Why Does My Bosch Washing Machine Keep Tripping the Electrics?
Unplug the machine, wait 60 seconds, then plug it into a different wall socket on a separate circuit to rule out a faulty socket or overloaded circuit — if the breaker holds, the original socket or circuit is the problem (takes about 5 minutes).
Fault description
When a Bosch washing machine trips the electrics, it means the appliance is drawing current in a way that the residual current device (RCD) or circuit breaker considers unsafe. The RCD's job is to cut power the instant it detects a fault, so a trip is actually the safety system working correctly — but it does mean something needs attention before you run another cycle.
The trip can happen the moment you switch the machine on, when the drum starts to spin, or when the heating element activates partway through a wash. Each of these timing clues points toward a different component. Error code E68 can appear on some Bosch models alongside this fault, typically indicating a heating circuit issue, though the underlying electrical fault may be broader than the heater alone.
Because this symptom involves mains electricity, it sits in the advanced severity category. Some checks are straightforward and safe for a homeowner to carry out; others require a service technician with the right test equipment.
Causes
- Faulty heating element — The heating element is the most common cause of an RCD trip in a washing machine. Over time the element's insulation breaks down, allowing current to leak to the metal drum or casing and triggering the RCD — this is also the primary driver of error code E68.
- Damaged or degraded motor — The motor's windings can develop an earth fault as the insulation ages or if water has entered the motor housing. The trip typically occurs when the drum begins to rotate, which is a useful timing clue.
- Water ingress into electrical components — A leaking door seal, pump housing, or detergent drawer can allow water to drip onto the wiring loom, control board, or terminal block. Even a small amount of moisture on live connections is enough to cause an RCD trip.
- Faulty carbon brushes or brush holders — Worn carbon brushes can arc against the motor commutator, creating a momentary earth fault. This usually produces a burning smell and causes the trip to occur specifically during the spin phase.
- Damaged mains cable or plug wiring — A pinched, chafed, or incorrectly wired mains cable can cause an intermittent short to earth. Check the cable along its full length for any visible damage, kinks, or signs of heat discolouration near the plug.
- Faulty or overloaded household circuit — If multiple high-draw appliances share the same circuit, the combined load can trip a breaker even when the washing machine itself is fine. A weak or ageing RCD can also become overly sensitive and trip on normal leakage current.
Step-by-Step Fix
- 1
Reset the breaker and note exactly when the trip occurs
Before touching the machine, reset your consumer unit and make a note of the precise moment the trip happens — on power-on, when the drum turns, or mid-cycle when heating starts. This timing narrows the fault to a specific component and will be useful information if you need to call a service technician.
- 2
Try a different socket on a separate circuit
Unplug the machine and plug it into a socket in another room that is on a different circuit. If the breaker no longer trips, the original socket, circuit, or RCD is the problem rather than the washing machine. Contact a qualified electrician to inspect the circuit.
- 3
Inspect the mains cable and plug
With the machine unplugged, run your hands along the full length of the mains cable feeling for kinks, cuts, or hard spots. Remove the plug cover and check that the wiring terminals are tight and correctly connected — brown to live, blue to neutral, green/yellow to earth. Replace the cable if you find any damage.
- 4
Check for visible water leaks around electrical parts
Pull the machine forward and look underneath and behind for signs of water pooling or dried mineral deposits near the wiring loom or motor. Check the door seal for tears and the detergent drawer housing for blockages that could cause overflow. Dry any damp areas thoroughly and allow the machine to air for 24 hours before testing again.
- 5
Inspect the carbon brushes
On many Bosch models the motor brushes are accessible from the rear of the machine after removing the back panel. Brushes shorter than about 5 mm are worn and should be replaced as a pair. Worn brushes are a straightforward DIY replacement and can resolve trips that occur specifically during spinning.
- 6
Test the heating element for an earth fault
Disconnect the machine from the mains. Access the element — usually behind the rear panel — and disconnect its wires. Use a multimeter set to resistance: measure between each element terminal and the machine's metal chassis. A reading of anything other than open circuit (OL) indicates the element is leaking to earth and must be replaced.
- 7
Replace the faulty component and retest
Once you have identified the faulty part — element, brushes, or cable — fit the correct Bosch-compatible replacement and reassemble the machine. Run a short 30°C cycle while staying nearby to confirm the breaker no longer trips before returning the machine to normal use.
When to call a service technician
Call a service technician if the trip occurs immediately when the machine is plugged in (before any button is pressed), if you can smell burning from inside the machine, or if you have carried out the steps above and cannot identify the faulty component. These signs suggest a fault in the wiring loom, control board, or motor that requires insulation resistance testing with professional equipment.
You should also seek professional help if the mains cable shows heat damage near the machine's terminal block, or if the RCD trips on multiple different circuits — this could indicate a more serious earth fault that is unsafe to operate around without proper diagnosis.
Prevention
The parts most commonly replaced when a Bosch washing machine trips the electrics are the heating element, the motor carbon brushes, and the mains inlet cable. Keeping a note of your machine's model number (found on the label inside the door frame) makes it straightforward to order the correct parts first time. Fitting genuine or quality-equivalent parts ensures the insulation ratings match the original specification, which is important for electrical safety.
To reduce the risk of future faults, avoid overloading the drum — excess weight stresses the motor — and run a monthly drum-clean cycle to prevent detergent residue build-up that can trap moisture around electrical components. Check the door seal every few months for small tears that could allow water to track toward the wiring.
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Frequently Asked Questions
Is it safe to keep resetting the breaker and using the machine?
No. Every time the RCD trips it is detecting a genuine current leak to earth. Repeatedly resetting and running the machine risks electric shock, fire, or further damage to the appliance. Stop using it until the fault has been identified and fixed.
What does error code E68 mean on a Bosch washing machine?
E68 indicates that the control board has detected a fault in the heating circuit, most often caused by a heating element that has developed an earth leak. It does not always appear alongside a trip, but when it does, testing and replacing the element is the logical first step.
Could the problem be with my consumer unit rather than the washing machine?
Yes, it is possible. An ageing or overly sensitive RCD can trip on the normal low-level leakage current that all appliances produce. Plugging the machine into a socket on a different circuit is a quick way to check. If it runs without tripping, ask an electrician to test your RCD.
Why does the machine only trip the electrics during the spin cycle?
A trip that occurs specifically during spinning usually points to the motor or carbon brushes rather than the heating element. As the motor ramps up to spin speed, a worn brush or failing winding creates an arc or earth fault large enough to trigger the RCD.
How long does a heating element replacement take, and can I do it myself?
On most Bosch washing machines, replacing the heating element takes between 45 minutes and 90 minutes with basic tools. It involves removing the back panel, disconnecting the element wires, and unbolting the element from the drum. If you are comfortable working on unplugged appliances and following a model-specific guide, it is a manageable DIY repair — but if you have any doubt, a service technician can complete it safely.