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Appliance Medic
Appliance Medic, Home Appliance Technician
Category: Appliance
Satisfied Customers: 10831
Experience:  Factory Trained CFC Technician
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I have an LG electric range. The oven heats up to max temperature

Customer Question

I have an LG electric range. The oven heats up to max temperature every time you turn it on, either on bake or convection. I replaced the thermal fuse, sensor and the electronic control board. I still have the same problem I did before I replaced these parts.
Submitted: 1 year ago.
Category: Appliance
Expert:  Appliance Medic replied 1 year ago.
Welcome and thank you for your question. I will be the professional that will be assisting you.
Hi, the only thing left is the wire harness. You have to either have a broken wire or loose connection. I would start with the temp sensor wire connection and work back to the board. I would suspect a broken wire or loose connection there since the sensor tells the control board when to stop sending voltage. I would ohm the wires out and make sure they have continuity. Based on what you've replaced that's the only thing left.
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Thank you
Customer: replied 1 year ago.
I checked all the connections. I have continuity on the sensor and the wires that lead to the sensor. I tried the oven again and it went over 450 when it was set for 350
Expert:  Appliance Medic replied 1 year ago.
Ohm the sensor from the control board connection. Is it the same as if you tested it right at the sensor?
Customer: replied 1 year ago.
about 34 at the connection that connects to the sensor. about 30 at the connection that attaches to the board
Expert:  Appliance Medic replied 1 year ago.
30 ohms?
Customer: replied 1 year ago.
i am not an expert on the meter. I have it on resistance. I pushed the needles into the wire side of the connection again. I got 37.00 + or - at the wire before it goes into the sensor, with the other end plugged in the board. I unplugged the connection at the board and plugged it back into the sensor and got about 37.00 + or -. Is that what you wanted me to do?
Expert:  Appliance Medic replied 1 year ago.
Yes, that is correct. The only other part that would cause this is the relay baord. You replaced the main control board right? Click here for part
Customer: replied 1 year ago.
yes. the main board that has 15 or so connections to it. it is the one that displays the time and oven temp
Expert:  Appliance Medic replied 1 year ago.
Yes, the only other part is the board in the link above.
Customer: replied 1 year ago.
so you believe that is the problem? the other board in the link in the prior message?
Expert:  Appliance Medic replied 1 year ago.
Yes, the oven relay pcb is the only part you haven't replaced. You've replaced every other part and say the wire connections and wires themselves are good.