Index: firmware/App/HDCommon.h
===================================================================
diff -u -re8077ba40df2e54d7d24e88337d48a3e31831b84 -r3fc7bce6763882c932a7da457fff2d9747b38be2
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision e8077ba40df2e54d7d24e88337d48a3e31831b84)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 3fc7bce6763882c932a7da457fff2d9747b38be2)
@@ -10,8 +10,8 @@
 * @author  (last)      Sean Nash
 * @date    (last)      24-Aug-2023
 *
-* @author  (original)  Sean
-* @date    (original)  27-Feb-2020
+* @author  (original) Sean
+* @date    (original) 27-Feb-2020
 *
 ***************************************************************************/
 
@@ -25,7 +25,7 @@
 #define HD_VERSION_MAJOR        0
 #define HD_VERSION_MINOR        9
 #define HD_VERSION_MICRO        0
-#define HD_VERSION_BUILD        295
+#define HD_VERSION_BUILD        798
 
 // ********** development build switches **********
 
Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r28e7d73ed933961eaa28f901199e34f7cca232ac -r3fc7bce6763882c932a7da457fff2d9747b38be2
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 28e7d73ed933961eaa28f901199e34f7cca232ac)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 3fc7bce6763882c932a7da457fff2d9747b38be2)
@@ -76,6 +76,9 @@
 /// Interval (in task intervals) at which to publish standby mode data to CAN bus.
 static OVERRIDE_U32_T standbyModePublishInterval = { DISINFECTS_DATA_PUB_INTERVAL, DISINFECTS_DATA_PUB_INTERVAL, DISINFECTS_DATA_PUB_INTERVAL, 0 };
 
+static const U32 SERVICE_TIME_INTERVAL_S = (U32)( 365 * 0.5 * SECONDS_IN_A_DAY );              ///< HD/DG 6-month service interval in seconds.
+static BOOL homingInitiated;                                                                   ///< Flag indicates actuator homing has been initiated from standby mode.
+
 // ********** private function prototypes **********
 
 static HD_STANDBY_STATE_T handleStandbyModeStartState( void );
Index: firmware/App/Services/AlarmMgmt.c
===================================================================
diff -u -rf7bddc13e4e585c784b156fa84a2b86398962f07 -r3fc7bce6763882c932a7da457fff2d9747b38be2
--- firmware/App/Services/AlarmMgmt.c	(.../AlarmMgmt.c)	(revision f7bddc13e4e585c784b156fa84a2b86398962f07)
+++ firmware/App/Services/AlarmMgmt.c	(.../AlarmMgmt.c)	(revision 3fc7bce6763882c932a7da457fff2d9747b38be2)
@@ -260,6 +260,33 @@
 
 /*********************************************************************//**
  * @brief
+ * The isACPowerLost function determines whether A/C power loss has
+ * been detected. This function sets the alarms blocked condition to
+ * allow smooth alarm recovery.
+ *
+ * @details Inputs: alarmStatus
+ * @details Outputs: alarmsBlockedTimer
+ * @return TRUE if A/C power loss alarm is in effect, FALSE if not
+ *************************************************************************/
+BOOL isACPowerLost( void )
+{
+    BOOL result = TRUE;
+
+    // Continue to block new alarms until the alarms are cleared.
+    if ( ( FALSE == isAlarmConditionDetected( ALARM_ID_HD_AC_POWER_LOST ) ) &&
+         ( FALSE == isAlarmConditionDetected( ALARM_ID_HD_AC_POWER_LOST_IN_TREATMENT ) ) )
+    {
+        result = FALSE;
+    }
+    else
+    {
+        alarmsBlockedTimer = ALARM_BLOCKED_COUNT_AFTER_AC_RETURN;
+    }
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The activateAlarm function activates a given alarm.
  * @details Inputs: none
  * @details Outputs: alarmIsActive[], alarmStartedAt[], alarmStatus is updated
@@ -268,6 +295,11 @@
  *************************************************************************/
 static void activateAlarm( ALARM_ID_T alarm )
 {
+    // Block new alarms, occuring during loss of AC power
+    if ( ( TRUE == getCPLDACPowerLossDetected() ) )
+    {
+        alarmsBlockedTimer = ALARM_BLOCKED_COUNT_AFTER_AC_RETURN;
+    }
     // Verify valid alarm index
     if ( ( alarm > ALARM_ID_NO_ALARM ) && ( alarm < NUM_OF_ALARM_IDS ) )
     {