diff --git a/homeassistant/components/openevse/__init__.py b/homeassistant/components/openevse/__init__.py
index daf12c5bc8dd..6e79c6195d60 100644
--- a/homeassistant/components/openevse/__init__.py
+++ b/homeassistant/components/openevse/__init__.py
@@ -1,7 +1,7 @@
 """The OpenEVSE integration."""
 
 from openevsehttp.__main__ import OpenEVSE
-from openevsehttp.exceptions import AuthenticationError
+from openevsehttp.exceptions import AuthenticationError, MissingSerial
 
 from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_USERNAME, Platform
 from homeassistant.core import HomeAssistant
@@ -42,6 +42,8 @@ async def async_setup_entry(hass: HomeAssistant, entry: OpenEVSEConfigEntry) ->
             translation_domain=DOMAIN,
             translation_key="authentication_error",
         ) from ex
+    except MissingSerial:
+        pass
 
     coordinator = OpenEVSEDataUpdateCoordinator(hass, entry, charger)
     await coordinator.async_config_entry_first_refresh()
diff --git a/tests/components/openevse/test_init.py b/tests/components/openevse/test_init.py
index a0326dbf598f..24b33aec2319 100644
--- a/tests/components/openevse/test_init.py
+++ b/tests/components/openevse/test_init.py
@@ -2,7 +2,7 @@
 
 from unittest.mock import MagicMock
 
-from openevsehttp.exceptions import AuthenticationError
+from openevsehttp.exceptions import AuthenticationError, MissingSerial
 
 from homeassistant.config_entries import SOURCE_REAUTH, ConfigEntryState
 from homeassistant.core import HomeAssistant
@@ -84,3 +84,18 @@ async def test_unload_entry(
     await hass.async_block_till_done()
 
     assert mock_config_entry.state is ConfigEntryState.NOT_LOADED
+
+
+async def test_setup_entry_missing_serial(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_charger: MagicMock,
+) -> None:
+    """Test setup entry succeeds when serial number is missing."""
+    mock_charger.test_and_get.side_effect = MissingSerial
+
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.LOADED