From 6cd599b7dfc8382b13325b350d17ecac4475bedb Mon Sep 17 00:00:00 2001
From: dangyuluo <github@meizun.org>
Date: Sat, 7 Apr 2018 15:47:56 -0400
Subject: [PATCH] Throw an error when invalid device_mode is given (#13739)

* Throw an error when invalid device_mode is given

* Fix lint issue, typo and error msg

* Fix error msg
---
 homeassistant/components/climate/nest.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/homeassistant/components/climate/nest.py b/homeassistant/components/climate/nest.py
index d11f6890a7b..0a5344fdf98 100644
--- a/homeassistant/components/climate/nest.py
+++ b/homeassistant/components/climate/nest.py
@@ -187,6 +187,11 @@ class NestThermostat(ClimateDevice):
             device_mode = operation_mode
         elif operation_mode == STATE_AUTO:
             device_mode = NEST_MODE_HEAT_COOL
+        else:
+            device_mode = STATE_OFF
+            _LOGGER.error(
+                "An error occurred while setting device mode. "
+                "Invalid operation mode: %s", operation_mode)
         self.device.mode = device_mode
 
     @property