Index: firmware/App/DDCommon.h
===================================================================
diff -u -r21970bc9eb9d4411d3061c3a2c8fad629bf5465e -ra2ea8edd918761b403cbe2c00e1bfe2fc69be5ea
--- firmware/App/DDCommon.h	(.../DDCommon.h)	(revision 21970bc9eb9d4411d3061c3a2c8fad629bf5465e)
+++ firmware/App/DDCommon.h	(.../DDCommon.h)	(revision a2ea8edd918761b403cbe2c00e1bfe2fc69be5ea)
@@ -57,16 +57,22 @@
 //Uncomment below if D1 placement is used for Temp control at dialyzer
 //#define __USE_D1_TEMP_     1
 
+//Uncomment below to disable revised heater model
+#define __REVISED_HEATER_MODEL__   1
+
 // comment below to disable bicarb multi level sensor for time based chamber F fill
 #define CONDUCTIVE_LEVEL_SENSOR_ENABLED  1
 
 //Uncomment below to enable d30 heater alarm(as all units are not equipped with d30 temp sensor)
 //#define ENABLE_ALARM_3
 
-//Define to enable the DD too-many-bad-message-CRCs alarm.
-//#define __BAD_MSG_CRC_ALARM_ENABLED__    1
+//Comment below to disable the DD too-many-bad-message-CRCs alarm.
+#define __BAD_MSG_CRC_ALARM_ENABLED__    1
 
+//Comment below to disable the conductivity sensor alarms
+#define ENABLE_ALARM_4
 
+
     #include <stdio.h>
     #include <strings.h>
 #endif