diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 0af5674df9..8aa51b49d2 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -123,7 +123,7 @@
  * :[2400, 9600, 19200, 38400, 57600, 115200, 250000, 500000, 1000000]
  */
 #define BAUDRATE 115200
-#define USB_BAUDRATE 230400
+//#define BAUDRATE 250000
 
 // Enable the Bluetooth serial interface on AT90USB devices
 //#define BLUETOOTH
@@ -428,7 +428,7 @@
 #define TEMP_SENSOR_7 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_PROBE 0
-#define TEMP_SENSOR_CHAMBER 1
+#define TEMP_SENSOR_CHAMBER 0
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
diff --git a/Marlin/src/MarlinCore.cpp b/Marlin/src/MarlinCore.cpp
index cd87a3b33f..29f2783b28 100644
--- a/Marlin/src/MarlinCore.cpp
+++ b/Marlin/src/MarlinCore.cpp
@@ -909,7 +909,7 @@ void setup() {
   #endif
 
   #if NUM_SERIAL > 0
-    MYSERIAL0.begin(USB_BAUDRATE);
+    MYSERIAL0.begin(BAUDRATE);
     uint32_t serial_connect_timeout = millis() + 1000UL;
     while (!MYSERIAL0 && PENDING(millis(), serial_connect_timeout)) { /*nada*/ }
     #if HAS_MULTI_SERIAL