Common Appliance Faults and When to Call an Electrician

By Maintaining Your Electric Shower for Safety and Performance
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27 Jul 2026

Common Appliance Faults and When to Call an Electrician

When an appliance stops working, it is tempting to assume the worst. But many faults begin at the plug, the socket, or the power supply rather than inside the machine. A calm, methodical approach keeps you safe and often saves money.

Start with the power supply, not the appliance

Before you unplug anything, check whether other items on the same circuit are working. If a whole row of sockets is dead, the issue may be the circuit rather than the appliance. Check the consumer unit for a tripped MCB or RCD. If it trips again immediately, stop and call an electrician. If only one appliance is affected, try it in a different socket on a different circuit. If it works, the fault is likely the original socket or its wiring. If it still fails, the appliance is suspect.

Test the suspect socket with a known working appliance, such as a lamp.
Look for scorch marks, brown staining, or a burning smell around the socket or plug.
Never ignore a plug that feels hot, buzzes, or sparks when you insert it.

Plug, fuse and cable faults

The plug is the most common point of failure. A loose fuse, a broken wire strand, or a poorly fitted cord grip can cause intermittent power. UK plugs use a 13A fuse for high-power appliances like kettles, irons, and heaters. Lower-power items such as lamps, radios, and phone chargers should use a 3A fuse. Using the wrong fuse can damage the appliance or the cable. If the fuse blows again after replacement, do not keep replacing it: there is a fault that needs investigation.

Inspect the flexible cable for cuts, kinks, or damage near the plug or appliance. A cable that is warm to the touch under normal load is a warning sign. If the plug pins are discoloured or the socket outlets are loose, the socket may need replacing. This is not a DIY job unless you are competent and can isolate the circuit safely.

When an RCD or MCB trips

An RCD protects people from electric shock by detecting a small imbalance in current. An MCB protects the cable from overload. If an RCD trips when you use a particular appliance, that appliance may have an earth leakage fault, often caused by water ingress or damaged insulation. Unplug the appliance and try to reset the RCD. If it holds, the appliance is likely the culprit. If it trips with everything unplugged, the wiring itself may be faulty.

Never tape down or bypass an RCD or MCB. It is there to save lives.
If an RCD trips repeatedly, keep the appliance unplugged and seek professional help.
Test your RCDs every three months using the test button. They should trip immediately.

Appliance-specific clues

Some faults are obvious. A washing machine that trips the electrics mid-cycle often has water in the motor or heating element. A fridge that runs constantly but is not cold may have a failed thermostat or dirty condenser coils, which wastes energy. An oven that heats unevenly or takes longer to reach temperature may have a failed element. A tumble dryer that smells hot or takes multiple cycles to dry clothes needs urgent attention because lint and heat are a fire risk.

Small appliances matter too. A kettle that takes longer to boil or a toaster that only heats one side is using more energy for less result. If the plug or cable is damaged, replace the appliance or have it repaired by a qualified person. For built-in appliances, always switch off at the consumer unit before pulling them out.

When to call an electrician

Call a registered electrician if you see or smell burning, if a fuse blows repeatedly, if an RCD will not reset, or if you receive a shock from an appliance or socket. Also call if the fault involves fixed wiring, such as a dead circuit, a broken socket, or a light fitting that flickers with a buzzing sound. In the UK, most electrical work in homes must meet BS 7671, and may be notifiable under Part P. A qualified electrician will have the right test equipment and insurance.

You can safely replace a plug or fuse if you are confident and the appliance is unplugged. Do not attempt to repair internal wiring, replace heating elements, or work inside a consumer unit unless you are trained. For landlords, portable appliance testing is not a legal requirement for all homes, but it is good practice for rented properties.

Energy advice to prevent faults

Good habits reduce both risk and bills. Avoid overloading sockets with adapters and extension leads; a single 13A socket can supply 3kW, but a multi-way bar with several high-power appliances can overheat. Use the right fuse for the appliance. Keep vents and condenser coils clean on fridges and freezers. Defrost freezers regularly if they are not frost-free. Run washing machines and dishwashers on eco cycles, and use full loads where possible. A faulty appliance often uses more energy, so repairing or replacing it can pay for itself.

If you are unsure, switch off at the socket and call a professional. It is always better to lose a little convenience than to risk a fire or a serious shock. Your home's electrical system is safe when it is maintained, respected, and left to those who know it best.

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5 Comments

Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply
- John Abraham says Jul 21, 2024 at 10:00am
  
  I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
  Reply
  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply

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