diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index a6fd833a96..8b084797dc 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -536,7 +536,7 @@
  *   999 : Dummy Table that ALWAYS reads 100°C or the temperature defined below.
  *
  */
-#define TEMP_SENSOR_0 1
+#define TEMP_SENSOR_0 999
 #define TEMP_SENSOR_1 0
 #define TEMP_SENSOR_2 0
 #define TEMP_SENSOR_3 0