Index: leahi_dialin/dd/modules/valves.py
===================================================================
diff -u -r396e5d3fdfdcdabca9cc7434de0fcee52036aaa1 -rd829f0144de9fa02376bf7fac05a1f0758f28f7a
--- leahi_dialin/dd/modules/valves.py	(.../valves.py)	(revision 396e5d3fdfdcdabca9cc7434de0fcee52036aaa1)
+++ leahi_dialin/dd/modules/valves.py	(.../valves.py)	(revision d829f0144de9fa02376bf7fac05a1f0758f28f7a)
@@ -83,10 +83,10 @@
         self.d23_valv = {"id": dd_enum_repository.DDValveNames.D23_VALV.value, "state": DEENERGIZED}
         self.d19_valv = {"id": dd_enum_repository.DDValveNames.D19_VALV.value, "state": DEENERGIZED}
         self.d25_valv = {"id": dd_enum_repository.DDValveNames.D25_VALV.value, "state": DEENERGIZED}
-        self.d21_valv = {"id": dd_enum_repository.DDValveNames.D26_VALV.value, "state": DEENERGIZED}
+        self.d21_valv = {"id": dd_enum_repository.DDValveNames.D21_VALV.value, "state": DEENERGIZED}
         self.d24_valv = {"id": dd_enum_repository.DDValveNames.D24_VALV.value, "state": DEENERGIZED}
         self.d20_valv = {"id": dd_enum_repository.DDValveNames.D20_VALV.value, "state": DEENERGIZED}
-        self.d26_valv = {"id": dd_enum_repository.DDValveNames.D21_VALV.value, "state": DEENERGIZED}
+        self.d26_valv = {"id": dd_enum_repository.DDValveNames.D26_VALV.value, "state": DEENERGIZED}
         self.d22_valv = {"id": dd_enum_repository.DDValveNames.D22_VALV.value, "state": DEENERGIZED}
 
         self.d79_pmp_valv = {"id": dd_enum_repository.DDValveNames.D79_PMP_VALV.value, "state": DEENERGIZED}
@@ -357,7 +357,7 @@
             can_interface = self.can_interface)
 
 
-    def cmd_bc_valves_override(self, bcv1: bool, bcv2: bool, bcv3: bool, bcv4: bool, bcv5: bool, bcv6: bool, bcv7: bool, bcv8: bool) -> int:
+    def cmd_bc_valves_override(self, bcv1: bool, bcv2: bool, bcv3: bool, bcv4: bool, bcv5: bool, bcv6: bool, bcv7: bool, bcv8: bool, reset: int = NO_RESET) -> int:
         """
         Constructs and sends the balancing chamber valve states override command.
         Constraints:
@@ -372,8 +372,10 @@
         @param bcv6:  bool - valve state for D20_VALV (true=open, false=closed)
         @param bcv7:  bool - valve state for D26_VALV (true=open, false=closed)
         @param bcv8:  bool - valve state for D22_VALV (true=open, false=closed)
+        @param reset:  integer - 1 to reset a previous override, 0 to override
         @return: 1 if successful, zero otherwise
         """
+        rst = integer_to_bytearray(reset)
         valve = 0
         if bcv1:
             valve = valve | 0x1
@@ -392,11 +394,12 @@
         if bcv8:
             valve = valve | 0x80
 
-        payload = integer_to_bytearray(valve)
+        vlv = integer_to_bytearray(valve)
+        payload = rst + vlv
 
         return cmd_generic_override(
             payload = payload,
-            reset = NO_RESET,
+            reset = reset,
             channel_id = DenaliChannels.dialin_to_dd_ch_id,
             msg_id = MsgIds.MSG_ID_DD_BC_VALVE_STATES_OVERRIDE_REQUEST,
             entity_name = f'DD Balancing Chamber Valves state',