If the Frigidaire microwave exhaust fan continues to run after replacing the thermostat, you can try the following steps to fix it:
Ensure the thermostat is installed correctly and compatible with your specific microwave model.
Double-check the wiring connections for the new thermostat. Make sure all connections are secure and properly seated.
Check if there are any additional switches or controls related to the exhaust fan that may be malfunctioning or stuck in the ON position. Inspect and test these components for proper operation.
Reset the microwave by unplugging it from the power source for a few minutes, then plug it back in. This can sometimes reset the control board and resolve minor issues.
If the exhaust fan still won't turn off, it is recommended to contact Frigidaire customer support or schedule a service appointment with a qualified technician. They will have the expertise to diagnose the specific issue with your microwave and provide appropriate solutions.