diff --git a/homeassistant/components/min_max/repairs.py b/homeassistant/components/min_max/repairs.py
index cbb20b806112..51c5e54123d4 100644
--- a/homeassistant/components/min_max/repairs.py
+++ b/homeassistant/components/min_max/repairs.py
@@ -1,5 +1,6 @@
 """Repairs platform for the Min/Max integration."""
 
+import asyncio
 from typing import TYPE_CHECKING, Any
 
 import probatio
@@ -11,7 +12,7 @@ from homeassistant.components.repairs import (
     RepairsFlowResult,
 )
 from homeassistant.components.sensor import DOMAIN as SENSOR_DOMAIN
-from homeassistant.config_entries import SOURCE_IMPORT
+from homeassistant.config_entries import SOURCE_IMPORT, ConfigEntryState
 from homeassistant.const import CONF_ENTITIES
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
@@ -71,6 +72,23 @@ class MigrateToGroupSensorFlow(RepairsFlow):
                         "error": import_result["description_placeholders"]["error"]
                     },
                 )
+            new_config_entry_id = import_result["result"].entry_id
+            # Wait for the new config entry to be fully set up
+            for i in range(10):
+                new_entry = self.hass.config_entries.async_get_entry(
+                    new_config_entry_id
+                )
+                if TYPE_CHECKING:
+                    assert new_entry
+                if new_entry.state is ConfigEntryState.LOADED:
+                    break
+                if i == 9:
+                    await self.hass.config_entries.async_remove(new_config_entry_id)
+                    return self.async_abort(
+                        reason="could_not_start_group_entity",
+                    )
+                await asyncio.sleep(1)
+
             return self.async_create_entry(data={})
 
         entity_info = entity_reg.async_get(old_entity)
diff --git a/homeassistant/components/min_max/strings.json b/homeassistant/components/min_max/strings.json
index 2cbfd927fc1d..9bd14247d84b 100644
--- a/homeassistant/components/min_max/strings.json
+++ b/homeassistant/components/min_max/strings.json
@@ -15,6 +15,7 @@
       "fix_flow": {
         "abort": {
           "could_not_import": "Failed to import the config entry for the Group helper\n**Error:** {error}\n\nPlease manually remove the Min/Max helper and create your new Group helper.",
+          "could_not_start_group_entity": "The new Group entity has errored and can not start. Remove the Min/Max helper to clear this repair, then create a Group sensor if needed.",
           "entity_not_found": "The Min/Max entity no longer exists. Remove the remaining Min/Max helper to clear this repair, then create a Group sensor if needed."
         },
         "step": {
diff --git a/tests/components/min_max/test_init.py b/tests/components/min_max/test_init.py
index 67494b19da37..0ee73ba8250a 100644
--- a/tests/components/min_max/test_init.py
+++ b/tests/components/min_max/test_init.py
@@ -1,5 +1,7 @@
 """Test the Min/Max integration."""
 
+from unittest.mock import patch
+
 from freezegun.api import FrozenDateTimeFactory
 from syrupy.assertion import SnapshotAssertion
 from syrupy.filters import props
@@ -289,3 +291,82 @@ async def test_issue_is_deleted_on_removal(
         DOMAIN, f"migrate_to_group_sensor-{config_entry.entry_id}"
     )
     assert issue is None
+
+
+async def test_issue_is_aborted_on_could_not_start_group(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    issue_registry: ir.IssueRegistry,
+    freezer: FrozenDateTimeFactory,
+    snapshot: SnapshotAssertion,
+    hass_client: ClientSessionGenerator,
+    hass_ws_client: WebSocketGenerator,
+) -> None:
+    """Test migrating to group sensors fails when group setup fails."""
+    assert await async_setup_component(hass, "repairs", {})
+    hass.states.async_set("sensor.input_one", "10")
+    hass.states.async_set("sensor.input_two", "20")
+
+    input_sensors = ["sensor.input_one", "sensor.input_two"]
+
+    min_max_entity_id = "sensor.my_min_max"
+
+    config_entry = MockConfigEntry(
+        data={},
+        domain=DOMAIN,
+        entry_id="123",
+        options={
+            "entity_ids": input_sensors,
+            "name": "My min_max",
+            "round_digits": 2.0,
+            "type": "max",
+        },
+        title="My min_max",
+    )
+    config_entry.add_to_hass(hass)
+    assert await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    entity = entity_registry.async_get(min_max_entity_id)
+    assert entity is not None
+
+    issue = issue_registry.async_get_issue(
+        DOMAIN, f"migrate_to_group_sensor-{config_entry.entry_id}"
+    )
+    assert issue is not None
+    assert issue.is_fixable is True
+    assert issue.breaks_in_ha_version == "2026.12.0"
+
+    ws_client = await hass_ws_client(hass)
+    client = await hass_client()
+    await ws_client.send_json({"id": 1, "type": "repairs/list_issues"})
+    msg = await ws_client.receive_json()
+
+    assert msg["success"]
+
+    data = await start_repair_fix_flow(
+        client, DOMAIN, f"migrate_to_group_sensor-{config_entry.entry_id}"
+    )
+    flow_id = data["flow_id"]
+    assert data["description_placeholders"] == {"title": "My min_max"}
+    assert data["step_id"] == "migrate"
+
+    with (
+        patch(
+            "homeassistant.components.group.async_setup_entry", return_value=False
+        ) as mock_setup_entry,
+        patch("homeassistant.components.min_max.repairs.asyncio.sleep"),
+    ):
+        data = await process_repair_fix_flow(client, flow_id, json={})
+        await hass.async_block_till_done()
+
+    assert mock_setup_entry.called
+    assert data["type"] == FlowResultType.ABORT
+
+    entity = entity_registry.async_get(min_max_entity_id)
+    assert entity.config_entry_id is not None
+    assert entity.config_entry_id == config_entry.entry_id
+    assert entity.unique_id == config_entry.entry_id
+    assert entity.platform == DOMAIN
+
+    assert not hass.config_entries.async_has_entries(GROUP_DOMAIN)