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Every fault code I am able to find concerning F-4 period has to do with bad oven sensor. This is the probe coming through the wall inside the oven to read oven temp and to regulate it. Hope this helps. Rick
What part did you call "thermostat"? If you?re talking about the device which operates the oven temperature, your oven does not have such thermostats. It has two oven temperature sensors (one in each oven) and a control board (ERC). An error code "F4" will be displayed along with a beeping sound if the ERC determines an open oven temperature sensor circuit. It can be the sensor itself or the wires that connect the sensor to the ERC. The F4 message will not be displayed in the time of day mode. To get access to an oven sensor and wires, the oven has to be removed from the cabinet. Then you have to remove the rear cover. Then unplug the oven sensor and check the resistance across the oven sensor. It?s supposed to be about 1100 ohms at room temperature. If the resistance is incorrect, the sensor is bad and needs to be replaced. If not, check all the wires from the oven sensor to the ERC. If it is not the sensor and wires, you have to replace the ERC, but most likely the problem is with the wires and/or connections. Part number for ERC is 62965, part number for oven sensor is 62593. Gendos....post back.
I found a new touch panel (or membrane switch pad) for < $166 at http://www.myapplianceparts.com/ . The person on the phone at this company was very pleasant and immediatley confirmed that they had 10 of these in stock. This suggests to me that more than a few of these have gone bad. Luckily, they are very simple to replace if you are willing to turn a few screws and carefully pull of the electrical connectors. I dissasembled mine in 20 minutes, got the part number (#62682B for my ECS130), and found best price in 20 minutes.