Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r520b5b97e2a1a6d7af037e1144f1ffeb39153e3e -r7d7129ebe8a98694bea7cf4118f3bedf62f2157b
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 520b5b97e2a1a6d7af037e1144f1ffeb39153e3e)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 7d7129ebe8a98694bea7cf4118f3bedf62f2157b)
@@ -723,12 +723,12 @@
             if ( D5_HEAT == heater )
             {
                 alarm       = ALARM_ID_DD_FLUID_TOO_LOW_WHILE_D5_HEAT_IS_ON;
-                isLevelLow  = ( ( getLevelStatus( D6_LEVL ) != 0 )? FALSE : TRUE );
+                isLevelLow  = ( ( getFloaterStatus( D6_LEVL ) != LVL_STATE_EMPTY ) ? FALSE : TRUE );
             }
             else
             {
                 alarm       = ALARM_ID_DD_FLUID_TOO_LOW_WHILE_D45_HEAT_IS_ON;
-                isLevelLow  = ( ( getLevelStatus( D46_LEVL ) != 0 )? FALSE : TRUE );
+                isLevelLow  = ( ( getLevelStatus( D46_LEVL ) != LEVEL_STATE_LOW ) ? FALSE : TRUE );
             }
 
             checkPersistentAlarm( alarm, isLevelLow, 0.0F, 0.0F );