Index: firmware/App/Modes/ModeHeatDisinfect.c
===================================================================
diff -u -r26f63d0260a3c35277e3e6dbca3573c253775318 -r1b95ae077de1d01a314be8cc011662ab508fba10
--- firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 26f63d0260a3c35277e3e6dbca3573c253775318)
+++ firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 1b95ae077de1d01a314be8cc011662ab508fba10)
@@ -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;