diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 379234f..64740bf 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -1718,8 +1718,6 @@ static_assert(hbm[Z_AXIS] >= 0, "HOMING_BUMP_MM.Z must be greater than or equal
   #error "MAX6675_SS_PIN (required for TEMP_SENSOR_0) not defined for this board."
 #elif HOTENDS && !HAS_TEMP_HOTEND
   #error "TEMP_0_PIN (required for TEMP_SENSOR_0) not defined for this board."
-#elif EITHER(HAS_MULTI_HOTEND, HEATERS_PARALLEL) && !HAS_HEATER_1
-  #error "HEATER_1_PIN not defined for this board."
 #endif
 
 #if HAS_MULTI_HOTEND
diff --git a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h
index 5784e96..c71275c 100644
--- a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h
+++ b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h
@@ -27,8 +27,6 @@
 
 #ifndef __STM32F1__
   #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
-#elif HOTENDS > 2 || E_STEPPERS > 2
-  #error "MKS Robin nano supports up to 2 hotends / E-steppers. Comment out this line to continue."
 #endif
 
 #define BOARD_INFO_NAME "MKS Robin nano"
@@ -232,6 +230,7 @@
 #if HOTENDS == 1                                  
   #ifndef FAN1_PIN
     #define FAN1_PIN                        PB0
+    #define HEATER_1_PIN                    PC3
   #endif
 #else
   #ifndef HEATER_1_PIN