Microwave Oven Malfunction: Spontaneous Activation Due to Door Switch Failure
By
arm
Sesame, salt, and substance. A flagship bake.
Summary
A detailed technical account of a microwave oven malfunction where the appliance spontaneously turns on its lamp, fan, and turntable, behaving as if the door is open. The author investigates the issue, suspects failing door switches as the likely cause, and provides a thorough analysis of the microwave's internal components and circuitry. The article documents the progressive worsening of the problem over several weeks and explores potential solutions for this common microwave failure mode.
Key quotes
· 4 pulledMy microwave oven started to malfunction at around five years old. It started to randomly power on the lamp, fan, and turntable.
It progressively got worse over several weeks until it was mostly stuck on.
The microwave oven is not usable when this happens: It behaves as if the door were open, causing the control panel to ignore button input and to stop cooking if it was cooking.
The obvious suspect is a failing door switch, which is a common cause of failure.
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