diff --git a/Marlin/src/core/language.h b/Marlin/src/core/language.h
index c53ebdfbf8382..8e0784f70d767 100644
--- a/Marlin/src/core/language.h
+++ b/Marlin/src/core/language.h
@@ -105,6 +105,7 @@
 
 #define STR_ENQUEUEING                      "enqueueing \""
 #define STR_POWERUP                         "PowerUp"
+#define STR_POWEROFF                        "PowerOff"
 #define STR_EXTERNAL_RESET                  " External Reset"
 #define STR_BROWNOUT_RESET                  " Brown out Reset"
 #define STR_WATCHDOG_RESET                  " Watchdog Reset"
@@ -306,6 +307,7 @@
 #define STR_Z_PROBE_OFFSET                  "Z-Probe Offset"
 #define STR_TEMPERATURE_UNITS               "Temperature Units"
 #define STR_USER_THERMISTORS                "User thermistors"
+#define STR_DELAYED_POWEROFF                "Delayed poweroff"
 
 //
 // Endstop Names used by Endstops::report_states
diff --git a/Marlin/src/feature/power.cpp b/Marlin/src/feature/power.cpp
index 0e4d5452e4864..c2ed169aa809f 100644
--- a/Marlin/src/feature/power.cpp
+++ b/Marlin/src/feature/power.cpp
@@ -24,7 +24,9 @@
  * power.cpp - power control
  */
 
-#include "../inc/MarlinConfig.h"
+#include "../inc/MarlinConfigPre.h"
+
+#if EITHER(PSU_CONTROL, AUTO_POWER_CONTROL)
 
 #include "power.h"
 #include "../module/planner.h"
@@ -40,8 +42,6 @@
   #include "../gcode/gcode.h"
 #endif
 
-#if EITHER(PSU_CONTROL, AUTO_POWER_CONTROL)
-
 Power powerManager;
 bool Power::psu_on;
 
@@ -97,6 +97,10 @@ void Power::power_on() {
  * Processes any PSU_POWEROFF_GCODE and makes a PS_OFF_SOUND if enabled.
  */
 void Power::power_off() {
+  SERIAL_ECHOLNPGM(STR_POWEROFF);
+
+  TERN_(HAS_SUICIDE, suicide());
+
   if (!psu_on) return;
 
   #ifdef PSU_POWEROFF_GCODE
diff --git a/Marlin/src/gcode/control/M80_M81.cpp b/Marlin/src/gcode/control/M80_M81.cpp
index cbb3c85f40caa..6a3788c4a9190 100644
--- a/Marlin/src/gcode/control/M80_M81.cpp
+++ b/Marlin/src/gcode/control/M80_M81.cpp
@@ -107,7 +107,10 @@ void GcodeSuite::M81() {
     }
   #endif
 
-  if (delayed_power_off) return;
+  if (delayed_power_off) {
+    SERIAL_ECHOLNPGM(STR_DELAYED_POWEROFF);
+    return;
+  }
 
   #if HAS_SUICIDE
     suicide();
diff --git a/Marlin/src/libs/MAX31865.cpp b/Marlin/src/libs/MAX31865.cpp
index 6cc8ffca39903..1cafbe5f170e2 100644
--- a/Marlin/src/libs/MAX31865.cpp
+++ b/Marlin/src/libs/MAX31865.cpp
@@ -300,14 +300,14 @@ uint16_t MAX31865::readRaw() {
         enableBias();
         nextEventStamp = millis() + 11; // wait at least 11msec before enabling 1shot
         nextEvent = SETUP_1_SHOT_MODE;
-        DEBUG_ECHOLN("MAX31865 bias voltage enabled");
+        DEBUG_ECHOLNPGM("MAX31865 bias voltage enabled");
         break;
 
       case SETUP_1_SHOT_MODE:
         oneShot();
         nextEventStamp = millis() + 65; // wait at least 65msec before reading RTD register
         nextEvent = READ_RTD_REG;
-        DEBUG_ECHOLN("MAX31865 1 shot mode enabled");
+        DEBUG_ECHOLNPGM("MAX31865 1 shot mode enabled");
         break;
 
       case READ_RTD_REG: {
diff --git a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h
index 592d585982df7..5fdd37b104151 100644
--- a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h
+++ b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h
@@ -193,7 +193,9 @@
 //
 #if ENABLED(MKS_PWC)
   #if ENABLED(TFT_LVGL_UI)
-    #undef PSU_CONTROL
+    #if ENABLED(PSU_CONTROL)
+      #error "PSU_CONTROL is incompatible with MKS_PWC plus TFT_LVGL_UI."
+    #endif
     #undef MKS_PWC
     #define SUICIDE_PIN                     PB2
     #define SUICIDE_PIN_STATE               LOW
diff --git a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_common.h b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_common.h
index 859529c2c302d..e057e13c25f08 100644
--- a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_common.h
+++ b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_common.h
@@ -118,7 +118,9 @@
 //
 #if ENABLED(MKS_PWC)
   #if ENABLED(TFT_LVGL_UI)
-    #undef PSU_CONTROL
+    #if ENABLED(PSU_CONTROL)
+      #error "PSU_CONTROL is incompatible with MKS_PWC plus TFT_LVGL_UI."
+    #endif
     #undef MKS_PWC
     #define SUICIDE_PIN                     PB2
     #define SUICIDE_PIN_STATE               LOW
diff --git a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_PRO.h b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_PRO.h
index a738a4faa2593..53f207adb7ab8 100644
--- a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_PRO.h
+++ b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_PRO.h
@@ -185,7 +185,9 @@
 //
 #if ENABLED(MKS_PWC)
   #if ENABLED(TFT_LVGL_UI)
-    #undef PSU_CONTROL
+    #if ENABLED(PSU_CONTROL)
+      #error "PSU_CONTROL is incompatible with MKS_PWC plus TFT_LVGL_UI."
+    #endif
     #undef MKS_PWC
     #define SUICIDE_PIN                     PG11
     #define SUICIDE_PIN_STATE               LOW
diff --git a/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3_common.h b/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3_common.h
index 2c191946cd525..5b2c1b0f4345f 100644
--- a/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3_common.h
+++ b/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3_common.h
@@ -165,7 +165,9 @@
 //
 #if ENABLED(MKS_PWC)
   #if ENABLED(TFT_LVGL_UI)
-    #undef PSU_CONTROL
+    #if ENABLED(PSU_CONTROL)
+      #error "PSU_CONTROL is incompatible with MKS_PWC plus TFT_LVGL_UI."
+    #endif
     #undef MKS_PWC
     #define SUICIDE_PIN                     PB2
     #define SUICIDE_PIN_STATE               LOW