diff --git a/homeassistant/components/prusalink/config_flow.py b/homeassistant/components/prusalink/config_flow.py
index da21cca99de..6b0e6189f41 100644
--- a/homeassistant/components/prusalink/config_flow.py
+++ b/homeassistant/components/prusalink/config_flow.py
@@ -22,18 +22,9 @@ from .const import DOMAIN
 _LOGGER = logging.getLogger(__name__)
 
 
-def add_protocol(value: str) -> str:
-    """Validate URL has a scheme."""
-    value = value.rstrip("/")
-    if value.startswith(("http://", "https://")):
-        return value
-
-    return f"http://{value}"
-
-
 STEP_USER_DATA_SCHEMA = vol.Schema(
     {
-        vol.Required("host"): vol.All(str, add_protocol),
+        vol.Required("host"): str,
         vol.Required("api_key"): str,
     }
 )
@@ -77,10 +68,18 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                 step_id="user", data_schema=STEP_USER_DATA_SCHEMA
             )
 
+        host = user_input["host"].rstrip("/")
+        if not host.startswith(("http://", "https://")):
+            host = f"http://{host}"
+
+        data = {
+            "host": host,
+            "api_key": user_input["api_key"],
+        }
         errors = {}
 
         try:
-            info = await validate_input(self.hass, user_input)
+            info = await validate_input(self.hass, data)
         except CannotConnect:
             errors["base"] = "cannot_connect"
         except NotSupported:
@@ -91,7 +90,7 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
             _LOGGER.exception("Unexpected exception")
             errors["base"] = "unknown"
         else:
-            return self.async_create_entry(title=info["title"], data=user_input)
+            return self.async_create_entry(title=info["title"], data=data)
 
         return self.async_show_form(
             step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors
diff --git a/tests/components/prusalink/test_camera.py b/tests/components/prusalink/test_camera.py
index 36ec8ec3700..74354a75580 100644
--- a/tests/components/prusalink/test_camera.py
+++ b/tests/components/prusalink/test_camera.py
@@ -20,6 +20,7 @@ async def test_camera_no_job(
     hass: HomeAssistant,
     mock_config_entry,
     mock_api,
+    hass_client,
 ) -> None:
     """Test sensors while no job active."""
     assert await async_setup_component(hass, "prusalink", {})
@@ -27,6 +28,10 @@ async def test_camera_no_job(
     assert state is not None
     assert state.state == "unavailable"
 
+    client = await hass_client()
+    resp = await client.get("/api/camera_proxy/camera.mock_title_job_preview")
+    assert resp.status == 500
+
 
 async def test_camera_active_job(
     hass: HomeAssistant, mock_config_entry, mock_api, mock_job_api_active, hass_client
diff --git a/tests/components/prusalink/test_config_flow.py b/tests/components/prusalink/test_config_flow.py
index 78cd652f5eb..4810ea82166 100644
--- a/tests/components/prusalink/test_config_flow.py
+++ b/tests/components/prusalink/test_config_flow.py
@@ -83,8 +83,8 @@ async def test_form_unknown(hass: HomeAssistant) -> None:
     assert result2["errors"] == {"base": "unknown"}
 
 
-async def test_form_invalid_version(hass: HomeAssistant, mock_version_api) -> None:
-    """Test we handle invalid auth."""
+async def test_form_too_low_version(hass: HomeAssistant, mock_version_api) -> None:
+    """Test we handle too low API version."""
     result = await hass.config_entries.flow.async_init(
         DOMAIN, context={"source": config_entries.SOURCE_USER}
     )
@@ -103,6 +103,26 @@ async def test_form_invalid_version(hass: HomeAssistant, mock_version_api) -> No
     assert result2["errors"] == {"base": "not_supported"}
 
 
+async def test_form_invalid_version_2(hass: HomeAssistant, mock_version_api) -> None:
+    """Test we handle invalid version."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    mock_version_api["api"] = "i am not a version"
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {
+            "host": "1.1.1.1",
+            "api_key": "abcdefg",
+        },
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"base": "not_supported"}
+
+
 async def test_form_cannot_connect(hass: HomeAssistant) -> None:
     """Test we handle cannot connect error."""
     result = await hass.config_entries.flow.async_init(
diff --git a/tests/components/prusalink/test_init.py b/tests/components/prusalink/test_init.py
index a36c70bb882..2e15ac19193 100644
--- a/tests/components/prusalink/test_init.py
+++ b/tests/components/prusalink/test_init.py
@@ -1,16 +1,23 @@
 """Test setting up and unloading PrusaLink."""
+from datetime import timedelta
+from unittest.mock import patch
 
+from pyprusalink import InvalidAuth, PrusaLinkError
+import pytest
 
 from homeassistant.config_entries import ConfigEntry, ConfigEntryState
 from homeassistant.core import HomeAssistant
+from homeassistant.util.dt import utcnow
+
+from tests.common import async_fire_time_changed
 
 
-async def test_sensors_no_job(
+async def test_unloading(
     hass: HomeAssistant,
     mock_config_entry: ConfigEntry,
     mock_api,
 ):
-    """Test sensors while no job active."""
+    """Test unloading prusalink."""
     assert await hass.config_entries.async_setup(mock_config_entry.entry_id)
     assert mock_config_entry.state == ConfigEntryState.LOADED
 
@@ -21,3 +28,25 @@ async def test_sensors_no_job(
 
     for state in hass.states.async_all():
         assert state.state == "unavailable"
+
+
+@pytest.mark.parametrize("exception", [InvalidAuth, PrusaLinkError])
+async def test_failed_update(
+    hass: HomeAssistant, mock_config_entry: ConfigEntry, mock_api, exception
+):
+    """Test failed update marks prusalink unavailable."""
+    assert await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    assert mock_config_entry.state == ConfigEntryState.LOADED
+
+    with patch(
+        "homeassistant.components.prusalink.PrusaLink.get_printer",
+        side_effect=exception,
+    ), patch(
+        "homeassistant.components.prusalink.PrusaLink.get_job",
+        side_effect=exception,
+    ):
+        async_fire_time_changed(hass, utcnow() + timedelta(seconds=30), fire_all=True)
+        await hass.async_block_till_done()
+
+    for state in hass.states.async_all():
+        assert state.state == "unavailable"