Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r8a8864ea7ccd35af809697129710ea8ebc96d83b -r7512cd8e1330eee051b4ac99aded3aa2a6a522fd
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 8a8864ea7ccd35af809697129710ea8ebc96d83b)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 7512cd8e1330eee051b4ac99aded3aa2a6a522fd)
@@ -738,8 +738,8 @@
                 stabilizationStartTimeMs = getMSTimerCount();
                 pressureStabilizeTime = STABILIZATION_PERIOD_OFF;
                 currPresLimitsState = PRESSURE_LIMITS_STATE_STABILIZATION_2;
-                // Open air trap valve to clear any accumulated bubbles
-                signalAirTrapValveOpen();
+                // Fill air trap to clear any accumulated bubbles
+                signalAirTrapPeriodicFill();
             }
             break;