Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r173e4fbf9bd750bccb2e758eb1c7ef36ed8db5a0 -rf9570a9717805d0759622da836a33ee04f3fa40f
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 173e4fbf9bd750bccb2e758eb1c7ef36ed8db5a0)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision f9570a9717805d0759622da836a33ee04f3fa40f)
@@ -7,8 +7,8 @@
 *
 * @file    Prime.c
 *
-* @author  (last)      Bill Bracken
-* @date    (last)      24-Aug-2022
+* @author  (last)      Michael Garthwaite
+* @date    (last)      26-Aug-2022
 *
 * @author  (original)  Quang Nguyen
 * @date    (original)  08-Dec-2020
@@ -52,7 +52,7 @@
 #define DIALYZER_VOLUME_SCALE_FACTOR                        0.5F                                               ///< Half of the dialyzer total volume.
 
 #define NO_AIR_DETECTED_COUNT                               ( 20 * MS_PER_SECOND )                             ///< No air detected time period count.
-#define PURGE_AIR_TIME_OUT_COUNT                            ( 60 * MS_PER_SECOND )                             ///< Time period count for purge air time out.
+#define PURGE_AIR_TIME_OUT_COUNT                            ( 120 * MS_PER_SECOND )                            ///< Time period count for purge air time out.
 #define LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME               (  1 * MS_PER_SECOND )                             ///< Time load cell reading steady state detection sampling time in seconds.
 #define PRIME_DIALYSATE_BYPASS_TIME_LIMIT                   ( 15 * MS_PER_SECOND )                             ///< Time limit for priming dialysate bypass circuit.
 #define STEADY_VOLUME_COUNT_SEC                             ( 10000 / LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME )  ///< Counter must be greater than 10 seconds before steady volume is true.