Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r8128289dea98878d92bf170fde1c7145f858baa5 -rc7ffa13e306681a647ad25513a89250c6918e6a4
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 8128289dea98878d92bf170fde1c7145f858baa5)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision c7ffa13e306681a647ad25513a89250c6918e6a4)
@@ -33,7 +33,7 @@
 #define BLOOD_PUMP_FLOW_RATE_PURGE_AIR          100                                                 ///< Blood pump flow rate during prime purge air state.
 #define BLOOD_PUMP_FLOW_RATE_CIRC_BLOOD_CIRCUIT 300                                                 ///< Blood pump flow rate during prime recirculate blood circuit state.
 #define NO_AIR_DETECTED_COUNT                   ( 10 * MS_PER_SECOND / TASK_GENERAL_INTERVAL )      ///< No air detected time period count.
-#define PURGE_AIR_TIME_OUT_COUNT                ( 15 * MS_PER_SECOND / TASK_GENERAL_INTERVAL )      ///< Time period count for purge air time out.
+#define PURGE_AIR_TIME_OUT_COUNT                ( 30 * MS_PER_SECOND / TASK_GENERAL_INTERVAL )      ///< Time period count for purge air time out.
 
 #define PRIME_DRAIN_RESERVOIR_TO_VOLUME_ML      100                                                 ///< Drain reservoir to this volume (in mL) during prime.
 #define PRIME_FILL_RESERVOIR_TO_VOLUME_ML       1700                                                ///< Fill reservoir to this volume (in mL) during prime.