diff --git a/Marlin/src/inc/Conditionals_adv.h b/Marlin/src/inc/Conditionals_adv.h
index 745b2eb9fa0a..10e3bf046fae 100644
--- a/Marlin/src/inc/Conditionals_adv.h
+++ b/Marlin/src/inc/Conditionals_adv.h
@@ -364,12 +364,12 @@
   #define TEMP_SENSOR_0_IS_AD8495 1
 #elif TEMP_SENSOR_0 == -1
   #define TEMP_SENSOR_0_IS_AD595 1
-#elif TEMP_SENSOR_0 == 998 || TEMP_SENSOR_0 == 999
-  #define TEMP_SENSOR_0_IS_DUMMY 1
 #elif TEMP_SENSOR_0 > 0
   #define TEMP_SENSOR_0_IS_THERMISTOR 1
   #if TEMP_SENSOR_0 == 1000
     #define TEMP_SENSOR_0_IS_CUSTOM 1
+  #elif TEMP_SENSOR_0 == 998 || TEMP_SENSOR_0 == 999
+    #define TEMP_SENSOR_0_IS_DUMMY 1
   #endif
 #endif
 
@@ -407,12 +407,12 @@
   #define TEMP_SENSOR_1_IS_AD8495 1
 #elif TEMP_SENSOR_1 == -1
   #define TEMP_SENSOR_1_IS_AD595 1
-#elif TEMP_SENSOR_1 == 998 || TEMP_SENSOR_1 == 999
-  #define TEMP_SENSOR_1_IS_DUMMY 1
 #elif TEMP_SENSOR_1 > 0
   #define TEMP_SENSOR_1_IS_THERMISTOR 1
   #if TEMP_SENSOR_1 == 1000
     #define TEMP_SENSOR_1_IS_CUSTOM 1
+  #elif TEMP_SENSOR_1 == 998 || TEMP_SENSOR_1 == 999
+    #define TEMP_SENSOR_1_IS_DUMMY 1
   #endif
 #endif
 
@@ -450,57 +450,57 @@
   #define TEMP_SENSOR_2_IS_AD8495 1
 #elif TEMP_SENSOR_2 == -1
   #define TEMP_SENSOR_2_IS_AD595 1
-#elif TEMP_SENSOR_2 == 998 || TEMP_SENSOR_2 == 999
-  #define TEMP_SENSOR_2_IS_DUMMY 1
 #elif TEMP_SENSOR_2 > 0
   #define TEMP_SENSOR_2_IS_THERMISTOR 1
   #if TEMP_SENSOR_2 == 1000
     #define TEMP_SENSOR_2_IS_CUSTOM 1
+  #elif TEMP_SENSOR_2 == 998 || TEMP_SENSOR_2 == 999
+    #define TEMP_SENSOR_2_IS_DUMMY 1
   #endif
 #endif
 
-#if TEMP_SENSOR_3 == 998 || TEMP_SENSOR_3 == 999
-  #define TEMP_SENSOR_3_IS_DUMMY 1
-#elif TEMP_SENSOR_3 > 0
+#if TEMP_SENSOR_3 > 0
   #define TEMP_SENSOR_3_IS_THERMISTOR 1
   #if TEMP_SENSOR_3 == 1000
     #define TEMP_SENSOR_3_IS_CUSTOM 1
+  #elif TEMP_SENSOR_3 == 998 || TEMP_SENSOR_3 == 999
+    #define TEMP_SENSOR_3_IS_DUMMY 1
   #endif
 #endif
 
-#if TEMP_SENSOR_4 == 998 || TEMP_SENSOR_4 == 999
-  #define TEMP_SENSOR_4_IS_DUMMY 1
-#elif TEMP_SENSOR_4 > 0
+#if TEMP_SENSOR_4 > 0
   #define TEMP_SENSOR_4_IS_THERMISTOR 1
   #if TEMP_SENSOR_4 == 1000
     #define TEMP_SENSOR_4_IS_CUSTOM 1
+  #elif TEMP_SENSOR_4 == 998 || TEMP_SENSOR_4 == 999
+    #define TEMP_SENSOR_4_IS_DUMMY 1
   #endif
 #endif
 
-#if TEMP_SENSOR_5 == 998 || TEMP_SENSOR_5 == 999
-  #define TEMP_SENSOR_5_IS_DUMMY 1
-#elif TEMP_SENSOR_5 > 0
+#if TEMP_SENSOR_5 > 0
   #define TEMP_SENSOR_5_IS_THERMISTOR 1
   #if TEMP_SENSOR_5 == 1000
     #define TEMP_SENSOR_5_IS_CUSTOM 1
+  #elif TEMP_SENSOR_5 == 998 || TEMP_SENSOR_5 == 999
+    #define TEMP_SENSOR_5_IS_DUMMY 1
   #endif
 #endif
 
-#if TEMP_SENSOR_6 == 998 || TEMP_SENSOR_6 == 999
-  #define TEMP_SENSOR_6_IS_DUMMY 1
-#elif TEMP_SENSOR_6 > 0
+#if TEMP_SENSOR_6 > 0
   #define TEMP_SENSOR_6_IS_THERMISTOR 1
   #if TEMP_SENSOR_6 == 1000
     #define TEMP_SENSOR_6_IS_CUSTOM 1
+  #elif TEMP_SENSOR_6 == 998 || TEMP_SENSOR_6 == 999
+    #define TEMP_SENSOR_6_IS_DUMMY 1
   #endif
 #endif
 
-#if TEMP_SENSOR_7 == 998 || TEMP_SENSOR_7 == 999
-  #define TEMP_SENSOR_7_IS_DUMMY 1
-#elif TEMP_SENSOR_7 > 0
+#if TEMP_SENSOR_7 > 0
   #define TEMP_SENSOR_7_IS_THERMISTOR 1
   #if TEMP_SENSOR_7 == 1000
     #define TEMP_SENSOR_7_IS_CUSTOM 1
+  #elif TEMP_SENSOR_7 == 998 || TEMP_SENSOR_7 == 999
+    #define TEMP_SENSOR_7_IS_DUMMY 1
   #endif
 #endif
 
@@ -680,12 +680,12 @@
   #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_BED."
 #elif TEMP_SENSOR_BED == -1
   #define TEMP_SENSOR_BED_IS_AD595 1
-#elif TEMP_SENSOR_BED == 998 || TEMP_SENSOR_BED == 999
-  #define TEMP_SENSOR_BED_IS_DUMMY 1
 #elif TEMP_SENSOR_BED > 0
   #define TEMP_SENSOR_BED_IS_THERMISTOR 1
   #if TEMP_SENSOR_BED == 1000
     #define TEMP_SENSOR_BED_IS_CUSTOM 1
+  #elif TEMP_SENSOR_BED == 998 || TEMP_SENSOR_BED == 999
+    #define TEMP_SENSOR_BED_IS_DUMMY 1
   #endif
 #else
   #undef BED_MINTEMP
@@ -700,12 +700,12 @@
   #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_CHAMBER."
 #elif TEMP_SENSOR_CHAMBER == -1
   #define TEMP_SENSOR_CHAMBER_IS_AD595 1
-#elif TEMP_SENSOR_CHAMBER == 998 || TEMP_SENSOR_CHAMBER == 999
-  #define TEMP_SENSOR_CHAMBER_IS_DUMMY 1
 #elif TEMP_SENSOR_CHAMBER > 0
   #define TEMP_SENSOR_CHAMBER_IS_THERMISTOR 1
   #if TEMP_SENSOR_CHAMBER == 1000
     #define TEMP_SENSOR_CHAMBER_IS_CUSTOM 1
+  #elif TEMP_SENSOR_CHAMBER == 998 || TEMP_SENSOR_CHAMBER == 999
+    #define TEMP_SENSOR_CHAMBER_IS_DUMMY 1
   #endif
 #else
   #undef THERMAL_PROTECTION_CHAMBER
@@ -742,12 +742,12 @@
   #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_PROBE."
 #elif TEMP_SENSOR_PROBE == -1
   #define TEMP_SENSOR_PROBE_IS_AD595 1
-#elif TEMP_SENSOR_PROBE == 998 || TEMP_SENSOR_PROBE == 999
-  #define TEMP_SENSOR_PROBE_IS_DUMMY 1
 #elif TEMP_SENSOR_PROBE > 0
   #define TEMP_SENSOR_PROBE_IS_THERMISTOR 1
   #if TEMP_SENSOR_PROBE == 1000
     #define TEMP_SENSOR_PROBE_IS_CUSTOM 1
+  #elif TEMP_SENSOR_PROBE == 998 || TEMP_SENSOR_PROBE == 999
+    #define TEMP_SENSOR_PROBE_IS_DUMMY 1
   #endif
 #endif
 
@@ -759,12 +759,12 @@
   #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_BOARD."
 #elif TEMP_SENSOR_BOARD == -1
   #define TEMP_SENSOR_BOARD_IS_AD595 1
-#elif TEMP_SENSOR_BOARD == 998 || TEMP_SENSOR_BOARD == 999
-  #define TEMP_SENSOR_BOARD_IS_DUMMY 1
 #elif TEMP_SENSOR_BOARD > 0
   #define TEMP_SENSOR_BOARD_IS_THERMISTOR 1
   #if TEMP_SENSOR_BOARD == 1000
     #define TEMP_SENSOR_BOARD_IS_CUSTOM 1
+  #elif TEMP_SENSOR_BOARD == 998 || TEMP_SENSOR_BOARD == 999
+    #define TEMP_SENSOR_BOARD_IS_DUMMY 1
   #endif
 #endif
 
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 1a59104587f9..72b7c1bc243f 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -2957,7 +2957,7 @@ void Temperature::init() {
         temp_range[NR].raw_max -= TEMPDIR(NR) * (OVERSAMPLENR); \
     }while(0)
 
-    #define _MINMAX_TEST(N,M) (HOTENDS > N && TEMP_SENSOR_##N##_IS_THERMISTOR && defined(HEATER_##N##_##M##TEMP))
+    #define _MINMAX_TEST(N,M) (!TEMP_SENSOR_##N##_IS_DUMMY && HOTENDS > N && TEMP_SENSOR_##N##_IS_THERMISTOR && defined(HEATER_##N##_##M##TEMP))
 
     #if _MINMAX_TEST(0, MIN)
       _TEMP_MIN_E(0);