Why Does My Siemens Washing Machine Smell Like It's Burning?
Check and clear the pump filter of any debris or blockage, as a seized pump can cause the motor to overheat and produce a burning odour within minutes of starting a cycle (takes about 5 minutes).
Fault description
A burning smell coming from your Siemens washing machine is one of those faults you should never ignore or run through another cycle hoping it will go away. The smell can range from a sharp electrical or plastic odour to something closer to singed rubber, and each variation points toward a different part of the machine under stress. In most cases the smell appears during or shortly after a wash cycle, sometimes accompanied by the machine stopping mid-programme or vibrating more than usual.
The washing machine's drive system, motor, and electrical components are the most likely sources. When any of these parts are overloaded, worn, or failing, friction and heat build up quickly and produce the characteristic smell. Because this symptom can involve live electrical components, it is important to work through the checks below methodically and to unplug the machine before inspecting anything inside the cabinet.
Causes
- Worn or slipping drive belt — The drive belt transfers power from the motor to the drum. When it becomes worn, cracked, or misaligned it slips against the pulleys and generates heat, producing a strong rubber-burning smell that is often most noticeable at the start of a spin cycle.
- Overheating or failing motor — The motor can overheat if it is working harder than normal — for example, due to an overloaded drum, a seized bearing, or worn motor brushes. A failing motor often produces an acrid electrical smell and may cause the machine to stop mid-cycle as a thermal cut-out trips.
- Blocked or seized drain pump — If a foreign object such as a coin, hair clip, or piece of fabric has jammed the pump impeller, the pump motor is forced to work against the blockage and can overheat rapidly. This often produces a burning plastic smell and may trigger drainage errors.
- Faulty or scorched wiring and electrical connections — Loose terminals, damaged wiring insulation, or a failing capacitor can arc or overheat, producing a sharp burning plastic or electrical smell. This is one of the more serious causes and can be a fire risk if left unaddressed.
- Worn drum bearings — When the rear drum bearings wear out, the drum no longer spins freely and the resulting friction puts extra load on the motor and belt. You may also notice a loud rumbling or grinding noise alongside the smell, particularly during spin.
- Foreign object trapped between drum and seal — Small items such as socks, underwire from a bra, or coins can slip past the door seal and become trapped between the drum and the outer tub. As the drum rotates, the friction burns the item and produces a smell that can be mistaken for an electrical fault.
Step-by-Step Fix
- 1
Switch off and unplug the machine immediately
As soon as you notice a burning smell, stop the cycle and disconnect the machine from the mains. Do not restart it until you have identified the source. Allow the machine to cool for at least 20 minutes before touching any internal components.
- 2
Check the drum for trapped items
Open the door and rotate the drum slowly by hand. Feel around the edge of the door seal, pulling it back gently to check for trapped items such as coins, underwire, or small garments. Remove anything you find. If the drum feels stiff or grinds as you turn it, the bearings may be the issue — move to step 5.
- 3
Clean the pump filter
The pump filter is usually located behind a small panel at the bottom front of the machine. Place a shallow tray and some towels underneath, then unscrew the filter cap slowly to drain residual water. Remove the filter completely and clear any debris from both the filter and the housing. A blocked impeller will often have a burnt plastic smell attached to it.
- 4
Inspect the drive belt
With the machine unplugged, remove the back panel using a screwdriver. Locate the drive belt running between the motor pulley and the drum pulley. Look for signs of cracking, fraying, glazing, or a shiny worn surface. A belt that has been slipping will often leave black rubber dust on nearby components. Replace the belt if it shows any of these signs.
- 5
Check the motor brushes
Carbon motor brushes wear down over time and are a very common cause of burning smells in Siemens washing machines. With the back panel removed, locate the motor and identify the brush holders on either side. Remove each brush and measure its length — if either brush is shorter than around 15 mm, both should be replaced as a pair. New brushes are an inexpensive and straightforward repair.
- 6
Examine visible wiring and connections
With the machine still unplugged, visually inspect the wiring harness, connectors, and any visible terminals for signs of scorching, melting, or discolouration. Pay particular attention to the connections at the motor, control board, and heating element. Do not attempt to repair burnt wiring yourself — this requires a service technician.
- 7
Run a short test cycle and monitor closely
If you have cleared a blockage or replaced the belt or brushes, reassemble the machine and run a short 30-degree cycle while staying nearby. If the smell returns at any point, stop the machine immediately and do not use it again until a service technician has inspected it.
When to call a service technician
You should contact a qualified service technician without attempting further DIY work if you can see any scorched, melted, or discoloured wiring, if the machine trips your household circuit breaker when switched on, or if the burning smell is sharp and electrical rather than rubbery. These signs suggest a fault with the control board, wiring loom, or motor that carries a genuine risk of fire or electric shock if handled incorrectly.
Similarly, if you have replaced the drive belt and motor brushes but the smell persists, or if the drum is stiff and noisy indicating failed bearings, the repair involves dismantling a significant portion of the machine. A service technician will have the tools and diagnostic equipment to identify the exact component and replace it safely.
Prevention
The parts most commonly replaced on Siemens washing machines when a burning smell is diagnosed are the drive belt, carbon motor brushes, and the drain pump. The drive belt and motor brushes are wear items that degrade gradually over years of use, so replacing them proactively when you notice early warning signs — such as a faint smell only during spin, or slightly longer spin times — can prevent a more serious fault developing. Keeping the pump filter clean every one to three months is the simplest way to protect the pump motor from overheating.
Use the parts finder below to locate the correct drive belt, motor brushes, or drain pump for your specific Siemens model. Always match parts to your full model number, which is printed on the label inside the door frame.
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Frequently Asked Questions
Is it safe to keep using my Siemens washing machine if it smells like burning?
No — you should stop using the machine until you have identified and resolved the cause. A burning smell can indicate overheating electrical components or wiring, which carries a risk of fire. Unplug the machine and work through the checks above before running another cycle.
Why does my washing machine only smell of burning during the spin cycle?
A smell that appears specifically during spin is most often caused by a worn or slipping drive belt, since the belt is under the greatest load at high drum speeds. Worn motor brushes are another common cause, as the motor draws more current during spin. Both are relatively straightforward to inspect and replace.
How long do motor brushes last in a Siemens washing machine?
Motor brushes typically last between five and ten years depending on how frequently the machine is used and what programmes are run most often. Heavy use with frequent high-speed spins will wear them faster. When brushes wear down, the motor starts to spark and overheat, producing a burning smell and sometimes causing the machine to cut out mid-cycle.
Could a new washing machine smell of burning during the first few uses?
A very faint smell during the first one or two cycles can occasionally occur as manufacturing residues and protective coatings burn off internal components. However, this should be very mild and disappear quickly. Any strong, persistent, or clearly rubbery or electrical smell — even on a new machine — should be investigated and reported to the retailer or manufacturer.
Can an overloaded drum cause a burning smell?
Yes. Consistently overloading the drum forces the motor and drive belt to work much harder than they are designed to, generating excess heat. Over time this accelerates wear on the belt and motor brushes and can cause overheating even during a normal cycle. Always follow the load capacity stated in your Siemens machine's manual for the programme you are using.