Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rbbf4e1a170f66ce07af12908a1d0fe101a934e9e -rc0445144841904d5a6ea9d37af639e138e6a86b0
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision bbf4e1a170f66ce07af12908a1d0fe101a934e9e)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision c0445144841904d5a6ea9d37af639e138e6a86b0)
@@ -587,6 +587,35 @@
 {
     signalUserConfirmInstallation();
 }
+
+/*********************************************************************//**
+ * @brief
+ * The handlePrimingStartCmd function handles user confirms disposable
+ * installation msg from the UI.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none.
+ *************************************************************************/
+void handleStartPrimeCmd( MESSAGE_T *message )
+{
+    signalStartPrime();
+}
+
+/*********************************************************************//**
+ * @brief
+ * The sendStartPrimeCmdResponse function constructs a start prime user action
+ * response to the UI and queues the msg for transmit on the appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: Start prime command response msg constructed and queued.
+ * @param accepted T/F - was sample water request accepted?
+ * @param reason reason why request was rejected (or zero if accepted)
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendStartPrimeCmdResponse( BOOL accepted, U32 reason )
+{
+    return sendUIResponseMsg( MSG_ID_HD_START_PRIME_REQUEST_RESPONSE, accepted, reason );
+}
 
 /*********************************************************************//**
  * @brief