diff --git a/src/SerialCmd.cpp b/src/SerialCmd.cpp
index aeae799..978c156 100644
--- a/src/SerialCmd.cpp
+++ b/src/SerialCmd.cpp
@@ -60,7 +60,9 @@ int SerialCmd_readFromSerial (void)
   }
   else if(inputSize >= CMD_MAX)
   {
-    Serial.flush();
+    for (int i = 0; i < inputSize; i++){
+      Serial.read();
+    }
     Serial.print("too much data, flush");
   }
   return inputSize;
diff --git a/src/main.cpp b/src/main.cpp
index 5b49ee4..4585b20 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,7 +28,7 @@
 
 #define DELAY_TIME            1000 /**< time between measurements [ms] */
 #define MIN_FAN_SPEED_PERCENT 24 /**< minimum fan speed [%] */
-#define MIN_TEMP              25 /**< turn fan off below [deg C] */
+#define MIN_TEMP              27 /**< turn fan off below [deg C] */
 #define MAX_TEMP              40 /**< turn fan to full speed above [deg C] */
 #define INVALID_TEMP          (MAX_TEMP+MAX_TEMP) /**< Invalid temperature (on sensor failures)*/
 
@@ -37,6 +37,8 @@
 
 #define RPM_CONTROL_DEACTIVATED -1
 
+#define TEMPERATUR_HIGHVALUE  MAX_TEMP
+
 /******************* Settings for command mode ***************/
 #define COMMAND_BRIGHTNESS    200
 #define PERCENT_MAX           100
@@ -199,7 +201,8 @@ void loop()
     
     if(checkCmd == 0)
     {
-       Serial.println(F("if you dont know what to do type \"" SERIALCMD_COMMAND_HELP  "\""));
+      Serial.println(F("if you dont know what to do type \"" SERIALCMD_COMMAND_HELP  "\""));
+      pixels->setBrightness(0);
     }
     else
     {
@@ -223,6 +226,10 @@ void loop()
             mAutomaticTargetRPM = PERCENT_MAX;
         }
         break;
+        default:
+          pixels->fill(Color(0,0,0));
+          pixels->setBrightness(0);
+          break;
       }
     }
   }
@@ -240,7 +247,15 @@ void loop()
   Serial.print(actualFanSpeedRpm);
   Serial.println("RPM");
 
-  singleLed->fill(Color(0,128,128));
+  if (temp < TEMPERATUR_HIGHVALUE)
+  {
+    singleLed->fill(Color(0,128,128));
+  }
+  else
+  {
+    singleLed->fill(Color(255,0,0));
+  }
+
   singleLed->setBrightness(fanSpeedPercent);
   singleLed->show();
 }