Question about Ovens
Unplug the power cord and check for voltage at the outlet. Inspect the cord for any damage or burn marks. Because of all the safety devices in a microwave oven, any one of them could be the cause. You will need to remove the outside shell of the microwave. Unscrew the screws underneath and on the back that hold the shell in place and slide it off. Here's a list of things to check that may be causing this problem.
Disconnect the power.
Disconnect the sensor harness from the control.
Measure the sensor resistance (white leads).
The resistance should be 1080 ohms at room temp.
If the sensor is open the resistance is usually over 2900 and you get an F3 message.
If the sensor is shorted the resistance is usually less than 950 ohms and you get an F4 error message.
Also look for damaged harness terminals if not a bad sensor.
Hope this helpout...
Posted on Jul 21, 2010
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Posted on Jan 02, 2017
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