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Microwave has no power or won't heat? A blown thermal fuse is often the cause. This safety part protects against overheating. DIY repair in 30 minutes.
It is difficult (if not impossible) to remove the electronic switches from the hard plastic latches. I replaced all three switches and both the upper and lower latches I also replaced the main 20 amp ceramic fuse which blew out when the latch/switches failed. Read more
Microwave won't turn on or has no power? A blown fuse is often the cause. This safety fuse protects circuits from shorts. Requires cover removal to replace.
In addition to blown fuse; the fuse holder was melted at one end. Checked the unit to see if any part or wiring that would cause the issue, none was visible. Referred to wiring diagram included inside to identify components, including interlocks. All seemed functional. Bought replacement 20A fuse. Fuse holder no longer available so bought similar unit with 25A rating - little retrofitting. Put unit back together, and it's working so far. Wife is happy. Read more
Microwave overheating or won't start? This fixed-temperature thermostat acts as a safety switch to prevent thermal damage. Straightforward repair.
Microwave not heating but all other functions work? This magnetron thermostat protects against overheating. Easy DIY repair in under an hour.
Removed unit from wall and took outer shell off, de-energized capacitor and then took a multi-meter and tested all the High voltage parts and magnetron. They tested out fine other than the diode and then I looked at the "Safety" circuit if you will the power loop that goes through door switches and thermostats to energize the High Voltage transformer and magnetron. Turns out the thermostat that is on the side of the magnetron wasn't closed, so I took a butane torch and heated it up past the... Read more