diff --git a/pus_tc/devs/heater.py b/pus_tc/devs/heater.py
index d8d6e05..be02e44 100644
--- a/pus_tc/devs/heater.py
+++ b/pus_tc/devs/heater.py
@@ -26,7 +26,9 @@ class SwitchNumbers:
 
 
 class OpCodes:
-    HEATER_CMD = ["0", "heater-cmd"]
+    HEATER_CMD = ["0", "switch-cmd"]
+    HEATER_EXT_CTRL = ["1", "heater-ext-ctrl"]
+    HEATER_FAULTY_CMD = ["2", "set-faulty"]
 
 
 class Info:
@@ -50,45 +52,48 @@ def add_heater_cmds(cmd_dict: ServiceOpCodeDictT):
     )
 
 
-def pack_heater_cmds(object_id: bytearray, tc_queue: TcQueueT):
-    tc_queue.appendleft((QueueCommands.PRINT, "Heater Switching"))
-    while True:
-        heater_number = input("Type number of heater to switch [0-7]: ")
-        if not heater_number.isdigit():
-            print("Heater number not a digit")
-            continue
-        heater_number = int(heater_number)
-        if heater_number >= SwitchNumbers.NUMBER_OF_SWITCHES or heater_number < 0:
-            print("Invalid heater switch number")
-            continue
-        break
-    while True:
-        action = input("Turn switch on or off? (0 - off, 1 - on): ")
-        if not action.isdigit():
-            print("Switch action not valid")
-            continue
-        action = int(action)
-        if action != 0 and action != 1:
-            print("Invalid action defined. Must be 0 (off) or 1 (on")
-            continue
-        break
-    if action == 1:
-        act_str = "on"
-    else:
-        act_str = "off"
-    debug_string = f"Switching heater {heater_number} {act_str}"
-    tc_queue.appendleft((QueueCommands.PRINT, debug_string))
-    command = pack_switch_heater_command(object_id, heater_number, action)
-    tc_queue.appendleft(command.pack_command_tuple())
+def pack_heater_cmds(object_id: bytearray, op_code: str, tc_queue: TcQueueT):
+    if op_code in OpCodes.HEATER_CMD:
+        tc_queue.appendleft((QueueCommands.PRINT, "Heater Switching"))
+        while True:
+            heater_number = input("Type number of heater to switch [0-7]: ")
+            if not heater_number.isdigit():
+                print("Heater number not a digit")
+                continue
+            heater_number = int(heater_number)
+            if heater_number >= SwitchNumbers.NUMBER_OF_SWITCHES or heater_number < 0:
+                print("Invalid heater switch number")
+                continue
+            break
+        while True:
+            action = input("Turn switch on or off? (0 - off, 1 - on): ")
+            if not action.isdigit():
+                print("Switch action not valid")
+                continue
+            action = int(action)
+            if action != 0 and action != 1:
+                print("Invalid action defined. Must be 0 (off) or 1 (on")
+                continue
+            break
+        if action == 1:
+            act_str = "on"
+        else:
+            act_str = "off"
+        debug_string = f"Switching heater {heater_number} {act_str}"
+        tc_queue.appendleft((QueueCommands.PRINT, debug_string))
+        command = pack_switch_heater_command(object_id, heater_number, action)
+        tc_queue.appendleft(command.pack_command_tuple())
+    if op_code in OpCodes.HEATER_EXT_CTRL:
+        pass
 
 
 def pack_switch_heater_command(
     object_id: bytes, switch_nr: int, switch_action: int
 ) -> PusTelecommand:
-    """Function to generate the command switch a heater
-    @param object_id    The object id of the HeaterHandler object.
-    @param switch_nr    The switch number identifying the heater to switch
-    @param switch_action    Action to perform. 0 - Sets switch off, 1 - Sets switch on.
+    """Function to generate a heater switch command.
+    :param object_id: The object id of the HeaterHandler object.
+    :param switch_nr: The switch number identifying the heater to switch
+    :param switch_action: Action to perform. 0 - Sets switch off, 1 - Sets switch on.
     """
     command = bytearray()
     command.append(switch_nr)