Question about Microwave Ovens
"Convection cycle runs 4 minutes and 15 seconds then shuts down."
In most cases, this is a bad thermistor, but it may also be loose wiring, or a problem on the control panel.
The thermistor should be on the top of the chassis and it will look like one of the attached drawings.
You will have to remove the outer cover of the oven to get to it.
Room Temperature 68°F(20°C) - 86°F(30°C)
Resistance Approx. 350k ohms - 155k ohms
(The higher the room temperature, the lower the resistance, and vice-versa).
If the meter does not indicate above resistance, replace the thermistor.
Also, if the thermistor is caked with grease, or it's rusty, it will need to be replaced.
If it has a broken lead, it cannot be repaired unless you spot weld orbraze it, and if you get it too hot, it will be destroyed.
To find the thermistors, you can visit Sharp'sAustralian support siteand click on the "Spareparts Outlets" link under "Frequented Resources".
(If you're not in Australia, please write back and let me know where you are!)
We'rehappy to help you with free advice and we'd appreciate yourthoughtful rating of our answer.
Posted on Dec 15, 2008
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