LG Oven fan won't turn off

Won’t your LG oven fan turn off? First determine whether it is the cooling fan completing a normal cooldown. The fan may run for more than an hour after the oven is turned off, especially after a high-temperature cycle, and should stop once the oven components cool. If the fan keeps running after the oven has cooled, the most likely cause is a stuck relay in the oven control board, which can send constant voltage to the fan motor. The main control board can have the same failure. Before replacing either board, check the wiring diagram and test the oven thermostats. A defective high-limit thermostat or thermostat may continue sending power to the fan after the oven cools. Use a multimeter to test thermostat continuity, following proper safety procedures. These issues can cause an LG oven fan not turning off, an oven cooling fan running continuously, or an oven fan that keeps running after shutdown. Control boards are often misdiagnosed, so test related components first. Enter your LG range, stove, or oven model number to find the exact replacement fan, thermostat, or control board for your appliance.

01 - LG Range/Stove/Oven Oven Control Board

The oven control board has relays that regulate power to the bake, broil and fan circuits according to the user settings and sensor input. If one of these relays shorts out, the control board may send continuous voltage to the oven fan. However, this is rarely the case. Before replacing the control board, first check the oven thermostats. If an oven thermostat fails, it may cause the oven fan to run continuously.

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02 - LG Range/Stove/Oven Control Board

If the oven fan is not shutting off, a relay on the control board may be stuck closed sending constant power to the oven fan. Check the wiring diagram first before replacing the board. Control boards are often misdiagnosed.

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Common

03 - LG Range/Stove/Oven Main Control Board

The main control board has relays that send voltage to the fan motor. If one of the control board relays shorts closed, the control board may send continuous voltage to the fan. If the fan continues to run after the oven is turned off and cooled down, the main control board is likely defective. If the control board is defective, replace it.

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Common

04 - Normal Cooling Down Period

The oven cooling fan may run well over an hour after the oven is shut off to cool down the components. The hotter the temperature was set the longer the cooling fan needs to run to cool off the oven. This is normal.

Less Common

05 - LG Range/Stove/Oven High Limit Thermostat

The high limit thermostat sends voltage to the oven fan as the oven heats up. If the high limit thermostat is defective, it may keep sending voltage to the oven fan after the oven has cooled down. To determine if the high limit thermostat is at fault, use a multimeter to test the thermostat for continuity. If the high limit thermostat does not have continuity, replace it.

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Less Common

06 - LG Range/Stove/Oven Thermostat

The thermostat sends voltage to the oven fan as the oven heats up. If the thermostat contacts are stuck closed, the thermostat may continue to send voltage to the oven fan after the oven has cooled down. To determine if the thermostat is at fault, use a multimeter to test the thermostat for continuity. If the thermostat shows continuity at any temperature, this indicates that the thermostat is defective. If the thermostat is defective, replace it.

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Less Common

Frequently Asked Questions

Why does my LG oven fan keep running after I turn it off?

How do I know if the high-limit thermostat is causing my LG oven fan not to turn off?

Can a thermostat make my LG oven fan run continuously?

Is the LG oven control board the problem if the fan will not shut off?

How can I find the correct LG oven fan or thermostat replacement part?

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