Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -rd75fca5ec82e1dfe92df0c712b21dc3a98829d0e -rfe3a4b13527ae0cdd2377d9c8971bc541979e2d5
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision d75fca5ec82e1dfe92df0c712b21dc3a98829d0e)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision fe3a4b13527ae0cdd2377d9c8971bc541979e2d5)
@@ -1159,6 +1159,7 @@
         getNVRecord2Driver( GET_USAGE_RECORD, (U08*)&usageRecord, sizeof( HD_USAGE_INFO_RECORD_T ), 0, ALARM_ID_NO_ALARM );
 
         U32 lastChemCompleteDateS      = data.dgUsageInfo.lastChemDisCompleteDateEpoch;
+        U32 lastChemStartDateS         = data.dgUsageInfo.lastChemDisStartDateEpoch;
         U32 lastChemFlushCompleteDateS = data.dgUsageInfo.lastChemDisFlushCompleteDateEpoch;
         U32 lastHeatCompleteDateS      = data.dgUsageInfo.lastHeatDisCompleteDateEpoch;
         U32 lastFlushCompleteDateS     = data.dgUsageInfo.lastBasicFlushCompleteDateEpoch;
@@ -1174,7 +1175,7 @@
         BOOL isHeatDisValid = ( ( currentRTCEpochTimeS - lastHeatCompleteDateS ) < DISINFECTS_TIME_INTERVAL_S ? TRUE : FALSE );
 
         // Last Chem Flush Complete < Last Chem Disinfect Start, so after running a chemical disinfect, a chemical disinfect flush has been done
-        BOOL isChemFlushComplete = ( lastChemFlushCompleteDateS > lastChemCompleteDateS ? TRUE : FALSE );
+        BOOL isChemFlushComplete = ( lastChemFlushCompleteDateS > lastChemStartDateS ? TRUE : FALSE );
 
         // If either of the basic flush, heat disinfect, or chemical disinfect flush have been done within the interval, it means the filters have been flushed
         BOOL isBasicFlushValid       = ( ( currentRTCEpochTimeS - lastFlushCompleteDateS     ) < FLUSH_TIME_INTERVAL_S ? TRUE : FALSE );