Why Is My Washing Machine Tripping the MCB?
A washing machine that repeatedly trips the MCB (Miniature Circuit Breaker) is drawing more current than the circuit can safely supply. This is a serious electrical safety signal that should not be ignored. While some causes are simple, others — particularly a faulty motor or heating element — require a qualified technician. Here is how to identify and address the cause.
Quick Answer
A washing machine trips the MCB because of a faulty heating element (most common), a motor fault, a damaged power cord or plug, a water leak onto electrical components, or a shared circuit that is overloaded. Do not keep resetting the breaker without finding the cause.
Causes and What to Check
1. Faulty Heating Element (Most Common)
The heating element in a front-load washing machine heats water for hot wash programmes. When the element develops a fault, it can draw excessive current and trip the MCB — often only during cycles above 40°C.
- Test: Run the machine on a cold wash (30°C or Cold setting). If it does not trip on cold but trips on hot, the heating element is the likely culprit.
- Solution: A technician needs to test the element with a multimeter and replace it if faulty.
2. Motor Fault
A failing motor draws abnormally high current — especially during spin. If the MCB trips consistently during the spin phase, the motor is the first suspect.
- Signs: MCB trips at spin, drum moves sluggishly or makes grinding noises before tripping.
- Solution: Requires professional diagnosis — motor bearing failure or winding fault needs a technician.
3. Damaged Power Cord or Plug
Frayed wires, a bent plug pin or a loose internal connection can cause a partial short circuit that trips the MCB.
- Unplug the machine and inspect the cord along its full length for cuts, fraying or burn marks.
- Inspect the plug — bent pins or discolouration indicate overheating.
- Do not use the machine with a damaged cord. Replace the cord before using it again.
4. Water Ingress on Electrical Parts
If the machine has a leak — from the door seal, water inlet hose or pump filter — water can reach electrical components and cause a short circuit.
- Check under the machine for water pooling.
- Inspect the door seal for tears.
- Tighten or replace the inlet hose connections.
- Do not use the machine if you suspect water is reaching electrical parts — this is a fire and electrocution hazard.
5. Overloaded Circuit / Shared MCB
If the washing machine shares a circuit with other high-power appliances (geysers, ACs, irons), the combined load may exceed the MCB’s rated current — typically 16A or 20A for a washing machine circuit.
- Solution: Plug the washing machine into its own dedicated 15A or 20A socket — do not use an extension lead or multi-plug shared with other appliances.
- If your home does not have a dedicated circuit for the washing machine, an electrician can add one.
6. Capacitor Fault
The start capacitor helps the motor start. A failing capacitor can cause the motor to draw high starting current and trip the MCB at the beginning of a cycle.
Safety Warning
Never bypass or tape up an MCB that keeps tripping. The MCB is protecting you from a potentially dangerous fault. If the breaker trips every time the machine is used, stop using it until a qualified technician inspects it.
Prevention and General Tips
- Have a dedicated 15–20A earthed socket installed for your washing machine.
- Inspect the power cord annually for wear.
- Keep the machine area dry — check the drain filter to prevent leaks. See our drum and filter cleaning guide.
- If you suspect a child lock or control issue is preventing the machine from running cycles properly and causing an overload, read how to turn off child lock on washing machines.
- Ensure your machine is the right size for your loads — overloading can stress the motor. Check the washing machine capacity guide.
When to Call a Technician
Call a certified technician immediately if: the MCB trips as soon as the machine is plugged in, if you see sparks or smell burning, or if the cord or plug is hot to touch. Do not attempt to open the machine or inspect internal electrical components yourself.