In short

Plug large appliances directly into earthed wall sockets without extension leads, don’t share one socket between high-power appliances, wait a few minutes after power returns before restarting, and consider a suitable voltage protector or stabiliser if your supply fluctuates often. Codes like 9E and 85E usually indicate a voltage issue.

Why are modern appliances sensitive to power?

Modern washers and fridges use control and inverter boards that precisely control motor or compressor speed. These circuits save energy and reduce noise, but they’re affected by sudden voltage spikes or prolonged low voltage.

So most appliances have built-in protection: they stop and show a code at low voltage (such as 9E on washers and dryers, and 85E on fridges) rather than run unsafely.

Sockets and earthing: the foundation

  • Give each large appliance its own wall socket where possible.
  • Avoid extension leads and multi-plugs, especially with washers, dryers and dishwashers.
  • Make sure the socket is earthed and the plug fits firmly and doesn’t get hot.
  • A hot or discoloured socket or plug is a danger sign that needs an electrician.

Household wiring and earthing work must be done by a qualified electrician.

After a power cut

When power returns after a cut there can be brief fluctuations. If an appliance was running at the time, it can be better to unplug it until the supply stabilises, then restart.

A fridge may wait a few minutes before starting the compressor after power returns — normal protective behaviour, not a fault.

Do I need a stabiliser or voltage protector?

If your supply is usually stable, a good socket and proper earthing are generally enough. If it often drops or cuts in and out, a voltage protector (which disconnects on high or low voltage and delays reconnection) or a stabiliser rated for the appliance may help.

Choose protection based on the appliance’s power and type, ideally after asking an electrician or technician.

Signs of an electrical problem

In these cases unplug the appliance, don’t keep restarting it, and have it checked.

  • Voltage codes such as 9E or 85E.
  • The breaker trips when one appliance starts.
  • The display flickers or restarts on its own.
  • A burnt-plastic smell near the socket or behind the appliance.

Guides related to this article

Washer trips the power The breaker or RCD trips when it runs. Fridge not working Completely dead, or on without cooling. Dryer won’t start No response, or programme won’t start. Washer won’t start Won’t switch on, or won’t start the programme.

FAQ

Can power problems damage the control board?

Yes — sudden spikes or repeated fluctuations are among the causes of board failures, so protection and proper wiring matter.

Should I unplug the fridge during a power cut?

Not usually necessary, but if power returns with heavy fluctuations, a protector with a time delay can help.

Why does the breaker trip when the washer starts?

Possibly current leakage from the heater, motor or wiring, or a damaged socket. Our “washer trips the power” guide explains more.