Power button not turning on washing machine
Washing machine has no power. I have power going to the main PCB. I have a new PCB, but before connecting, i noticed that the original PCB has a blown glass fuse. I cannot find any online wiring diagram, so I am wondering what this glass fuse protects.
2 Answers
If the glass fuse on the main PCB has blown, it usually means the board has seen a serious fault rather than the fuse failing for no reason. On a Samsung washer like this, that fuse is commonly there to protect part of the board’s incoming mains supply or low-voltage power supply, but without the circuit diagram it’s not possible to say exactly which section it protects.
1. Isolate the appliance from the mains before inspecting anything internally. Do not fit the new PCB until you’ve checked for an underlying short, or the replacement board could blow as well.
2. Check the mains supply path first: - Plug fuse - Mains lead - On/off switch or user interface board - Door interlock wiring - Any signs of burning, loose connectors, or water tracking onto the PCB
3. Inspect the original PCB carefully: - Look for burnt tracks, cracked components, blown varistor, damaged rectifier, or failed power supply parts - If the glass fuse has blackened or shattered, that often points to a heavy short on the board or a component downstream
4. Disconnect likely loads one at a time and test for shorts with the machine isolated: - Drain pump - Motor - Heater - Door lock - Mains filter A failed suppression filter, door lock, heater to earth, or motor fault can sometimes take out a board fuse.
5. Check wiring loom condition, especially where it passes near the drum or cabinet edges. A trapped or chafed wire can short to chassis and blow protection components.
If you need parts, use the full model number WF12F9E6P4W/EU when searching at spares4appliances.co.uk. If you are dealing with live mains testing or board-level diagnosis, it’s best to get a qualified engineer, as replacing the PCB alone may not cure it.
WhitegoodsHelp AI Assistant
You may also find this guide on our main site helpful: "Washing Machine Drum Not Turning" – https://www.whitegoodshelp.co.uk/washing-machine-drum-not-turning/
This answer was generated automatically by the WhitegoodsHelp AI Assistant. It is not provided by an engineer or any other qualified person, may be inaccurate or incomplete, and is not professional or technical advice. Do not rely on it. Always use your own judgement and consult a qualified engineer before carrying out any electrical, gas or water work. Use is entirely at your own risk. See our full Terms of Use.
SAFETY FIRST: READ BEFORE ACTING ON THIS GUIDANCE
Never work on a live appliance
Always unplug it at the mains before going near it with any tools.
Never attempt gas work
By law, gas appliances must only be worked on by a Gas Safe registered engineer. If your fault involves gas, stop and call a professional. Do not attempt it yourself.
Watch for sharp edges
Outer panels are smooth, but internal parts have sharp machined edges. Wear protective gloves and arm sleeves.
Water appliances can leak
Turn off the water supply before disconnecting any hoses.
Know your limits
If you are not confident testing or working inside the appliance, stop and call a professional.
AI guidance, not guaranteed
This response is generated automatically by the WhitegoodsHelp AI Assistant. It is not professional or technical advice, may be incomplete or wrong, and must not be relied upon. Always use your own judgement and consult a qualified engineer before any electrical, gas or water work.
This is general information only and is not professional advice. The WhitegoodsHelp AI Assistant is not an engineer and is not qualified. See our full Terms of Use.
Need Professional Help or Spare Parts?
Where our AI response says "heavy short on the board or a component downstream", I would second this - I would be looking for a component short that has popped the fuse.
It may be a time for an engineer, as you run the risk of fitting the new PCB and it popping as you apply power, and you'll be in the same boat, but minus what you paid for the PCB.
You can find an engineer from our platform here: https://www.whitegoodshelp.co.uk/engineers/
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