Index: firmware/App/Modes/SelfTests.c
===================================================================
diff -u -r3b7059f9225a021c5c55a3cb7874bafc2ae1eb48 -r81e9ee9140164f6097e84a68f8b2b0c1cd82ba91
--- firmware/App/Modes/SelfTests.c	(.../SelfTests.c)	(revision 3b7059f9225a021c5c55a3cb7874bafc2ae1eb48)
+++ firmware/App/Modes/SelfTests.c	(.../SelfTests.c)	(revision 81e9ee9140164f6097e84a68f8b2b0c1cd82ba91)
@@ -543,7 +543,7 @@
         selfTestPreviousPublishDataTime = getMSTimerCount();
 
         data.timeout   = MAX_DRY_SELF_TEST_TIME;
-        data.countdown = ( MAX_DRY_SELF_TEST_TIME - elapsedSelfTestTimeInSecs );
+        data.countdown = ( elapsedSelfTestTimeInSecs <= MAX_DRY_SELF_TEST_TIME ? ( MAX_DRY_SELF_TEST_TIME - elapsedSelfTestTimeInSecs ) : 0 );
         broadcastData( MSG_ID_HD_DRY_SELF_TEST_PROGRESS_DATA, COMM_BUFFER_OUT_CAN_HD_BROADCAST, (U08*)&data, sizeof( SELF_TEST_DRY_PAYLOAD_T ) );
     }
 }