Index: firmware/App/Modes/FPModes/ModeGenPermeateDefeatured.c
===================================================================
diff -u -r830213bc6dcc1a684610caf78c79d55f2cb41e93 -r47a7b0fce13cf38919932a8662c378f4f6a8b9f3
--- firmware/App/Modes/FPModes/ModeGenPermeateDefeatured.c	(.../ModeGenPermeateDefeatured.c)	(revision 830213bc6dcc1a684610caf78c79d55f2cb41e93)
+++ firmware/App/Modes/FPModes/ModeGenPermeateDefeatured.c	(.../ModeGenPermeateDefeatured.c)	(revision 47a7b0fce13cf38919932a8662c378f4f6a8b9f3)
@@ -8,7 +8,7 @@
 * @file    ModeGenPermeateDefeatured.c
 *
 * @author  (last)      “rkallala”
-* @date    (last)      09-Dec-2025
+* @date    (last)      15-Jan-2026
 *
 * @author  (original)  Michael Garthwaite
 * @date    (original)  08-Sep-2025
@@ -21,7 +21,9 @@
 #include "MessageSupport.h"
 #include "ModeGenPermeateDefeatured.h"
 #include "ModePreGenPermeateDefeatured.h"
+#include "PersistentAlarm.h"
 #include "TaskGeneral.h"
+#include "Temperature.h"
 #include "Timers.h"
 #include "Valves.h"
 #include "WaterQualityMonitor.h"
@@ -34,6 +36,7 @@
 // ********** private definitions **********
 
 #define PRE_GEN_DEF_PERMEATE_DATA_PUBLISH_INTERVAL     ( MS_PER_SECOND / TASK_GENERAL_INTERVAL )   ///< Interval (ms/task time) at which the gen permeate mode data published.
+#define INLET_TEMPERATURE_LOW_THRESHOLD_C              5.0F                                        ///< Minimum allowed Inlet temperature in C.
 
 // ********** private data **********
 
@@ -122,6 +125,9 @@
 
     checkInletPressures();
 
+    // check inlet temperature D1
+    checkInletTemperatures();
+
     //Publish Gen Permeate mode data
     publishGenPDefModeData();