Question about Microwave Ovens
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Posted on Jan 02, 2017
Code F4 means you need to repair the line to or replace the oven temperature sensor. The line typically runs from the display to the back of the oven, you'll have to trace it yourself. The oven sensor should be mounted to the back of the oven lining (Obviously on the inside) by two screws. Disconnect the power from the unit and unmount the sensor to check it, you should have around 1080 ohms of resistance but first you'll have to get that annoying plastic housing of wires through the mount hole and disconnect it so you don't lose it inside the oven. If you don't see screws from the inside of your oven than you'll have to remove the back panel to access them, but this may be a good thing as you don't have to worry about fiddling the plastic connector piece into the oven. You're measuring the resistance from one lead to the other inside that plastic housing, again at around 1080 ohms in a 70 degree environment. If you're way off, or 5 - 6 ohms off, you'll need to replace the sensor. If the error occurs while cooking you can also run the oven hot, turn off and disconnect the power and take your measurements again. If they read the same your wiring harness should be okay and replace the sensor.
Oh and btw, you'll most likely have to splice the wires to adapt to your new sensor they're never the same.. not in my experience lately anyway.
Posted on Apr 25, 2010
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