Samsung microwave keeps blowing the fuse
I've got a Samsung microwave (MC28M6055CK) that's around a year old and it trips the plug fuse / RCD as soon as I start it. Really hoping it's a cheap fix.
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Samsung MC28M6055CK trips fuse or RCD when microwave starts
- The problem
- A Samsung microwave, model MC28M6055CK, reportedly blows the plug fuse or trips the RCD as soon as Start is pressed. The appliance is around a year old.
- Likely cause
- The accepted reply says this symptom most strongly suggests an internal fault in the microwave high-voltage circuit, particularly if the trip happens only when microwave heating starts. It notes this is a diagnosis only, not a confirmed component failure.
- What fixed it
- No repair was confirmed in the discussion. The accepted advice was to stop using the appliance, check the mains lead, plug and correct plug-fuse rating externally, try a different wall socket without an extension lead, and compare whether the fault occurs on microwave, grill and combination modes. If it still trips when heating starts, further diagnosis should be carried out by a suitably qualified appliance engineer.
- Checks to try
- Observed that it trips as soon as Start is pressed
- Advised to note whether it blows the 13A plug fuse or trips the RCD/RCBO
- Advised to try a different wall socket
- Advised to remove any extension leads
- Advised to check whether it trips on microwave only, grill only, or combination mode
- Advised to inspect the mains lead and plug externally
- Advised to check the plug fuse is the correct rating
Safety: Do not remove the cover unless properly trained. Microwaves contain high-voltage components, including a capacitor that can retain a dangerous charge even when unplugged.
1 Answer
If it trips as soon as you press Start, that usually points to a fault in the high-voltage side rather than something simple like the door catch, although it’s hard to be certain without testing. Unfortunately, microwave faults that blow fuses/RCDs are not often “cheap fixes”, and they can be dangerous to investigate.
1. First, note exactly what is tripping: - If it blows the 13A plug fuse, that suggests a heavy current fault/short. - If it trips the RCD/RCBO, that suggests current leaking to earth. - If it only happens on microwave heating, but not on clock/light/turntable-only functions, that strongly implicates the high-voltage circuit.
2. Try a simple isolation check: - Test it on a different wall socket if possible. - Remove any extension leads. - If it still trips immediately when heating starts, the fault is inside the microwave.
3. Check whether it trips on all cooking modes: - Microwave only - Grill only - Combination mode If grill works but microwave mode trips, that narrows it to parts such as the high-voltage transformer/inverter, capacitor, diode or magnetron.
4. Inspect only externally: - Look for damage to the mains lead or plug. - Check the plug fuse is the correct rating.
5. Do not remove the cover unless you are properly trained: - Microwaves contain a high-voltage capacitor that can retain a dangerous charge even when unplugged.
Given the symptoms, I’d strongly recommend a qualified microwave engineer. Isolate it from the mains before any inspection, and for any internal, mains, or high-voltage work use a competent professional.
WhitegoodsHelp AI
WhitegoodsHelp AI Assistant
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?
Your Answer
Sign in to share your expertise and post an answer.