diff --git a/Marlin/src/lcd/extensible_ui/ui_api.cpp b/Marlin/src/lcd/extensible_ui/ui_api.cpp
index 0871036118..b34a4b8238 100644
--- a/Marlin/src/lcd/extensible_ui/ui_api.cpp
+++ b/Marlin/src/lcd/extensible_ui/ui_api.cpp
@@ -170,12 +170,17 @@ namespace ExtUI {
 
   void enableHeater(const heater_t heater) {
     #if HEATER_IDLE_HANDLER
-      #if HAS_HEATED_BED
-        if (heater == BED)
-          thermalManager.reset_bed_idle_timer();
-        else
-      #endif
-          thermalManager.reset_heater_idle_timer(heater - H0);
+      switch (heater) {
+        #if HAS_HEATED_BED
+          case BED:
+            thermalManager.reset_bed_idle_timer();
+            return;
+        #endif
+        #if HAS_HEATED_CHAMBER
+          case CHAMBER: return; // Chamber has no idle timer
+        #endif
+        default: thermalManager.reset_heater_idle_timer(heater - H0);
+      }
     #endif
   }
 
@@ -188,23 +193,31 @@ namespace ExtUI {
   }
 
   bool isHeaterIdle(const heater_t heater) {
-    return (false
-      #if HEATER_IDLE_HANDLER
-        || (heater == BED ? (false
-          #if HAS_HEATED_BED
-            || thermalManager.bed_idle.timed_out
-          #endif
-        ) : thermalManager.hotend_idle[heater - H0].timed_out)
-      #endif
-    );
+    #if HEATER_IDLE_HANDLER
+      switch (heater) {
+        #if HAS_HEATED_BED
+          case BED: return thermalManager.bed_idle.timed_out;
+        #endif
+        #if HAS_HEATED_CHAMBER
+          case CHAMBER: return false; // Chamber has no idle timer
+        #endif
+        default: return thermalManager.hotend_idle[heater - H0].timed_out;
+      }
+    #else
+      return false;
+    #endif
   }
 
   float getActualTemp_celsius(const heater_t heater) {
-    return heater == BED ? (0
+    switch (heater) {
       #if HAS_HEATED_BED
-        + thermalManager.degBed()
+        case BED: return thermalManager.degBed();
       #endif
-    ) : thermalManager.degHotend(heater - H0);
+      #if HAS_HEATED_CHAMBER
+        case CHAMBER: return thermalManager.degChamber();
+      #endif
+      default: return thermalManager.degHotend(heater - H0);
+    }
   }
 
   float getActualTemp_celsius(const extruder_t extruder) {
@@ -212,11 +225,15 @@ namespace ExtUI {
   }
 
   float getTargetTemp_celsius(const heater_t heater) {
-    return heater == BED ? (0
+    switch (heater) {
       #if HAS_HEATED_BED
-        + thermalManager.degTargetBed()
+        case BED: return thermalManager.degTargetBed();
       #endif
-    ) : thermalManager.degTargetHotend(heater - H0);
+      #if HAS_HEATED_CHAMBER
+        case CHAMBER: return thermalManager.degTargetChamber();
+      #endif
+      default: return thermalManager.degTargetHotend(heater - H0);
+    }
   }
 
   float getTargetTemp_celsius(const extruder_t extruder) {
@@ -839,7 +856,7 @@ namespace ExtUI {
   }
 
   void stopPrint() {
-    ui.stop_print();
+    ui.abort_print();
   }
 
   FileList::FileList() { refresh(); }
diff --git a/Marlin/src/lcd/extensible_ui/ui_api.h b/Marlin/src/lcd/extensible_ui/ui_api.h
index cce012f38f..689300b8ea 100644
--- a/Marlin/src/lcd/extensible_ui/ui_api.h
+++ b/Marlin/src/lcd/extensible_ui/ui_api.h
@@ -54,7 +54,7 @@ namespace ExtUI {
 
   enum axis_t     : uint8_t { X, Y, Z };
   enum extruder_t : uint8_t { E0, E1, E2, E3, E4, E5 };
-  enum heater_t   : uint8_t { H0, H1, H2, H3, H4, H5, BED };
+  enum heater_t   : uint8_t { H0, H1, H2, H3, H4, H5, BED, CHAMBER };
   enum fan_t      : uint8_t { FAN0, FAN1, FAN2, FAN3, FAN4, FAN5 };
 
   constexpr uint8_t extruderCount = EXTRUDERS;
diff --git a/Marlin/src/lcd/ultralcd.cpp b/Marlin/src/lcd/ultralcd.cpp
index f0ebcefbb3..9cdcfbace6 100644
--- a/Marlin/src/lcd/ultralcd.cpp
+++ b/Marlin/src/lcd/ultralcd.cpp
@@ -1380,7 +1380,9 @@ void MarlinUI::update() {
   }
 
   void MarlinUI::pause_print() {
-    synchronize(PSTR(MSG_PAUSE_PRINT));
+    #if HAS_LCD_MENU
+      synchronize(PSTR(MSG_PAUSE_PRINT));
+    #endif
 
     #if ENABLED(POWER_LOSS_RECOVERY)
       if (recovery.enabled) recovery.save(true, false);
diff --git a/buildroot/share/tests/DUE-tests b/buildroot/share/tests/DUE-tests
index d13d9cc751..f793237cfb 100755
--- a/buildroot/share/tests/DUE-tests
+++ b/buildroot/share/tests/DUE-tests
@@ -7,7 +7,7 @@
 set -e
 
 restore_configs
-opt_set MOTHERBOARD BOARD_RAMPS4DUE_EFB
+opt_set MOTHERBOARD BOARD_RAMPS4DUE_EFB EXTENSIBLE_UI EXTUI_EXAMPLE
 opt_enable S_CURVE_ACCELERATION EEPROM_SETTINGS GCODE_MACROS
 opt_set E0_AUTO_FAN_PIN 8
 opt_set EXTRUDER_AUTO_FAN_SPEED 100