Index: firmware/App/Modes/ModeHeatDisinfect.c
===================================================================
diff -u -r94a190522ce398399c7b93c59f788d7666ec0060 -r2b60564ac818a6692b714dfd9920d2e2fcf0937d
--- firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 94a190522ce398399c7b93c59f788d7666ec0060)
+++ firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 2b60564ac818a6692b714dfd9920d2e2fcf0937d)
@@ -508,6 +508,9 @@
         }
         else
         {
+            tareLoadCell( LOAD_CELL_RESERVOIR_1_PRIMARY );
+            tareLoadCell( LOAD_CELL_RESERVOIR_1_BACKUP );
+
             // Assume reservoir 2 is full and drain it
             rsrvr2Status = DG_RESERVOIR_ABOVE_TARGET;