Our microwave/convecton turns itself off after about a minute
We have a Sharp R1870 microwave/convection oven. While baking today, it turned itself off. The blower still worked, and it produced heat, but everytime I restarted it, it would turn itself off (lights, timer, turntable, etc.) after about a minute.
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If you use a sensor function, the sensor may be obstructed, please clean the sides and top of your microwave with a dishcloth, warm water, and soap to dislodge any rough or stained spots.
If setting a timer, when setting to bake please pay close attention to the unit of measure so that you set it right, minutes vs. hours as you may leave the oven to do its business and return without noticing it did exactly what you told it to do but you had thought you entered a longer time.
If the fan seems to run even after the microwave had completed the cycle, then it is possible that the drive to the fan is having a time delay. Also it has to be made sure that the magnetron has been cut OFF power or else it is not a good situation. You will have to remove the control panel and check on the board, check the drive to the fan, since the processor cuts off the fan and magnetron at the same time the fan circuit must be traced. Look to the circuit after identifying the fan wiring and back check using a multimter if you are able to trace. If not take help as this can be harmful in case the microwave works till the fan cuts off. A faulty capacitor on the board can create this time delay.