastic tabs have worn down or developed hairline fractures, preventing them from maintaining a secure mechanical lock against the chassis. This issue is often exacerbated by the "Lift-Away" design; as you pull the canister away from the main body, the hose is subjected to tension and torque. If the locking tabs are slightly compromised, the tension from pulling the hose during cleaning creates enough leverage to overcome the remaining friction, causing the cuff to eject. You can confirm this by attempting to plug the hose in and gently tugging on it; if you hear a clicking sound or feel a "slip" without a firm snap, the locking lugs are failing. Additionally, a buildup of compressed lint or hair inside the intake port can prevent the hose from seating deeply enough for the tabs to engage fully. FIX To resolve the connection failure and secure the hose, follow these precise steps: Power down the unit and unplug it from the wall to ensure safety during inspection. Remove the hose entirely and use a flashlight to inspect the interior of the intake port on the back of the vacuum body. Use a vacuum-thin pipe cleaner or a twisted zip-tie to clear out any compacted debris or "dust cakes" that may be blocking the seating depth. Examine the two plastic locking tabs on the hose cuff. If they are bent slightly outward, use a pair of needle-nose pliers to gently press them inward by approximately 1-2 millimeters to increase the tension when they snap into the port. Clean the outer rim of the intake port with a damp cloth to remove any slippery dust residue that could be reducing the friction hold. Insert the hose into the port with a firm, linear push. Do not angle the hose; push straight in until you hear a distinct, audible "click." Perform a "tug test" by pulling the hose firmly toward you. If it remains seated, the connection is restored. IF THAT DIDN'T WORK Apply a Rubber Grip Shim: If the tabs are worn but not broken, cut a small strip of thin rubber band or a piece of electrical tape and wrap it tightly around the male end of the hose cuff (the part that inserts into the vacuum). This increases the diameter of the connection, creating a tighter friction fit that compensates for the worn plastic. Replace the Hose Assembly: If the plastic tabs are snapped off entirely, the cuff cannot be repaired. You will need to replace the entire hose assembly. Look for the NV352-specific replacement hose to ensure the cuff diameter matches the port exactly, as hoses from other Navigator series may look similar but have slightly different locking tab placements. Check for Chassis Cracks: Inspect the plastic housing around the intake port. If the vacuum has been dropped, the port may have a hairline crack that allows the walls to spread apart when the hose is inserted. If the port is cracked, a small amount of two-part epoxy applied to the exterior of the port housing can reinforce the structure and prevent the "spreading" that allows the hose to pop out. Adjust Your Cleaning Technique: If the hose is popping off only when using the Lift-Away canister, ensure you are not over-extending the hose. Keep the canister within 3-5 feet of the vacuum head to reduce the tension pulling directly against the locking tabs. HEADS UP Avoid pulling the vacuum by the hose; always pull by the handle or the canister to prevent putting undue stress on the plastic locking tabs. Periodically check the hose for small punctures or tears; a leak in the hose reduces suction, which can actually cause the motor to run hotter and potentially warp the plastic components over time. When inserting the hose, ensure it is pushed in completely. A "partial" click is the most common reason for the hose popping off during the first few minutes of use. Store the hose in a loose loop rather than a tight coil to prevent the plastic from developing permanent creases that can weaken the cuff connection.

Question 3

my shark vacuum smells terrible like burning dust every time i use it

Accepted Answer

DIAGNOSIS The "burning dust" or singed metallic odor in the Shark Navigator Lift-Away NV352 is almost always caused by restricted airflow forcing the motor to run at higher temperatures than designed. When the HEPA filter or the pre-motor foam filters become saturated with microscopic particulates, the vacuum can no longer expel air efficiently. This creates a heat-soak effect where the air passing through the motor housing becomes superheated, literally "cooking" the accumulated dust trapped in the filter pleats and the motor windings. You can confirm this by checking the suction at the nozzle. If the vacuum sounds higher-pitched than usual (a "whining" sound) and the air coming out of the exhaust feels abnormally hot to the touch, your filters are clogged. In some cases, the smell is exacerbated by a blockage in the hose or the brush roll, which causes the motor to overwork and overheat the internal components, leading to that distinct ozone or burning dust scent. FIX Follow these exact steps to deep-clean the filtration system and eliminate the odor: Clear the Dust Cup: Press the release button to empty the dust bin. Use a damp cloth to wipe the interior walls of the plastic canister to remove clinging fine dust that often bypasses the filters. Clean Pre-Motor Foam Filters: Locate the two foam filters (one inside the dust cup assembly and one near the motor). Remove them and wash them with warm, soapy water. Squeeze them gently—do not wring or twist—until they are clean. Let them air dry for a full 24 hours. Installing damp foam filters will create a musty smell and can damage the motor. Replace the HEPA Filter: Locate the large, round HEPA filter housing at the top of the unit. Twist the cover counter-clockwise to unlock it and pull the filter out. Unlike the foam filters, the HEPA filter is not washable. If it is grey or brown, it must be replaced. Tap it firmly against the side of a trash can to remove loose debris, but if the smell persists, install a new replacement filter. Clear the Brush Roll: Flip the vacuum over and check the brush roll for tangled hair or string. Use scissors to cut away debris. A jammed brush roll puts immense strain on the motor, contributing to the overheating and burning smell. Inspect the Hose: Detach the hose from the main body. Drop a coin or a small ball through the hose to ensure there are no obstructions. A partial clog here forces the motor to pull harder, increasing internal heat. IF THAT DIDN'T WORK Check for Belt Friction: If the smell is more like burning rubber than burning dust, the drive belt may be slipping or frayed. Remove the bottom plate and inspect the belt for thinning or melted spots. If the belt is slipping, the friction generates intense heat that smells like burning plastic. Deep Clean the Exhaust Port: Use a can of compressed air to blow out the motor vents. Sometimes dust bypasses the filters and settles directly on the motor housing; blowing this out prevents the "singed" smell from recurring. Inspect the Power Head: Check the "Brushroll" indicator light. If it is flashing or red, the motor is detecting an overload. This electrical strain can cause the internal wiring to heat up, producing a metallic burning scent. Perform a "Hard Reset": Unplug the unit and leave it disconnected for 30 minutes to allow the thermal fuse and motor windings to cool completely to room temperature before attempting another run. HEADS UP Never wash the HEPA filter: Water destroys the electrostatic charge and the structural integrity of the HEPA pleats, rendering the filter useless and potentially allowing dust to enter the motor. Filter Schedule: Replace the HEPA filter every 6 months and wash the foam filters every 2 weeks if you have pets or high-pile carpeting. Avoid "Over-filling": Empty the dust cup when it is 70% full. Waiting until it is packed to the brim significantly restricts airflow and accelerates motor overheating. Scent Warning: Do not add fragrance oils or powders to the filters to mask the smell, as these can clog the pores of the HEPA material and lead to permanent motor damage.

Question 4

the canister part of my lift-away won't stay upright, it keeps tipping over when i'm using the hose

Accepted Answer

DIAGNOSIS The tipping issue with the Shark Navigator Lift-Away NV352 canister is typically caused by a failure in the center of gravity shift during the "Lift-Away" mode transition. When the canister is detached from the floor nozzle, it relies on a specific weight distribution and the friction of the rubberized base to remain stable. If the canister tips over while you are pulling the hose, it is usually because the hose is being pulled at an acute angle that exceeds the base's tipping point, or the internal dust bin is empty, making the unit top-heavy relative to the pull force. Another common root cause is the degradation or accumulation of debris on the bottom plastic housing. Over time, fine dust and hair wrap around the base or embed into the plastic, reducing the grip between the canister and the floor surface. This allows the unit to slide slightly before tipping. You can confirm this by placing the canister on a high-friction surface like a rug; if it stays upright there but tips on hardwood or tile, the issue is surface friction and pull-angle dynamics. FIX To stabilize the NV352 canister and prevent it from tipping during hose operation, follow these precise steps to optimize the unit's balance and grip: Clear the Base: Turn the canister upside down. Use a damp microfiber cloth and a mild detergent to scrub the bottom perimeter of the plastic housing. Remove all embedded grit, hair, and sticky residue that may be acting as a lubricant between the vacuum and the floor. Optimize Bin Loading: If you are vacuuming a large area with an empty bin, the unit is more prone to tipping. Ensure the dust cup is seated firmly by pressing down until you hear a distinct click. If the bin is completely empty, the center of gravity is higher; avoid pulling the hose at angles greater than 45 degrees from the unit. Adjust the Hose Exit Point: Ensure the hose is fully clicked into the port. If the hose is partially disengaged, it creates a lever effect that pulls the canister over more easily. Push the hose connector in until it locks completely. Strategic Positioning: Place the canister against a wall or in a corner when using the hose for extended periods. This provides a physical stop that prevents the unit from tipping backward or sideways. Check the Lift-Away Latch: Ensure the release button is fully engaged and the canister is not "half-detached," which can cause an uneven weight distribution when the hose is extended. IF THAT DIDN'T WORK Add Weighted Stability: If you frequently use the NV352 on slick tile or polished hardwood, you can apply small, adhesive-backed rubber bumper pads (clear silicone dots) to the four corners of the canister base. This increases the footprint's grip and provides a slight offset that resists tipping. Inspect the Hose for Kinks: A kinked or stiffened hose creates "spring-back" tension. If the hose has a permanent bend, it will pull the canister over even with a light touch. Gently warm the stiff section of the hose with a hairdryer on low heat to regain flexibility, reducing the tension exerted on the canister. Verify Bin Integrity: Inspect the dust bin for cracks or a warped chassis. If the bin is not sitting perfectly flush against the motor housing, the center of gravity shifts off-center, making the unit tip in one specific direction. Replace the dust cup if the plastic tabs are sheared off. Shorten the Pull Radius: Instead of pulling the canister across the room, move the canister closer to the area you are cleaning. The NV352 hose is designed for reach, but the further you extend it, the more leverage you have to accidentally pull the unit over. HEADS UP Avoid Overfilling: While an empty bin can be unstable, an overfilled bin (past the "Max Fill" line) can shift the weight too far forward, causing the unit to tip in the opposite direction during movement. Filter Maintenance: Always clean the pre-motor foam filter and felt filter every 30 days. A clogged filter increases motor strain and vibration, which can cause the canister to "walk" across smooth floors and eventually tip. Hose Care: Never pull the hose by the attachment tool with extreme force. This puts unnecessary stress on the canister's intake port and can eventually crack the plastic housing, leading to permanent instability. Surface Awareness: Be cautious when using the Lift-Away mode on high-pile carpets; the canister can sink into the fibers, creating a pivot point that makes tipping more likely when the hose is retracted.

Question 5

how do you get the wand off the shark lift-away? it's stuck and won't detach

Accepted Answer

DIAGNOSIS The Shark Navigator Lift-Away NV352 utilizes a spring-loaded locking pin mechanism to secure the extension wand to the main handle assembly. Over time, fine particulate matter—specifically gypsum dust from drywall, pet dander, and microscopic grit—migrates into the tight tolerances between the wand's male end and the handle's female receiver. When this debris compacts, it creates a "friction weld" effect, where the grit physically obstructs the release button from fully depressing the locking pin into the handle housing. Furthermore, if the vacuum was used to pick up moisture or damp debris, the dust can turn into a hardened paste that effectively glues the plastic components together. If you feel the release button moving but the wand remains immobile, the internal spring has likely lost its tension or the locking pin is jammed in the "engaged" position due to debris buildup inside the handle's internal sleeve. This is a common mechanical failure point on the NV352 series and usually does not indicate a broken part, but rather a contaminated interface that requires mechanical agitation to resolve. FIX To safely detach the stuck wand without snapping the ABS plastic housing of the NV352, follow these precise steps: The Pressure-Twist Method: Firmly depress the release button on the handle. While holding the button down completely, do not pull straight back. Instead, rotate the wand clockwise and counter-clockwise in 45-degree increments. This "wiggling" action breaks the surface tension of the packed debris and allows the locking pin to slide. The Leveraged Pull: While keeping the release button fully depressed, grip the wand approximately 3 inches below the connection point. Apply a firm, steady outward pull while continuing to rotate the wand. Avoid jerking the wand, as this can shear the plastic locking tab. The Percussive Shock: If the wand remains seated, take the unit to a hard surface. With the release button held down, use the handle of a heavy screwdriver or a rubber mallet to deliver light, rapid taps to the side of the handle assembly (exactly where the wand enters the receiver). The vibrations often shake the locking pin loose from the grit. Lubricant Application: If the button feels "mushy" or doesn't click, apply a small amount of 70% isopropyl alcohol or a silicone-based lubricant around the seam where the wand meets the handle. Let it sit for 5 minutes to penetrate the grit before attempting the twist-and-pull method again. IF THAT DIDN'T WORK If the wand is still fused to the unit, try these advanced recovery options: Compressed Air Blast: Use a can of compressed air (duster) to blow high-pressure air directly into the gap between the wand and the handle. This can sometimes displace the grit that is physically jamming the locking pin from the inside. The Temperature Shock: Use a hairdryer on a low-heat setting to warm the plastic handle for 60 seconds. The heat causes the plastic handle to expand slightly more than the wand, which can create a microscopic gap sufficient to release the locking pin. Manual Pin Manipulation: If you can see the edge of the locking pin through the gap, use a thin sewing needle or a precision dental pick to manually push the pin back into the handle while simultaneously pulling the wand. Handle Disassembly: As a last resort, remove the screws securing the handle to the main body of the NV352. This allows you to push the wand out from the inside of the chassis using a wooden dowel rather than pulling from the outside. HEADS UP Avoid Brute Force: Never use a pry bar or heavy pliers to force the wand out; the NV352 handle is made of ABS plastic and will crack easily, requiring a full replacement of the handle assembly. Check the O-Ring: Once the wand is removed, inspect the end for any worn-out rubber seals or accumulated "caked" dirt. Wipe the connection point with a damp cloth to prevent future jams. Dry Only: Never use WD-40 or heavy petroleum-based oils to lubricate the connection, as these attract more dust and will eventually create a thicker, harder sludge that permanently jams the mechanism. Button Inspection: If the release button does not "spring back" after being pressed, the internal spring has failed or snapped, and you will need to replace the handle unit entirely.

Question 6

why is my shark navigator losing suction almost immediately after i start vacuuming?

Accepted Answer

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Question 7

the brushroll on my shark lift-away isn't spinning, it just makes a humming noise

Accepted Answer

DIAGNOSIS The humming sound you hear is the motor attempting to engage, but the brushroll is physically seized. In the Shark Navigator NV352, the brushroll is driven by a belt connected to a motor; when you hear a hum without rotation, the motor is spinning, but the brushroll itself is locked in place. This is almost always caused by "winding," where long hairs, carpet fibers, and sewing threads wrap around the ends of the roller, creating a tight knot that acts like a clamp on the bearings. Another possibility is a snapped drive belt. If the belt has perished or slipped off the pulley, the motor will spin freely (creating a high-pitched hum), but no torque is transferred to the brushroll. To confirm the cause, check the brushroll manually: if it won't budge even with a firm push, it is a jam. If it spins loosely with zero resistance, the belt has likely snapped or detached. FIX Follow these steps to clear the jam and restore rotation: Power down the unit and remove the battery or unplug it from the wall to avoid accidental activation. Lay the vacuum flat on its back on a hard surface. Locate the brushroll access plate on the bottom of the nozzle. Use a quarter or a similar coin to rotate the two locking tabs (located on the left and right) to the "Unlock" position. Lift the silver plate away and set it aside. Grasp the brushroll and pull it straight out of the housing. If it is stuck, gently wiggle it side-to-side while pulling. Use a pair of heavy-duty sewing scissors or a seam ripper to cut through the hair and string wrapped around the brushroll. Focus specifically on the ends of the roller where the debris bunches up against the plastic end caps. Once the hair is cut, peel the debris away from the roller. Ensure the grooves of the brushroll are completely clear. Inspect the drive belt (the rubber band connecting the motor to the roller). If it is intact, ensure it is seated correctly in the pulley groove. Slide the brushroll back into the housing, ensuring it clicks fully into the drive gear. Replace the silver plate and lock the tabs back into the "Lock" position using your coin. IF THAT DIDN'T WORK Replace the Drive Belt: If the brushroll spins freely by hand but won't move when powered on, the belt has likely snapped. Purchase a replacement belt compatible with the NV352 series. You will need to remove the bottom plate and the brushroll, then loop the new belt around the motor spindle and the brushroll axle, ensuring there is proper tension. Clear the Airway Obstruction: Sometimes a large object (like a coin or a pebble) gets wedged between the brushroll and the plastic housing, preventing rotation. Use a flashlight to look inside the nozzle housing for any foreign objects that might be pinning the roller against the ceiling of the vacuum head. Check the Brushroll Reset Switch: The NV352 has a built-in electronic protection system. If the motor detects too much resistance, it may "trip" the circuit. Ensure the vacuum is completely off for 60 seconds to let the thermal protector reset before attempting to power it on again. Inspect the Bearings: If the brushroll is clean but still feels "gritty" or hard to turn, the internal bearings may have worn out or collected fine dust. While the brushroll is out, try spinning the axle. If it doesn't spin smoothly, the entire brushroll assembly needs to be replaced. HEADS UP Avoid Wet Debris: Never vacuum up damp carpets or liquid spills. Moisture causes hair and dust to "cement" to the brushroll axle, which leads to permanent bearing failure. Regular Maintenance: To prevent future jams, clear the brushroll every two weeks if you have pets or long-haired residents in the home. Avoid Over-tightening: When locking the silver plate back in, do not over-torque the tabs; they are plastic and can strip if you use too much force with the coin. Check the Belt Tension: If you replace the belt, ensure it is not twisted. A twisted belt will cause the vacuum to vibrate excessively and will snap much faster than a correctly installed one.

Question 8

my shark navigator just stops working and the power button light is blinking red, what does that mean?

Accepted Answer

DIAGNOSIS The blinking red light on the Shark Navigator Lift-Away NV352 is a visual indicator that the motor has triggered its thermal overload protection circuit. This is a safety mechanism designed to prevent the permanent burnout of the motor when it detects excessive heat or an abnormal spike in electrical resistance. Essentially, the motor is working too hard to pull air through a restricted path, causing the internal temperature to reach a critical threshold. This usually occurs due to a "choke point" in the airflow. When the vacuum cannot move air efficiently, the motor loses the cooling airflow it needs to operate, leading to rapid overheating. You can confirm this is a thermal issue if the vacuum was working normally for several minutes before suddenly cutting out, and if the plastic housing near the motor feels hot to the touch. Common culprits include a packed dust bin, a clogged pre-motor foam filter, or a physical obstruction (like a clump of carpet fibers or a stray sock) lodged in the hose or the brushroll assembly. FIX To reset the thermal protector and clear the blockage, follow these precise steps: Immediately press the power button to the "Off" position and disconnect the power cord from the wall outlet. Do not attempt to restart the vacuum for at least 30 to 60 minutes to allow the internal thermal switch to cool and reset. Press the release button on the dust cup and empty the debris completely. Do not just empty it halfway; ensure the bin is totally clear. Remove the dust cup and locate the pre-motor foam filter and the post-motor felt filter. Wash the foam filter with warm, soapy water, rinse thoroughly, and let it air dry for 24 hours. If the filter is gray or blackened, it is restricting airflow and must be replaced. Detach the hose from the main body. Drop a heavy coin or a small ball through the hose to see if it passes through freely. If it gets stuck, use a broom handle or a flexible plumbing snake to push the clog out from the bottom. Flip the vacuum over and remove the brushroll. Check for tangled hair or string wrapped around the agitator. Use a pair of scissors to cut the debris away from the brushroll ends, specifically around the bearing housing where friction often builds up. Reassemble all components, ensure the filters are bone-dry, and plug the unit back in to test. IF THAT DIDN'T WORK Check the "Lift-Away" connection points. If the canister is not seated perfectly into the main chassis, the airflow seal may be broken, causing the motor to strain. Ensure you hear a distinct "click" when locking the canister back into the base. Inspect the bottom nozzle for a "hidden" clog. There is often a buildup of debris right where the hose connects to the floor head. Use a flashlight to look into the intake port and clear any compacted dust with a long screwdriver. Test the vacuum on a different circuit. If you are using a long extension cord, the motor may be experiencing a voltage drop, which can cause it to run hotter and trigger the thermal shutdown. Plug the NV352 directly into a wall outlet. Verify the brushroll belt integrity. If the belt has snapped or is slipping, the motor may sense the lack of resistance or an uneven load, which can occasionally trigger an electronic fault. If the brushroll isn't spinning while the motor is humming, replace the belt (Part #NV352-B). HEADS UP Never operate the vacuum with damp filters. Using a wet foam filter blocks airflow almost entirely and will trigger the red blinking light within seconds of startup. Avoid using the vacuum on high-pile shag rugs for extended periods, as this increases the load on the brushroll motor and accelerates overheating. Perform a "Deep Clean" of the filters every 30 days to maintain the motor's lifespan and prevent thermal shutdowns. If the red light persists even after a 2-hour cool-down and a total clear of all clogs, the thermal fuse may have permanently blown, requiring a professional motor replacement.

Shark Navigator Lift-Away NV352

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