When your Universal range, stove, or oven fan won't turn off, a stuck relay in the oven control board is a likely cause. The relay can remain closed and send continuous voltage to the fan circuit even after the oven is turned off. Check the wiring diagram and test the oven thermostats before replacing the board, since a failed thermostat can also keep the fan running. A defective main control board can cause the same problem when its fan relay shorts closed. Keep in mind that the cooling fan may run for more than an hour after cooking, especially after a high-temperature cycle. That is normal while the oven cools. If the oven fan keeps running after the oven has cooled completely, test the high-limit thermostat with a multimeter. A high-limit thermostat or thermostat that sends voltage when it should not is defective and should be replaced. Use your model number to find the exact oven control board, main control board, high-limit thermostat, or thermostat for your specific appliance, and to make sure the replacement part fits.
01 - Universal 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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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.
03 - Universal 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.
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 - Universal 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.
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.