diff --git a/Firmware/Marlin_main.cpp b/Firmware/Marlin_main.cpp
index d0ee5a3b9..95ea92e1a 100755
--- a/Firmware/Marlin_main.cpp
+++ b/Firmware/Marlin_main.cpp
@@ -9445,7 +9445,7 @@ void manage_inactivity(bool ignore_stepper_queue/*=false*/) //default argument s
 {
 #ifdef FILAMENT_SENSOR
 bool bInhibitFlag;
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 static uint8_t nFSCheckCount=0;
 #endif // IR_SENSOR_ANALOG
 
@@ -9457,7 +9457,7 @@ static uint8_t nFSCheckCount=0;
 #endif // PAT9125
 #ifdef IR_SENSOR
           bInhibitFlag=(menu_menu==lcd_menu_show_sensors_state); // Support::SensorInfo menu active
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
           bInhibitFlag=bInhibitFlag||bMenuFSDetect; // Settings::HWsetup::FSdetect menu active
 #endif // IR_SENSOR_ANALOG
 #endif // IR_SENSOR
@@ -9465,7 +9465,7 @@ static uint8_t nFSCheckCount=0;
 		{
 			if (!moves_planned() && !IS_SD_PRINTING && !is_usb_printing && (lcd_commands_type != LcdCommands::Layer1Cal) && ! eeprom_read_byte((uint8_t*)EEPROM_WIZARD_ACTIVE))
 			{
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
                     bool bTemp=current_voltage_raw_IR>IRsensor_Hmin_TRESHOLD;
                     bTemp=bTemp&&current_voltage_raw_IR<IRsensor_Hopen_TRESHOLD;
                     bTemp=bTemp&&(!CHECK_ALL_HEATERS);
diff --git a/Firmware/config.h b/Firmware/config.h
index ab93d798b..c100df62b 100644
--- a/Firmware/config.h
+++ b/Firmware/config.h
@@ -5,10 +5,12 @@
 #include "Configuration_prusa.h"
 #include "pins.h"
 
-#define IR_SENSOR_ANALOG (defined(VOLT_IR_PIN) && defined(IR_SENSOR))
+#if (defined(VOLT_IR_PIN) && defined(IR_SENSOR))
+# define IR_SENSOR_ANALOG
+#endif
 
 //ADC configuration
-#if !IR_SENSOR_ANALOG
+#ifndef IR_SENSOR_ANALOG
 #define ADC_CHAN_MSK      0b0000001001011111 //used AD channels bit mask (0,1,2,3,4,6,9)
 #define ADC_DIDR_MSK      0b0000001001011111 //AD channels DIDR mask (1 ~ disabled digital input)
 #define ADC_CHAN_CNT      7         //number of used channels)
diff --git a/Firmware/fsensor.cpp b/Firmware/fsensor.cpp
index 64b46b30c..7c9dd856d 100755
--- a/Firmware/fsensor.cpp
+++ b/Firmware/fsensor.cpp
@@ -111,7 +111,7 @@ int16_t fsensor_oq_yd_max;
 uint16_t fsensor_oq_sh_sum;
 //! @}
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 ClFsensorPCB oFsensorPCB;
 ClFsensorActionNA oFsensorActionNA;
 bool bIRsensorStateFlag=false;
@@ -160,7 +160,7 @@ void fsensor_init(void)
 		fsensor_not_responding = true;
 	}
 #endif //PAT9125
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
      bIRsensorStateFlag=false;
      oFsensorPCB=(ClFsensorPCB)eeprom_read_byte((uint8_t*)EEPROM_FSENSOR_PCB);
      oFsensorActionNA=(ClFsensorActionNA)eeprom_read_byte((uint8_t*)EEPROM_FSENSOR_ACTION_NA);
@@ -170,7 +170,7 @@ void fsensor_init(void)
 	else
 		fsensor_disable(false);                 // (in this case) EEPROM update is not necessary
 	printf_P(PSTR("FSensor %S"), (fsensor_enabled?PSTR("ENABLED"):PSTR("DISABLED")));
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
      printf_P(PSTR(" (sensor board revision: %S)\n"),(oFsensorPCB==ClFsensorPCB::_Rev03b)?PSTR("03b or newer"):PSTR("03 or older"));
 #else //IR_SENSOR_ANALOG
      printf_P(PSTR("\n"));
@@ -204,7 +204,7 @@ bool fsensor_enable(bool bUpdateEEPROM)
 		FSensorStateMenu = 1;
 	}
 #else // PAT9125
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
      if(!fsensor_IR_check())
           {
           bUpdateEEPROM=true;
@@ -217,7 +217,7 @@ bool fsensor_enable(bool bUpdateEEPROM)
      fsensor_enabled=true;
      fsensor_not_responding=false;
      FSensorStateMenu=1;
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
           }
 #endif //IR_SENSOR_ANALOG
      if(bUpdateEEPROM)
@@ -608,7 +608,7 @@ void fsensor_update(void)
         {
                if(digitalRead(IR_SENSOR_PIN))
                {                                  // IR_SENSOR_PIN ~ H
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
                     if(!bIRsensorStateFlag)
                     {
                          bIRsensorStateFlag=true;
@@ -651,7 +651,7 @@ void fsensor_update(void)
 #endif //IR_SENSOR_ANALOG
                                   fsensor_checkpoint_print();
                                   fsensor_enque_M600();
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
                               }
                          }
                     }
@@ -665,7 +665,7 @@ void fsensor_update(void)
 #endif //PAT9125
 }
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 bool fsensor_IR_check()
 {
 uint16_t volt_IR_int;
diff --git a/Firmware/fsensor.h b/Firmware/fsensor.h
index 5ed7f7fc8..289bda7cc 100755
--- a/Firmware/fsensor.h
+++ b/Firmware/fsensor.h
@@ -72,7 +72,7 @@ extern void fsensor_st_block_chunk(int cnt);
 //! @}
 
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 #define IR_SENSOR_STEADY 10                       // [ms]
 
 enum class ClFsensorPCB:uint_least8_t
diff --git a/Firmware/temperature.cpp b/Firmware/temperature.cpp
index b8c4fc27f..e6e3f0d7f 100755
--- a/Firmware/temperature.cpp
+++ b/Firmware/temperature.cpp
@@ -73,7 +73,7 @@ int current_voltage_raw_pwr = 0;
 int current_voltage_raw_bed = 0;
 #endif
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 int current_voltage_raw_IR = 0;
 #endif //IR_SENSOR_ANALOG
 
@@ -1595,7 +1595,7 @@ void adc_ready(void) //callback from adc when sampling finished
 #ifdef VOLT_BED_PIN
 	current_voltage_raw_bed = adc_values[ADC_PIN_IDX(VOLT_BED_PIN)]; // 6->9
 #endif
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
      current_voltage_raw_IR = adc_values[ADC_PIN_IDX(VOLT_IR_PIN)];
 #endif //IR_SENSOR_ANALOG
 	temp_meas_ready = true;
diff --git a/Firmware/temperature.h b/Firmware/temperature.h
index ba56e6819..94e11a2fc 100755
--- a/Firmware/temperature.h
+++ b/Firmware/temperature.h
@@ -78,7 +78,7 @@ extern int current_voltage_raw_pwr;
 extern int current_voltage_raw_bed;
 #endif
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 extern int current_voltage_raw_IR;
 #endif //IR_SENSOR_ANALOG
 
diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index c23f2a236..dc4fa56bb 100755
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -68,7 +68,7 @@ uint8_t SilentModeMenu_MMU = 1; //activate mmu unit stealth mode
 
 int8_t FSensorStateMenu = 1;
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 bool bMenuFSDetect=false;
 #endif //IR_SENSOR_ANALOG
 
@@ -239,7 +239,7 @@ static FanCheck lcd_selftest_fan_auto(int _fan);
 static bool lcd_selftest_fsensor();
 #endif //PAT9125
 static bool selftest_irsensor();
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 static bool lcd_selftest_IRsensor(bool bStandalone=false);
 static void lcd_detect_IRsensor();
 #endif //IR_SENSOR_ANALOG
@@ -1945,7 +1945,7 @@ static void lcd_menu_temperatures()
     menu_back_if_clicked();
 }
 
-#if defined (VOLT_BED_PIN) || defined (VOLT_PWR_PIN) || IR_SENSOR_ANALOG
+#if defined (VOLT_BED_PIN) || defined (VOLT_PWR_PIN) || defined(IR_SENSOR_ANALOG)
 #define VOLT_DIV_R1 10000
 #define VOLT_DIV_R2 2370
 #define VOLT_DIV_FAC ((float)VOLT_DIV_R2 / (VOLT_DIV_R2 + VOLT_DIV_R1))
@@ -1957,27 +1957,24 @@ static void lcd_menu_temperatures()
 //! |                    |
 //! | PWR:         00.0V |	c=12 r=1
 //! | Bed:         00.0V |	c=12 r=1
-//! |                    |
+//! | IR :         00.0V |  c=12 r=1 optional
 //! ----------------------
 //! @endcode
 //! @todo Positioning of the messages and values on LCD aren't fixed to their exact place. This causes issues with translations.
 static void lcd_menu_voltages()
 {
-	lcd_timeoutToStatus.stop(); //infinite timeout
-	float volt_pwr = VOLT_DIV_REF * ((float)current_voltage_raw_pwr / (1023 * OVERSAMPLENR)) / VOLT_DIV_FAC;
-	float volt_bed = VOLT_DIV_REF * ((float)current_voltage_raw_bed / (1023 * OVERSAMPLENR)) / VOLT_DIV_FAC;
-	lcd_home();
-#if !IR_SENSOR_ANALOG
-	lcd_printf_P(PSTR("\n"));
-#endif //!IR_SENSOR_ANALOG
-     lcd_printf_P(PSTR(" PWR:      %4.1fV\n" " BED:      %4.1fV"), volt_pwr, volt_bed);
-#if IR_SENSOR_ANALOG
-     float volt_IR = VOLT_DIV_REF * ((float)current_voltage_raw_IR / (1023 * OVERSAMPLENR));
-     lcd_printf_P(PSTR("\n IR :       %3.1fV"),volt_IR);
+    lcd_timeoutToStatus.stop(); //infinite timeout
+    float volt_pwr = VOLT_DIV_REF * ((float)current_voltage_raw_pwr / (1023 * OVERSAMPLENR)) / VOLT_DIV_FAC;
+    float volt_bed = VOLT_DIV_REF * ((float)current_voltage_raw_bed / (1023 * OVERSAMPLENR)) / VOLT_DIV_FAC;
+    lcd_home();
+    lcd_printf_P(PSTR(" PWR:      %4.1fV\n" " BED:      %4.1fV"), volt_pwr, volt_bed);
+#ifdef IR_SENSOR_ANALOG
+    float volt_IR = VOLT_DIV_REF * ((float)current_voltage_raw_IR / (1023 * OVERSAMPLENR));
+    lcd_printf_P(PSTR("\n IR :       %3.1fV"),volt_IR);
 #endif //IR_SENSOR_ANALOG
-     menu_back_if_clicked();
+    menu_back_if_clicked();
 }
-#endif //defined (VOLT_BED_PIN) || defined (VOLT_PWR_PIN) || IR_SENSOR_ANALOG
+#endif //defined (VOLT_BED_PIN) || defined (VOLT_PWR_PIN) || defined(IR_SENSOR_ANALOG)
 
 #ifdef TMC2130
 //! @brief Show Belt Status
@@ -2151,7 +2148,7 @@ static void lcd_support_menu()
   MENU_ITEM_BACK_P(_i("Date:"));////MSG_DATE c=17 r=1
   MENU_ITEM_BACK_P(PSTR(__DATE__));
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
   MENU_ITEM_BACK_P(STR_SEPARATOR);
   MENU_ITEM_BACK_P(PSTR("Fil. sensor v.:"));
   switch(oFsensorPCB)
@@ -5653,7 +5650,7 @@ SETTINGS_VERSION;
 MENU_END();
 }
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 static void lcd_fsensor_actionNA_set(void)
 {
 switch(oFsensorActionNA)
@@ -5719,7 +5716,7 @@ void lcd_hw_setup_menu(void)                      // can not be "static"
     SETTINGS_NOZZLE;
     MENU_ITEM_SUBMENU_P(_i("Checks"), lcd_checking_menu);
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
     FSENSOR_ACTION_NA;
     MENU_ITEM_FUNCTION_P(PSTR("FS Detect"), lcd_detect_IRsensor);
 #endif //IR_SENSOR_ANALOG
@@ -7140,7 +7137,7 @@ static void lcd_tune_menu()
 	else {
 		MENU_ITEM_TOGGLE_P(_T(MSG_FSENSOR), _T(MSG_ON), lcd_fsensor_state_set);
 	}
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
      FSENSOR_ACTION_NA;
 #endif //IR_SENSOR_ANALOG
 #endif //FILAMENT_SENSOR
@@ -7520,7 +7517,7 @@ void lcd_belttest()
 }
 #endif //TMC2130
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 static bool lcd_selftest_IRsensor(bool bStandalone)
 {
 bool bAction;
@@ -7586,7 +7583,7 @@ bool lcd_selftest()
 	int _progress = 0;
 	bool _result = true;
 	bool _swapped_fan = false;
-//#if IR_SENSOR_ANALOG
+//#ifdef IR_SENSOR_ANALOG
 #if (0)
      bool bAction;
      bAction=lcd_show_fullscreen_message_yes_no_and_wait_P(_i("Is the filament unloaded?"),false,true);
@@ -7796,7 +7793,7 @@ bool lcd_selftest()
 				_progress = lcd_selftest_screen(TestScreen::FsensorOk, _progress, 3, true, 2000); //fil sensor OK
 			}
 #endif //PAT9125
-//#if IR_SENSOR_ANALOG
+//#ifdef IR_SENSOR_ANALOG
 #if (0)
 			_progress = lcd_selftest_screen(TestScreen::Fsensor, _progress, 3, true, 2000); //check filament sensor
                _result = lcd_selftest_IRsensor();
diff --git a/Firmware/ultralcd.h b/Firmware/ultralcd.h
index ca64659ae..d82d71d90 100755
--- a/Firmware/ultralcd.h
+++ b/Firmware/ultralcd.h
@@ -140,7 +140,7 @@ extern uint8_t farm_status;
 #define SILENT_MODE_OFF SILENT_MODE_POWER
 #endif
 
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 extern bool bMenuFSDetect;
 #endif //IR_SENSOR_ANALOG
 
@@ -257,7 +257,7 @@ enum class WizState : uint8_t
 void lcd_wizard(WizState state);
 
 #define VOLT_DIV_REF 5
-#if IR_SENSOR_ANALOG
+#ifdef IR_SENSOR_ANALOG
 #define IRsensor_Hmin_TRESHOLD (3.0*1023*OVERSAMPLENR/VOLT_DIV_REF) // ~3.0V (0.6*Vcc)
 #define IRsensor_Lmax_TRESHOLD (1.5*1023*OVERSAMPLENR/VOLT_DIV_REF) // ~1.5V (0.3*Vcc)
 #define IRsensor_Hopen_TRESHOLD (4.6*1023*OVERSAMPLENR/VOLT_DIV_REF) // ~4.6V (N.C. @ Ru~20-50k, Rd'=56k, Ru'=10k)