Index: firmware/App/Modes/ModeHeatDisinfect.c
===================================================================
diff -u -r60ec2f1256b02ee0a6d4346877494ce1bda55ab2 -rf215311725c002c9b9f2915e3502b89ae6a93c91
--- firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 60ec2f1256b02ee0a6d4346877494ce1bda55ab2)
+++ firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision f215311725c002c9b9f2915e3502b89ae6a93c91)
@@ -505,6 +505,9 @@
         }
         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;