diff --git a/src/Mod/FreeCADExchange/AutoRouting.py b/src/Mod/FreeCADExchange/AutoRouting.py
index 5ec44c7..bba9eb4 100644
--- a/src/Mod/FreeCADExchange/AutoRouting.py
+++ b/src/Mod/FreeCADExchange/AutoRouting.py
@@ -1028,9 +1028,6 @@ def route_eplan_connection_between_terminals(
     if not project_uuid:
         raise AutoRoutingError("Project UUID is required for routing connections.")
 
-    if opts.get("replace_existing", True):
-        _remove_existing_routing_connections(doc, start_uuid, end_uuid, wire_uuid=wire_uuid)
-
     route_data = build_network_route(
         start_terminal,
         end_terminal,
@@ -1054,6 +1051,9 @@ def route_eplan_connection_between_terminals(
     collisions = detect_collisions(points, obstacles, ignored_segment_indices=ignored_collision_segments)
     status = "CollisionWarning" if collisions else "Routed"
 
+    if opts.get("replace_existing", True):
+        _remove_existing_routing_connections(doc, start_uuid, end_uuid, wire_uuid=wire_uuid)
+
     wire_name = _unique_name(doc, _wire_object_name(start_terminal, end_terminal, wire_uuid))
     wire = _create_wire_geometry(doc, wire_name, points)
     wire.Label = wire_label or wire_mark or wire_uuid or "QET Routed Connection"
diff --git a/tests/python/freecad_exchange_auto_routing_test.py b/tests/python/freecad_exchange_auto_routing_test.py
index 5a43b75..cb39904 100644
--- a/tests/python/freecad_exchange_auto_routing_test.py
+++ b/tests/python/freecad_exchange_auto_routing_test.py
@@ -362,6 +362,40 @@ class AutoRoutingTest(unittest.TestCase):
         self.assertEqual("terminal-start-new", routed_wires[0].QetStartTerminalUuid)
         self.assertEqual("terminal-end-new", routed_wires[0].QetEndTerminalUuid)
 
+    def test_eplan_connection_route_keeps_existing_wire_when_replacement_fails(self):
+        _install_fake_freecad()
+        terminal_objects, wiring_objects, routing_network, auto_routing = _reload_modules()
+        app = sys.modules["FreeCAD"]
+        doc = FakeDocument()
+        terminal_objects.ensure_root_group(doc, "project-1")
+        start = _terminal(doc, terminal_objects, "TerminalStart", "terminal-start", app.Vector(0, 0, 0))
+        end = _terminal(doc, terminal_objects, "TerminalEnd", "terminal-end", app.Vector(100, 0, 0))
+        routing_network.create_route_carrier(
+            doc,
+            [app.Vector(0, 0, 20), app.Vector(100, 0, 20)],
+            project_uuid="project-1",
+            kind="WireDuct",
+        )
+        first = auto_routing.route_eplan_connection_between_terminals(
+            doc,
+            start,
+            end,
+            wire_uuid="wire-1",
+        )["wire"]
+        routing_network.clear_route_carriers(doc)
+
+        with self.assertRaises(auto_routing.AutoRoutingError):
+            auto_routing.route_eplan_connection_between_terminals(
+                doc,
+                start,
+                end,
+                wire_uuid="wire-1",
+            )
+        routed_wires = list(wiring_objects.iter_routed_wire_objects(doc))
+
+        self.assertEqual([first], routed_wires)
+        self.assertIsNotNone(doc.getObject(first.Name))
+
     def test_route_carrier_styles_make_generated_objects_distinguishable(self):
         _install_fake_freecad()
         terminal_objects, _wiring_objects, routing_network, _auto_routing = _reload_modules()