A customer service call-out costs on average between £80 and £150 just for the visit, before the technician has even touched anything. In the majority of cases, the fault has a simple cause — one you can identify, and often fix, yourself in just a few minutes.
Here are the 5 checks to run systematically before picking up the phone.
1. Check the power supply
It sounds obvious, but it's the number one cause of "faults" that aren't faults at all. Before concluding your appliance is dead, check methodically:
- Is the socket live? Test it with another device (charger, lamp). A faulty socket or a tripped circuit breaker is often the culprit.
- Is the power strip or extension lead switched on? Strip switches are easily knocked off by accident.
- Is the power cable firmly plugged in at both ends? Some appliances have a detachable cord at the back that can work loose.
- Has the circuit breaker tripped? Check your fuse box.
For battery-powered devices (remotes, cordless tools, portable speakers): always start by replacing or recharging the battery before any other diagnosis.
2. Re-read the product manual
The manual is the first — and most underused — troubleshooting tool. It systematically includes a "Troubleshooting" or "Problem solving" section listing common faults and their solutions. In many cases, the answer is already written there.
If you've lost the paper booklet, don't worry: you can find your appliance's manual for free by searching for its exact reference number. This reference is usually on a label stuck to the back or underside of the appliance, sometimes in the battery compartment or behind a flap.
Look in the manual for: the correct start-up procedure, conditions of use to observe, and above all the meaning of any indicator lights or codes shown on the display.
3. Try a reset
A reset is the universal fix for electronic devices — and it works far more often than you'd think. An appliance can "freeze" after a brief power cut, a failed update, or simply an inconsistent internal state.
The basic method:
- Switch the appliance off and unplug it from the mains.
- Wait 30 seconds to 1 minute (to allow the capacitors to fully discharge).
- Plug back in and switch on.
For a deeper factory reset, the manual often specifies a button combination (for example, holding the power button for 10 seconds, or pressing several buttons simultaneously). A factory reset clears personal settings but resolves most software-related lockups.
4. Check consumables and filters
Many appliances have wear parts that, once they reach end of life, trigger safety shutdowns or malfunctions. This isn't a fault — it's routine maintenance.
- Home appliances: pump filter (washing machine, dishwasher), air filter (air conditioner, purifier), water tank (steam iron, humidifier).
- Printers: empty cartridges or dried ink, clogged print head.
- Vacuum cleaners: full bag or blocked HEPA filter, brush roll tangled with hair.
- Heating: clogged filter on fan heaters, descaling required on boilers.
Your manual lists the consumables to maintain and how often to replace them. A clogged filter not only reduces performance but can cause overheating and trigger a thermal safety shutdown.
5. Decode the error code on the display
Modern appliances — washing machines, dishwashers, boilers, TVs, ovens — display error codes that look cryptic but are actually very specific. A code like E3, F21, E18 or C6 corresponds to a fault documented by the manufacturer.
What to do:
- Note the code exactly as displayed (letters and numbers, in the correct order).
- Look it up in the "Error codes" section of your manual — it's almost always listed with its cause and what to do next.
- Some codes indicate a simple safety condition (overheating, open door, no water supply) that you can clear yourself.
- Others point to a specific faulty component, which will allow you to describe the problem precisely to a technician — speeding up the repair and potentially reducing costs.
The bottom line
These 5 checks rarely take more than 10 minutes in total. In many cases, they're enough to identify — and even fix — the problem without calling a professional. And even if a repair is eventually needed, you'll arrive with a precise diagnosis that saves the technician time, and therefore saves you money.
If you need to find your appliance's manual to check the error code table or the reset procedure, you can search for it for free by brand and reference number.