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Percy
March 7, 2020
Trying to find out why my oven will not preheat to a certain temperture
For model number TGB557CCS2
Hi Percy,
Thank you for your question. If the oven is not heating correctly, then the issue is likely with the oven sensor, sometimes called the oven thermostat, and you will need to check it with a multi-meter. When testing the sensor with a multi-meter, the sensor should be tested at room temperature and it should be unplugged from the oven. You will need to measure the resistance between the two prongs at the end of the sensor connector. Replace the oven sensor if the reading is less than 900 Ohms or more than 1200 Ohms. If this checks out fine, you will need to check the electronic control board, the oven igniter, the safety valve, and the wiring between these parts to see which once is causing the issue. We hope this helps. Thank you and have a great day.
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I removed the broiler burner assembly held in by 5 screws across the inside top of the oven, as I removed the assembly the igniter slid out from the back of the oven and was attached to the assembly with a cannon plug, I disconnected the cannon plug and removed the whole assembly out of the oven and replaced the igniter which was attached by two screws and reassembled in the oven. Where I live in remote Alaska calling a repair technician is not an option, either figure it out or have a new appliance barged in.
2) Remove oven door. There requires that you remove the two square drive (SD) bolts on the inside, partially close the door and lift it off the hinges.
3) Remove the grills.
4) At the back remove the rear shield (aluminum panel held by 2 SD sheet metal screws.
5) this exposes the broiler igniter and its two wires. If its been replaced in past, there should be two porcelain screw-on wire connectors. Undo the connectors by turning them counter-clockwise. With a volt-ohmmeter, measure the resistance across the igniter. If its open circuited, its broken. If not, then its in the circuit board, and this help stop here. If this is the original igniter, it ends in a plastic connector. Disconnect by pulling it apart from its mating plug and again, check the continuity of the igniter. If its defective, reconnect the connector and cut each wire on the igniter side. Strip back about 1/2 inch of insulation on each lead.
6) inside the oven, using the SD driver, remove the 4 screw securing the broiler burner from the roof of the oven. The burner can now be removed, pulling the burner away from the gas jet on the right.
7) The igniter is now exposed and can be remove by removing the two SD drive screws.
8) Replace with the new igniter, being careful not to touch the black element, and feeding the wires though the rear oven wall.
