Arduino + Unity + 240v Mains Fan

int fanPin = 3;
int incomingByte[2];
boolean FAN = false;

//Waits for 'L1' and 'L2' to be received via COM**
//L1 = ON
//L2 = OFF

void setup()
{
  pinMode(fanPin, OUTPUT);
  digitalWrite(fanPin, LOW);

  Serial.begin(19200);
}

void loop()
{

  if (Serial.available() > 0)
  {
        while (Serial.peek() == 'L')
      {
        Serial.read();
        incomingByte[0] = Serial.parseInt();

        if(incomingByte[0] == 1)
        {
          FAN = true;
          //Serial.write("HI");
        }
        else
        {
          FAN = false;
          //Serial.write("LOW");

        }
      }
    while (Serial.available() > 0)
    {
      Serial.read();
    }

    FanCheck();
  }
}

void FanCheck()
{
  if (FAN)
  {
    digitalWrite(fanPin, HIGH);
  }
  else
  {
     digitalWrite(fanPin, LOW);
  }
  return;
}