Why is my appliance so loud all of a sudden? An appliance that was quiet when you bought it and is loud now has often not broken. In the manuals we have read for our buying guides, the same handful of causes come up again and again, across washers, fans, heaters, treadmills and robot vacuums. Most cost nothing to fix.
This page collects them. Everything here comes from a manufacturer's manual or support page, and we name the maker each time. We are not repair technicians and we have not tested any of these fixes ourselves. If a manual tells you to stop using a product, stop.
Can an appliance get louder if it is not level?
Yes, and this cause comes up for almost every kind of appliance we cover.
Portable air conditioners.
An even surface is where Midea's manual wants the unit installed, to keep noise and vibration down, and its troubleshooting table blames an uneven floor for a noisy unit. Danby's manual names the same cause.
Dehumidifiers.
Danby warns that a dehumidifier standing on anything less than a flat, sturdy surface could make excessive noise and vibration.
Tower fans.
Levoit's manual answers a tower fan that is noisy in use by moving it to a hard, flat, level surface.
Mini fridges.
When a Summit mini fridge rattles, its manual puts an unlevel cabinet on the list of causes.
Washing machines.
Bosch ties lower noise and vibration to a correctly aligned washer with the lock nuts on its feet tightened. LG warns that extending the leveling feet more than necessary can cause the washer to vibrate.
Treadmills.
For a treadmill, NordicTrack's check is whether every one of the four feet sits firmly on the floor, adjusting the leveling feet if not.
A level from a toolbox and five minutes will rule this out.
Can dust or a dirty filter make an appliance louder?
Yes: several manuals list blocked airflow as a cause of noise.
Portable air conditioners.
Midea and Danby each count a clogged or dirty filter among the reasons a portable AC gets noisy. On Frigidaire's units, a filter light turns on once the fan has run 250 hours.
Space heaters.
Lasko wants a heater's intake grills vacuumed at two-week intervals. The filter on a Dr. Infrared heater is due for cleaning once a month.
Tower fans.
For its tower fans, Lasko allows a vacuum with a brush attachment as the only cleaning method and rules out taking the fan apart.
Robot vacuums.
iRobot puts brush cleaning on a weekly or more frequent schedule. On a Roborock, an odd sound as the dock empties the robot points, per its manual, to a blockage in the filter, air duct, dustbin or dust bag.
Ceiling fans.
Hunter says to clean blades regularly to prevent dust imbalance.
Can loose screws and bolts cause the noise?
Yes: loose parts are the next thing the manuals point to.
Ceiling fans.
When a Hunter fan clicks, the usual culprit is a loose blade or loose screws on a blade holder. Visual Comfort traces most wobble to blades sitting at unequal heights; its guide has you measure from every blade tip up to the ceiling and bring them all within an eighth of an inch.
Treadmills.
NordicTrack says to check that all frame bolts are snug.
Washing machines.
Bosch, ASKO and Speed Queen all tell installers to tighten the lock nuts on the feet. Speed Queen says that if they are not tight, the washer will not stay put.
Why is a new washer so loud?
Often because something was left in from the factory: a front load washer is shipped with bolts that lock the drum. In LG's manual, shipping bolts left in place may cause severe vibration and noise, and the result can be permanent damage. Bosch counts forgotten transit bolts among its causes of vibration.
Speed Queen's top loaders ship with a brace and a plug that have to come out. Maytag's manual says removing all shipping materials is necessary to avoid excessive noise.
If a washer is frighteningly loud on its first spin, this is the first thing to check.
Why is a ceiling fan humming?
The wall switch may be the cause, and it surprises people. Craftmade's install guide warns that running fan speed through a full range dimmer switch produces a loud hum. Honeywell's manual gives the same warning.
Hunter gives the reason: a capacitor control alters speed without making the motor hum, and a solid state variable control frequently does make it hum. Minka-Aire voids its warranty if a dimmer or another maker's wall control is used.
Levoit's tower fan manual carries a similar warning against solid state speed controls such as dimmer switches.
Can the floor make a washer or treadmill louder?
Yes: some noise is the building. LG's washer manual ranks concrete as the best floor and accepts wood when it meets FHA standards; a floor with too much flex needs reinforcing, since a floor that is not solid may lead to severe vibration and noise.
Miele finds that a concrete floor vibrates far less in the spin cycle than wooden floorboards or carpet do; where the floor is wooden, it calls for a plywood base fixed to the joists.
For a washer upstairs or in a flat, see also the apartment section of our washing machine guide.
Treadmills are the same story. By NordicTrack's account, what the downstairs neighbors hear is footstrike impact rather than the motor's hum, and a building with a concrete slab passes on very little vibration.
Peloton finds a Tread on hardwood or concrete can reverberate and make more noise than one on carpet or a heavy rubber mat.
Can a dry belt or worn parts cause the noise?
Yes. Treadmill belts dry out. SOLE's manual prompts for lubrication after 90 hours of use, and a skipped lubrication may void the warranty. LifeSpan sets the interval at 50 hours or three months.
On robot vacuums, iRobot has owners look for brush bearings seized onto the shaft, and replace any brushes where that has happened.
Could the setting be making it louder?
Yes, sometimes louder is simply higher. Dreo's support pages say the higher the setting on a fan or heater, the louder it will be. When a Frigidaire portable air conditioner is too loud, the maker suggests turning the fan speed down.
eufy says its carpet boost feature increases the noise level, and that you can switch it off. The apartment section of our robot vacuum guide covers the do-not-disturb hours makers offer.
Honda recommends switching on Eco Throttle for any load short of full, to cut generator noise further. The published figures for many of the appliances on this page are placed among everyday sounds in our decibel chart.
Temperature can do it too. ENERGY STAR explains that in rooms colder than 65°F, a dehumidifier's coils can frost over, which sends the compressor through repeated on and off cycles. If yours runs in a cool basement, our basement dehumidifier guide covers the minimum room temperatures makers rate their units for.
How much louder is the spin cycle or a fan's top speed?
A washer's spin cycle and a fan's top speed are far louder than the quiet end, by the makers' own figures. We counted the figures in two of our catalogs on 2026-10-26: 28 washers and 30 tower fans. These are counts of what is in our catalog that day, and the wider market may differ.
Of the 28 washers, 8 print one figure for washing and another for spinning. In all 8, spinning is rated 13 to 24 dB above washing, and in 7 of them the gap is 20 dB or more.
| Washer | Washing | Spinning | Gap |
|---|---|---|---|
| ASKO W4114CW | 53 dB(A) | 74 dB(A) | 21 dB |
| Beko WFTV10733XC | 52 dBA | 76 dBA | 24 dB |
| Blomberg WM98400SX | 52 dBA | 76 dBA | 24 dB |
| Bosch WGA12400UC | 52 dBA | 72 dBA | 20 dB |
| Bosch WGA14400UC | 52 dBA | 72 dBA | 20 dB |
| Bosch WGB24600UC | 51 dBA | 75 dBA | 24 dB |
| Bosch WGB246AXUC | 51 dBA | 75 dBA | 24 dB |
| Midea MLTW37A1BWW | 64 dBA | 77 dBA | 13 dB |
Read each row on its own. No maker in the table names its standard, distance or test cycle, so one row cannot be ranked against another. Each gap compares two figures from the same sheet.
Of the other 20 washers, 13 publish no figure at all. Four give a wash figure only: three Speed Queen top loaders quote 43dB "during agitation", and Equator gives a figure for its Quiet cycle. Two Midea models give a spin figure only, and one Midea figure says neither.
Tower fans tell the same story by speed. Of the 30 in our catalog, 14 print a figure for both the lowest and the highest setting, and the gap runs from 11 to 30.5 dB. Lasko lists 24 dBa on low and 54.5 dBa on high for its Ascend 36 inch DC fan (OST301).
Vornado prints one figure per speed for its OSCR37 tower circulator, 52, 49, 45 and 41 dBA from highest to lowest. Of the other 16, three publish nothing and ten give a figure for the lowest speed only. Two give one figure with no setting named, and Vornado's Duo prints three unlabeled figures for a fan with four speeds.
So a washer that seems to have got louder may simply be spinning. Time the noise against the cycle before you look for a fault, and check a fan on the speed it used to run at. A noise that stays loud at the same setting and point in the cycle is the one worth chasing through the checks above.
Which appliance noises are normal?
Several are, by the makers' own account: not every noise needs fixing.
Fridges.
Whirlpool and GE explain three fridge sounds: the compressor or the temperature control switching makes a click, the compressor and fans make a hum, and refrigerant flowing through the tubes makes a gurgle. For a fridge that shares a room with the sofa, our refrigerator guide's open-plan section names quieter brands.
Portable air conditioners.
Frigidaire, Midea and Dreo all describe gurgling or hissing as refrigerant flow, and normal.
New ceiling fans.
Minka-Aire expects most of the sounds a just-installed fan makes to stop during a 24-hour break-in period.
New treadmills.
While a Tread is breaking in, Peloton lists a thump and a chirp among its normal operating sounds.
New oil-filled radiators.
De'Longhi calls the creaks an oil-filled radiator makes the first time it heats up completely normal.
New robot vacuums.
iRobot notes that a Roomba fresh out of the box may run louder, and that it quiets down as it gets used.
What should you check before calling for repair?
Go through these seven questions first.
- Is it level, and are the feet tight?
- Is a filter, grille or brush clogged?
- Are any screws, blades or bolts loose?
- If it is a new washer, are the shipping bolts out?
- If it is a ceiling fan, is it on a dimmer?
- Is it on a higher setting than it needs?
- Does the manual describe the sound as normal?
If the answer to all seven is reassuring and the noise persists, contact the maker. Most of the products in our guides carry a warranty of at least a year.
Before you do, a few readings help. Our guide to measuring appliance noise at home sets out a step by step method for phone readings you can repeat, and explains why they will not match the figure on the box.
A note of the level, the distance and the setting gives a technician more to work with than a sense that it seems louder.
Sources
Every statement above is drawn from the manufacturer manuals and support pages cited in our buying guides. Each source is listed there with the product: washing machines, ceiling fans, portable air conditioners, dehumidifiers, tower fans, space heaters, treadmills, robot vacuums, mini fridges and generators.
