Icons support was removed a while back in favor of customizations. (home-assistant#2022)

aequitas · fabaff · commit a252ebadfc55 · 2017-02-13T14:08:23.000+01:00
diff --git a/source/_components/switch.rflink.markdown b/source/_components/switch.rflink.markdown
@@ -34,10 +34,8 @@ switch:
   devices:
     newkaku_0000c6c2_1:
       name: Ceiling fan
-      icon: mdi:fan
     conrad_00785c_0a:
       name: Motion sensor kitchen
-      icon: mdi:run
 
 ```
 
