Dead GE Advantium Microwave Solution, Thermal Cutoff Fuse
Posted 14 July 2012 - 03:17 PM
It was an easy fix to remove the control panel and then the Thermal cutout fuse shown. Once replaced, All the lights came on and it started to work again, No problem.
The Thermal Cutout Fuse is heated by air exhausted from the cooking chamber of the oven. If there is a food fire or other other overheat condition, this fuse is supposed to temporarily open, Thereby bringing all operation of the oven to a DEAD STOP. Emphasis on the DEAD, i.e. electrically dead. Problem is, these little fuses are poorly designed/constructed such that they will remain open when they are supposed to close as the oven cools off.
UNPLUG THE UNIT FROM HOUSE POWER BEFORE DOING ANYTHING !!!!!
1. There are two screws pointed straight down above the upper grill. Remove those with a phillips screwdriver, then pull the grill off.
2, One stainless screw is now revealed above the center of the control panel. Remove it and then slide the panel up 1/2 inch by pushing/tapping up from the bottom of the control panel then lift it out.
3. There will be less stress on both you and the equipment if you just remove all wiring harness plugs from the rear of the control panel.
4. You will then be able to see the offending cutoff fuse secured by one screw to the floor of the controls cabinet just behind where the control panel sits. Test across the two terminals. If you get no continuity or anything more than ZERO ohms, then replace the part because it is not providing a closed circuit EVEN THOUGH THERE IS NO HEAT CONDITION PRESENT.
5. Remove the two white plastic insulated spade plug connectors, then the one screw and lift the part out.
LongLow.jpg 120.46KB 16 downloads This Shows the General Location of the Fuse at the bottom center after the control panel is removed
CloseupLow.jpg 77.73KB 14 downloads This shows a closer view of the Fuse
FusebottomLow.jpg 69.99KB 12 downloads This is a view of the aluminum bottom of the fuse
InsidesLow.jpg 50.58KB 21 downloads When the fusebottom is removed the mechanism is revealed. The small purple stick is made of a ceramic or plastic which expands slightly when heated. One end of the stick touches the aluminum, the other end pushes against a flexible brass strip (at the small dimple in the center). This causes two contact points to separate, thereby opening the circuit. The contact points appear to be oxidized from the presence of heat, DUH !!! and dampness from cooking food.
- Samurai Appliance Repair Man likes this
Posted 14 July 2012 - 03:37 PM
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Posted 15 July 2012 - 05:48 AM
The small purple stick is made of a ceramic or plastic which expands slightly when heated.
The purple stick is just plastic, what actually warps is a bi-metal disk, (that should be between the aluminum face and the plastic piece that is remaining in the aluminum face), of the t-stat which then depresses the purple plastic stick opening the contact points.
- binthere222 likes this
Willie's Budget Appliance Repair
Eureka, CA 95501
Posted 15 July 2012 - 06:39 PM
I shoulda disassembled more b4 talkin. Bimetallic disk is there shure enough, to push on the purple stick.
Any ideas on why I was burning to a crisp so many door switches? I have seen some pretty impressive videos of arcing coming from the advantium magnetron and that one switch is pretty close to the magnetron.
Ideas or experience in this area??
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Source: Dead GE Advantium Microwave Solution, Thermal Cutoff Fuse
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