Question 1

the timer function on my vu5670 doesn't turn the fan off when it's supposed to, it just keeps running.

Accepted Answer

DIAGNOSIS The Rowenta VU5670 Turbo Silence Stand Fan utilizes a digital timer circuit that controls a power relay. When the timer fails to shut off the fan, the issue is typically a "logic hang" in the control board or a failure of the mechanical relay to trip. In a logic hang, the internal countdown clock continues to run in the background, but the signal to open the circuit (cut the power) never reaches the relay. This is often caused by a voltage spike or a residual charge in the capacitors that prevents the microcontroller from resetting its state. To confirm this is a logic error rather than a mechanical failure, set the timer for the minimum increment (usually 30 minutes). If the fan continues to run past that window without any clicking sound coming from the base, the relay is not being triggered. If you hear a distinct "click" but the blades keep spinning, the relay contacts have likely welded shut, meaning the physical switch is stuck in the "on" position regardless of the timer's command. FIX Since the VU5670 does not have a dedicated "Reset" button, you must perform a hard power cycle to flush the volatile memory of the control board. Turn the fan off using the power button on the control panel. Physically disconnect the power cord from the wall outlet. Do not simply turn off the power strip or wall switch. Wait exactly 5 minutes. This duration is critical to allow the capacitors on the PCB (Printed Circuit Board) to fully discharge, which clears the corrupted timer state. While the unit is unplugged, press and hold the power button for 10 seconds to bleed off any remaining residual energy. Plug the unit back into a direct wall outlet, avoiding extension cords or surge protectors for this test to ensure consistent voltage. Power the fan on and set the timer to the shortest possible duration (30 minutes). Observe the timer display; if the countdown progresses and the unit shuts down at zero, the logic glitch has been resolved. IF THAT DIDN'T WORK Inspect for Control Panel Moisture: If the fan is used in a humid environment, condensation can build up behind the membrane buttons. Use a can of compressed air to blow out the gaps around the timer buttons. Debris or moisture in the tactile switches can send "phantom" signals to the board, effectively resetting the timer or overriding the shut-off command. Check for Voltage Fluctuations: If the fan is plugged into a heavily loaded power strip, "brownouts" or voltage drops can cause the digital timer to freeze while the motor continues to spin. Move the VU5670 to a dedicated 120V/230V wall socket to see if stable current restores timer functionality. Relay Contact Cleaning: If you are comfortable opening the base (and the unit is out of warranty), locate the rectangular black relay on the PCB. Use a plastic probe to gently tap the top of the relay while the timer is supposed to be triggering. If the fan shuts off upon impact, the relay is mechanically sticking and needs to be replaced (Part # varies by region, but it is a standard 12V/250V DC coil relay). Firmware Loop Reset: Try setting the timer to the maximum setting (typically 8 hours) and then immediately reducing it back down to 30 minutes. This sometimes forces the microcontroller to re-index the timer sequence and can break a software loop. HEADS UP Avoid using the timer function in conjunction with high-wattage space heaters on the same circuit, as the electromagnetic interference (EMI) can disrupt the VU5670's sensitive timer logic. Always ensure the fan base is on a completely level surface; extreme tilts can occasionally cause the internal relay to vibrate or fail to seat properly. Clean the motor housing with compressed air every six months; overheating in the motor can lead to erratic behavior in the control board due to heat soak. Never use a "smart plug" to override the fan's internal timer, as the sudden power cut can sometimes corrupt the VU5670's internal memory settings.

Question 2

how do i reset this fan? it's acting weird and none of the buttons are responding right.

Accepted Answer

DIAGNOSIS The Rowenta VU5670 Turbo Silence Stand Fan utilizes a digital control board (microcontroller) to manage its variable speed settings, timer functions, and remote receiver. When the buttons become unresponsive or the fan behaves erratically—such as cycling through speeds on its own or ignoring the remote—it is typically due to a "logic lock." This occurs when the internal capacitors hold a residual charge that maintains a corrupted state in the volatile memory of the control board, often triggered by a minor power surge or a brownout in your home's electrical circuit. To confirm this is a logic error rather than a mechanical failure, observe the LED indicator lights on the control panel. If the lights are illuminated but the motor isn't spinning, or if the lights flash rapidly when you press a button but no action occurs, the board is likely frozen. If there are no lights at all, you are dealing with a power delivery issue (blown fuse or severed cord) rather than a software glitch that requires a reset. FIX Because the VU5670 does not feature a physical "Reset" pinhole, you must perform a hard power cycle to clear the capacitors and force the microcontroller to reboot from a clean state. Follow these exact steps: Power down the unit using the main power button and then physically unplug the power cord from the wall outlet. Do not use a power strip or surge protector for this process; unplug directly from the wall. Leave the fan unplugged for a minimum of 5 to 10 minutes. A quick 10-second unplug is often insufficient to drain the electrolytic capacitors on the VU5670's board, which can keep the "glitch" alive in the memory. While the unit is still unplugged, press and hold the Power button and the Speed selection button simultaneously for 15 seconds. This manually bleeds any remaining voltage from the circuit. Inspect the remote control. Remove the batteries and press every button on the remote once to ensure no buttons are physically stuck in the "down" position, which would send a continuous signal and override the manual panel. Plug the fan back into a known-working wall outlet (avoid using an extension cord for the initial test). Press the Power button once. The fan should initialize in its default low-speed mode. IF THAT DIDN'T WORK Check for "Child Lock" or Timer Interference: Ensure the timer dial hasn't been bumped into a position that is restricting operation. If the timer is set to a specific interval, the fan may shut off unexpectedly, mimicking a malfunction. Rotate the timer dial fully to the "Off" position and then back to "Manual" or "Continuous" to clear any mechanical hang-ups. Remote Signal Interference: The VU5670 uses infrared (IR) signals. If you have high-intensity LED lighting or a direct sunlight source hitting the fan's receiver, it can create "ghost inputs." Turn off nearby bright lights and try operating the fan solely via the physical buttons on the chassis to see if the responsiveness returns. Inspect the Capacitor Bank: If the fan hums but doesn't spin, or if the reset didn't work, the start/run capacitor (usually a CBB61 type) may have failed. This isn't a software reset issue but a hardware failure. If you are comfortable with a multimeter, check for capacitance across the motor terminals; a reading significantly below the rated microfarads (µF) indicates the part needs replacement. Clean the Control Panel Contacts: Dust and humidity can create a conductive film over the tactile switches on the control panel. Use a canister of compressed air to blow out the gaps around the buttons, or apply a small amount of electronic contact cleaner (like DeoxIT) to the edges of the buttons to ensure the physical connection is being made. HEADS UP Avoid Power Strips: The Turbo Silence series draws a significant burst of current during the initial motor start. Using low-quality power strips can cause voltage drops that lead to the very microcontroller glitches described above. Battery Maintenance: Always use high-quality alkaline batteries in the remote. Low voltage in the remote can send "noisy" signals to the fan, causing it to jump speeds or ignore commands. Dust Accumulation: Vacuum the rear grill every two weeks. If the motor overheats due to dust blockage, the thermal fuse may trip, which looks like an unresponsive control board but is actually a safety shutdown. Voltage Stability: If your home experiences frequent flickering lights, consider a dedicated voltage regulator for your electronics to prevent the VU5670's logic board from corrupting again.

Question 3

my fan turns on but only works on the lowest speed setting, the higher speeds do nothing.

Accepted Answer

DIAGNOSIS The Rowenta VU5670 Turbo Silence Stand Fan utilizes a multi-stage electronic speed control system. When the fan operates exclusively on the lowest speed setting and ignores inputs for medium or high, the root cause is typically a failure in the switching circuit on the main printed circuit board (PCB) located in the base. Specifically, the triacs or capacitors responsible for modulating the voltage to the motor have failed. In this model, the low speed often bypasses certain control stages or uses a different capacitor path, which is why it remains functional while the higher-draw settings fail. This failure is often caused by voltage spikes or overheating of the control components during prolonged high-speed operation. To confirm this, you can perform a "button continuity test" if you have a multimeter. If the buttons register a press but the motor doesn't ramp up, the issue is not the physical switch but the power-delivery components on the board. Look for a "burnt" smell emanating from the base or a slight discoloration (browning) on the green PCB surface near the power input area. FIX To resolve this, you must access the internal control board and perform a component-level repair or replace the PCB. Follow these steps precisely: Power Isolation: Unplug the fan from the wall outlet. Do not attempt this while the unit is connected to power, as the capacitors on the board can hold a lethal charge. Base Disassembly: Turn the fan upside down. Remove the four Phillips head screws securing the bottom plastic plate of the base. Carefully lift the plate to reveal the main PCB and the wiring harness. Visual Inspection: Examine the board for "bulging" electrolytic capacitors (the tops should be flat, not domed). Look for scorched areas around the triacs—these are the small three-legged components that handle the high-current switching. Solder Joint Refresh: Use a soldering iron to reflow any "cold" or cracked solder joints, particularly where the main power cord enters the board and where the motor wires connect. Cracked joints often cause high-resistance paths that prevent the motor from reaching high speeds. Component Replacement: If a capacitor is bulging, identify its rating (e.g., 10uF 25V) and replace it with an identical specification part. If a triac is burnt, it must be desoldered and replaced with a compatible semiconductor. Testing: Before closing the base, ensure all wires are tucked away from the edges of the plastic housing to prevent pinching. Reassemble the base and test the speed cycles. IF THAT DIDN'T WORK Motor Capacitor Replacement: The VU5670 relies on a start/run capacitor located near the motor housing. If this capacitor has degraded, the motor may have enough torque to spin at low speed but lack the electrical "push" to accelerate to higher RPMs. Replace the motor capacitor with a new one matching the exact microfarad (uF) rating. Control Panel Ribbon Cable: Check the thin ribbon cable connecting the buttons to the main PCB. If the cable is pinched or has a hairline fracture, the signals for "Medium" and "High" may not be reaching the controller. Clean the contacts with 90% isopropyl alcohol and reseat the connector. Motor Bearing Friction: If the bearings are seized or dry, the motor may be physically unable to reach higher speeds due to mechanical resistance. Spin the blades by hand; if they feel stiff or "gritty," apply a drop of high-grade synthetic machine oil to the motor shaft. Full PCB Replacement: If multiple components on the board are scorched, a board-level repair is impractical. Source a replacement VU5670 control board and swap the entire unit, ensuring the wiring harness is seated firmly. HEADS UP Voltage Warning: Always discharge the capacitors using a resistor before touching the PCB to avoid electrical shock. Avoid Overloading: Do not run the fan on the "Turbo" setting for more than 12 consecutive hours, as this puts maximum stress on the control triacs. Dust Maintenance: Every 3 months, use compressed air to blow out the motor vents in the rear of the fan head. Dust buildup causes the motor to run hotter, which degrades the electronic components in the base. Power Surge Protection: Plug your Rowenta fan into a high-quality surge protector. The electronic speed controllers in these models are highly sensitive to grid fluctuations.

Question 4

the remote for my rowenta fan just doesn't work anymore. new batteries didn't fix it.

Accepted Answer

DIAGNOSIS The failure of the Rowenta VU5670 Turbo Silence remote is rarely a battery issue once you have swapped them for fresh alkaline cells. This model utilizes a basic Infrared (IR) communication system. The most common failure point is the IR receiver diode located behind the translucent plastic window on the front of the control panel. Over time, fine household dust and oils accumulate on this window, creating an opaque barrier that scatters the IR signal, preventing the receiver from "seeing" the remote's commands. If cleaning the exterior doesn't work, the issue is typically a "cold solder joint" or a failed capacitor on the main PCB (Printed Circuit Board) located in the base. Because the VU5670 is a high-velocity fan, the vibrations from the motor can eventually loosen the solder connections on the IR receiver pins. You can confirm if the remote itself is dead by using the "Camera Test": point the remote at your smartphone's front-facing camera and press a button. If you see a flickering purple/blue light through the screen, the remote is transmitting and the fault lies entirely within the fan's receiver hardware. FIX To resolve this, follow these steps to clean and reset the receiver system: Disconnect the fan from the wall outlet completely to avoid any electrical shorts during cleaning. Locate the IR receiver window—the small, dark, rectangular plastic strip on the front of the control panel. Use a microfiber cloth dampened with 70% isopropyl alcohol to thoroughly scrub the window. Ensure no streaks or residue remain. Use a can of compressed air to blow out the gaps around the control panel buttons. Debris trapped in these crevices can sometimes interfere with the receiver's sensitivity. Perform a hard hardware reset: Unplug the unit and hold down the physical "Power" button on the fan base for 15 seconds. Plug the unit back in and attempt to operate the remote from a distance of 2 feet before moving back to a normal distance. If you are comfortable with basic electronics, unscrew the base plate using a Phillips #2 screwdriver. Locate the IR receiver (a small 3-pin component). Use a soldering iron to gently reflow the solder on those three pins to ensure a solid connection to the PCB. IF THAT DIDN'T WORK Replace the IR Receiver Module: If the camera test proves the remote is working but the fan remains unresponsive, the IR receiver diode has likely burned out. You can source a generic 38kHz IR receiver module (standard for most Rowenta fans) and solder it in place of the failed component. Check for Signal Interference: High-frequency electronics or strong LED lighting arrays placed directly in front of the fan can "flood" the IR sensor with noise. Move the fan 3 feet away from other electronic devices or fluorescent lamps to see if responsiveness returns. Remote Contact Cleaning: Open the remote battery compartment and use a cotton swab with alcohol to clean the metal contact springs. Even with new batteries, a thin layer of oxidation on the springs can prevent the remote from drawing enough voltage to send a strong signal. PCB Capacitor Check: Inspect the main board for "bulging" capacitors (cylindrical components with swollen tops). If a capacitor in the power regulation circuit has failed, the IR receiver may not be receiving the steady 5V required to operate. HEADS UP Avoid using window cleaner or ammonia-based products on the IR window, as these can etch the plastic and permanently blur the signal path. Always use high-quality alkaline batteries; avoid rechargeable NiMH batteries in the remote, as they provide 1.2V instead of 1.5V, which can lead to intermittent signal failure in Rowenta remotes. Do not spray compressed air directly into the control panel buttons for long periods, as this can push dust deeper into the tactile switches. If you solder the PCB, ensure you use 60/40 rosin-core solder to avoid bridging the small pins on the receiver module.

Question 5

can i take the whole thing apart to clean the inside of the motor housing? it's super dusty in there.

Accepted Answer

DIAGNOSIS The Rowenta VU5670 Turbo Silence is designed with a high-efficiency airflow system that utilizes internal acoustic dampening. This means the motor housing is lined with a specific sound-absorbing foam and tight tolerances to reduce decibels. Unfortunately, this design creates a "static trap" where fine particulate matter and household dust are sucked into the motor vents and cling to the foam and the motor's cooling fins. Over time, this dust buildup acts as an insulator, trapping heat within the motor windings. If you notice the fan smelling slightly "burnt" or if the motor housing feels excessively hot to the touch after an hour of operation, the dust has likely compromised the thermal dissipation. You can confirm this by shining a flashlight through the rear vents; if you see grey, felt-like clumps obstructing the airflow to the motor, a deep clean is mandatory to prevent the thermal fuse from blowing. FIX To perform a full deep clean of the motor housing, follow these precise steps. Ensure the unit is completely unplugged from the wall outlet before starting. Remove the Front Grille: Locate the perimeter clip or the locking screw at the bottom of the rim. Carefully unclip the front grille and set it aside. Detach the Fan Blade: In the center of the blade, there is a plastic spinner nut. Note that this is a reverse-thread; you must turn it clockwise (to the right) to loosen and remove it. Pull the blade assembly straight off the drive shaft. Remove the Rear Grille: Twist the rear grille counter-clockwise to unlock it from the motor housing. Open the Motor Housing: Locate the 4 to 6 Phillips-head screws securing the plastic motor shell. These are often recessed. Remove them and carefully pull the plastic cowling apart. Be cautious not to pinch the wires leading to the control panel. Clean the Internal Components: Do not use water inside the housing. Use a vacuum cleaner with a brush attachment to remove the bulk of the dust from the motor windings and the acoustic foam. For stubborn clumps, use a can of compressed air, spraying in short bursts from the center outward. Wipe the Shaft: Use a lint-free cloth dampened with a small amount of isopropyl alcohol to clean the motor shaft where the blade sits. This ensures a snug fit and prevents vibration. Reassemble: Snap the housing back together, tighten the screws, reinstall the rear grille, slide the blade onto the shaft, tighten the reverse-thread nut counter-clockwise, and snap the front grille back into place. IF THAT DIDN'T WORK Lubricate the Bearings: If the fan is noisy even after cleaning, the dust may have entered the bearing race. Apply two drops of high-grade sewing machine oil or synthetic lubricant (like 3-in-1) to the front and rear motor bearings. Do not use WD-40, as it is a solvent, not a long-term lubricant. Deep Clean the Acoustic Foam: If the foam lining is heavily soiled, you can carefully peel it back and use a vacuum with a crevice tool. If the foam has degraded or crumbled, avoid replacing it with standard sponge; it must be open-cell acoustic foam to maintain the "Silence" rating. Address Electrical Contact Dust: If the speed buttons are sticking, spray a small amount of electronic contact cleaner (like DeoxIT) into the switch assembly. This removes the conductive dust that can cause intermittent power failure. External Vent Clearing: If you cannot fully disassemble the shell, use a flexible duster or a vacuum nozzle on the highest setting specifically around the intake slits on the back of the motor housing to pull out "dust bunnies." HEADS UP Reverse Thread Warning: Always remember that the blade nut is reverse-threaded. Forcing it counter-clockwise to loosen will strip the plastic threads and permanently damage the assembly. Static Hazard: Avoid using overly synthetic cloths inside the motor housing, as this can create static discharge that may damage the control board. Overheating Risk: Never operate the fan without the motor housing installed, as the internal airflow is designed to cool the motor through the specific geometry of the shell. Maintenance Cycle: For the VU5670, a deep clean should be performed every 12 months if used in a dusty environment or a home with pets to ensure the motor lifespan is maximized.

Question 6

my fan is making a loud clicking or grinding noise, especially on the higher speeds.

Accepted Answer

DIAGNOSIS The loud clicking or grinding noise in the Rowenta VU5670 Turbo Silence Stand Fan is typically caused by mechanical interference or a failure in the motor bearing assembly. Because the noise intensifies at higher speeds, it indicates a centrifugal force issue: as the motor spins faster, the fan blade assembly experiences more vibration or "wobble," causing it to strike a nearby component. In many cases, the internal wiring harness that connects the base control panel to the motor housing has slipped out of its plastic retaining clip, allowing a wire to intermittently slap against the rotating blades. Alternatively, if the sound is a consistent grinding rather than a rhythmic click, the lubricant in the motor's sleeve bearings has likely dried out or become contaminated with household dust. This creates friction between the motor shaft and the bearing housing. You can confirm this by unplugging the unit and spinning the blades manually by hand; if you feel a "gritty" resistance or the blades stop abruptly rather than gliding to a slow halt, the issue is internal bearing wear. If the blades spin freely and silently by hand, the problem is almost certainly an external obstruction or a loose housing screw rubbing against the blade edge. FIX Follow these steps to isolate and resolve the mechanical interference: Disconnect the power cord from the wall outlet completely to prevent accidental activation. Remove the front safety grille. Grip the outer plastic ring of the grille and rotate it counter-clockwise to unlock the locking tabs. Carefully lift the grille away from the fan head. Inspect the perimeter of the fan blades. Look for any loose plastic shards from the housing or stray wires. Specifically, check the area where the motor housing meets the rear grille; ensure the wiring harness is tucked firmly into its designated routing channel. If a wire is loose, use a small zip-tie or a piece of electrical tape to secure the cable against the motor housing, ensuring there is at least a 2-inch clearance between the wire and the tip of the blades. Check the blade nut (the center cap holding the blades to the shaft). Use your fingers to see if it is loose. If it is, tighten it clockwise. A loose nut allows the blade assembly to shift off-center, causing it to clip the grille or housing at high RPMs. Clean the blade edges with a damp cloth to remove any heavy dust buildup, which can occasionally cause aerodynamic imbalance and vibration. Reinstall the front grille by aligning the tabs and rotating the outer ring clockwise until it clicks into place. IF THAT DIDN'T WORK Lubricate the Motor Shaft: If the grinding persists, the bearings need lubrication. Remove the motor housing cover (usually 4 Phillips head screws). Apply two drops of high-grade synthetic sewing machine oil or SAE 20 non-detergent oil to the front and rear of the motor shaft where it enters the bearing. Avoid using WD-40, as it is a solvent, not a long-term lubricant, and will eventually make the grinding worse. Tighten the Oscillation Gear: If the noise only occurs when the fan is oscillating, the plastic gears in the oscillation clutch may be stripped or dry. Open the motor housing and apply a small amount of white lithium grease to the oscillation gear teeth. Check for Blade Warping: Inspect the plastic blades for any hairline cracks or warping. If a blade has warped due to heat or impact, it will create an imbalance that causes the motor shaft to vibrate against the housing at high speeds. If the blades are warped, the entire blade assembly must be replaced. Inspect the Rear Grille Mounting: Ensure the rear grille is bolted tightly to the motor housing. If the mounting screws have vibrated loose, the grille can shift forward, causing the blades to graze the metal mesh during high-speed operation. HEADS UP Never operate the fan without the grilles installed, as the VU5670's high-torque motor can cause the blades to flex or shatter if they encounter an object. Avoid using aerosol lubricants like WD-40 on the motor shaft; these attract dust and grime, which turns into an abrasive paste that destroys the bearings. Perform a "dust-out" every three months using compressed air on the motor vents to prevent overheating and bearing degradation. Always ensure the blade nut is tightened firmly; a loose blade is the leading cause of catastrophic motor failure in stand fans.

Question 7

the oscillation on my vu5670 has gotten super slow and jerky, sometimes it just stops swinging.

Accepted Answer

DIAGNOSIS The jerky or stalling oscillation on the Rowenta VU5670 Turbo Silence is almost always caused by the degradation of the synthetic lubricant within the oscillation gearbox. Because the VU5670 utilizes a high-torque motor for its "Turbo" settings, the oscillation mechanism is under constant mechanical stress. Over time, the factory-applied grease mixes with ambient household dust and pet hair, creating a thick, abrasive paste that increases friction. When the grease becomes "gummy," the worm gear cannot smoothly drive the main oscillation gear. This results in the "stuttering" motion you see, where the fan hesitates before jumping forward. If the friction becomes too great, the motor's internal thermal protection may kick in or the plastic gears may slip, causing the oscillation to stop entirely. You can confirm this by turning the fan off and trying to gently push the fan head left and right; if you feel a "gritty" resistance or a physical catch, the gearbox is contaminated. FIX To restore smooth movement, you must perform a deep clean and re-lubrication of the gear assembly. Unplug the unit from the wall outlet to ensure total electrical isolation. Lay the fan on its back on a soft surface to prevent scratching the chassis. Locate the black plastic housing at the base of the motor neck. Remove the three Phillips-head screws securing the oscillation cover. Carefully lift the cover to expose the white nylon gear assembly. Do not pull the assembly away from the motor shaft too aggressively, as you may dislodge the synchronization pin. Using a cotton swab dipped in 90% isopropyl alcohol, scrub away all the old, darkened, or crusty grease from the worm gear (the small spiral gear) and the larger drive gear. Ensure the teeth are completely clear of debris. Apply a small amount of high-quality white lithium grease or a synthetic PTFE-based lubricant to the gear teeth. Avoid using WD-40, as it is a solvent, not a long-term lubricant, and will cause the problem to return within weeks. Manually rotate the gear several times by hand to ensure the grease is evenly distributed across the mating surfaces. Reinstall the black plastic cover and tighten the screws firmly, but do not over-torque them, as the plastic housing can crack. IF THAT DIDN'T WORK Check for gear tooth wear. Inspect the white nylon gears for any "shaved" plastic or missing teeth. If a tooth has snapped off, the fan will jerk every time that specific gap hits the drive gear. In this case, the gear assembly must be replaced as a single unit. Inspect the oscillation clutch pin. Ensure the pin connecting the motor shaft to the oscillation arm hasn't slipped or worn down. If there is excessive "play" or wobbling in the shaft, the pin may be worn, causing the timing to be off. Verify the oscillation knob functionality. On the VU5670, the oscillation is engaged by a physical pull-knob. If the internal spring or plastic catch of the knob is broken, it may only be partially engaging the gear, leading to intermittent stops. Test for motor fatigue. If the fan oscillates fine on low speed but stalls on "Turbo," the motor may be overheating, causing the plastic components to expand and bind. Ensure the motor vents are clear of dust using compressed air. HEADS UP Never use silicone spray or oil-based lubricants (like 3-in-1 oil) on these gears; they can degrade the white nylon plastic over time, making the gears brittle. Perform this lubrication maintenance once every two years if the fan is used daily during the summer to prevent permanent gear stripping. When cleaning with isopropyl alcohol, ensure the gears are completely dry before applying new grease, as alcohol can interfere with the adhesion of the lubricant. Always ensure the fan head is centered before tightening the housing screws to avoid putting lateral tension on the oscillation arm.

Question 8

my rowenta turbo silence fan just stopped working, no lights, nothing. it was fine yesterday.

Accepted Answer

DIAGNOSIS The complete loss of power—indicated by the absence of LED indicator lights and zero motor response—typically points to a failure in the electrical continuity of the power circuit. In the Rowenta VU5670 Turbo Silence, this is most frequently caused by a tripped or blown thermal fuse. This fuse is a safety mechanism embedded directly into the motor windings; it is designed to permanently break the circuit if the motor reaches a critical temperature threshold to prevent a house fire. This overheating usually occurs if the fan blades are obstructed by dust buildup or if the motor bearings have become stiff, causing the motor to draw excessive current (amps) and generate heat. If the fan was running on the highest speed for several days straight without a break, the heat soak likely triggered the fuse. You can confirm this by using a digital multimeter set to the Ohms (Ω) or continuity setting; if the fuse is blown, the meter will show an "Open" or "OL" reading across the fuse terminals, meaning the electrical path is severed. FIX To resolve this, you must bypass or replace the thermal fuse. Note that this requires basic soldering skills and a multimeter. Disconnect the power cord from the wall outlet immediately to avoid electrical shock. Remove the front and rear grilles by rotating them counter-clockwise. Unscrew the plastic nut holding the fan blade to the motor shaft and slide the blade off. Remove the plastic motor housing by unscrewing the chassis screws located at the base and rear of the motor assembly. Locate the thermal fuse: it is a small, silver or white cylindrical component crimped into the copper windings of the motor. Set your multimeter to continuity mode. Place the probes on either side of the fuse. If the multimeter does not beep or shows "OL," the fuse is dead. Carefully snip the failed fuse out of the circuit. Solder a new thermal fuse of the same rating (typically 130°C to 150°C) into the circuit. If you are in an emergency and cannot source the part, you can temporarily bridge the connection with a jumper wire to test the motor, though this removes the fire safety protection. Reassemble the housing, attach the blades, and secure the grilles before plugging the unit back in. IF THAT DIDN'T WORK Check the Power Cord for Internal Breaks: Inspect the entire length of the cable, specifically where it enters the base of the fan. These cables often suffer from "internal fatigue" where the copper strands break inside the insulation due to repeated bending. Use your multimeter to check for continuity from the plug prongs to the internal power board. Inspect the Capacitor: Look for the start/run capacitor (the black rectangular block near the motor). If the capacitor has bulged or leaked fluid, the motor will not have the torque to start, and in some cases, a shorted capacitor can trip the internal fuse instantly upon power-up. Replace the capacitor with one matching the exact microfarad (µF) rating. Test the Control Board: Inspect the PCB for "burnt" spots or popped capacitors. If the LED lights are off, check the small transformer or voltage regulator on the board. If you see a blackened area on the board, a component has fried and the board must be replaced. Verify the Wall Outlet: It sounds simple, but ensure the GFCI outlet hasn't tripped. Plug a lamp into the same socket to confirm the house circuit is active. HEADS UP Bearing Lubrication: Once the fan is working, apply a drop of high-grade synthetic sewing machine oil or 3-in-1 oil to the motor shaft. Stiff bearings are the primary reason thermal fuses blow. Dust Management: Use compressed air to blow out the motor vents every three months. Dust buildup acts as an insulator, trapping heat inside the motor and triggering the safety fuse. Avoid "Always On" Usage: Do not run the Turbo Silence on the maximum setting for more than 48 hours continuously. Give the motor a "cool down" period to extend the life of the windings. Solder Caution: When soldering the fuse, use a heat sink (like a pair of pliers) on the wire to prevent the heat from the soldering iron from damaging the surrounding lacquer on the motor windings.

Rowenta VU5670 Turbo Silence Stand Fan

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