Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r41c5e70eccfc2c11a0352fe94e107fc44d83ca5b -r493b74788dde91fc09303df6185bd9fa90de52d0
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 41c5e70eccfc2c11a0352fe94e107fc44d83ca5b)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 493b74788dde91fc09303df6185bd9fa90de52d0)
@@ -676,8 +676,8 @@
                 stabilizationStartTimeMs = getMSTimerCount();
                 useShortStabilizeTime = USE_NORMAL_STABILIZATION_PERIOD;
                 currPresLimitsState = PRESSURE_LIMITS_STATE_STABILIZATION;
-                // Open air trap valve to clear any accumulated bubbles
-                signalAirTrapValveOpen();
+                // Fill air trap to clear any accumulated bubbles
+                signalAirTrapPeriodicFill();
             }
             break;