Keep getting a E-2 when I try to start up my stove. The fire seems to be burning good and fan comes on but then it shuts down. Checked the error code and in troubleshooting it says the likely issue is a disconnected heat sensor. Can someone tell me where the heat sensor is and how to check it? I just did a hard reset of the board and have it set on mode C and bottom buttons at 6-4-1. Thanks.