I wrote a small program to switch the led on off with delay and write something on the LCD on off with delay and this works on Proteus and hardware.

Please assist

// LCD module connections
sbit LCD_RS at RB0_bit;
sbit LCD_EN at RB1_bit;
sbit LCD_D4 at RB2_bit;
sbit LCD_D5 at RB3_bit;
sbit LCD_D6 at RB4_bit;
sbit LCD_D7 at RB5_bit;

sbit LCD_RS_Direction at TRISB0_bit;
sbit LCD_EN_Direction at TRISB1_bit;
sbit LCD_D4_Direction at TRISB2_bit;
sbit LCD_D5_Direction at TRISB3_bit;
sbit LCD_D6_Direction at TRISB4_bit;
sbit LCD_D7_Direction at TRISB5_bit;
// End LCD module connections

unsigned int read_value=0, ref_value;
unsigned int value=0;
unsigned int temp;
char aux[7];

void main()
{
  RD0_bit = 0;
  RD1_bit =0;
  ADCON1 = 0x00; // All channels are config as analog I/p.

  ADC_Init();
  Lcd_Init(); // Initialize LCD
  Lcd_cmd(_lcd_clear);
  Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
  Lcd_out(1,3,"Temperature:");
  LCD_Out(2,1,"Eff:    Ref:");

  while(1)
  {
    read_value = Adc_Get_Sample(2)>>2;
    ref_value  = ADC_Get_Sample(4)>>2;

    if (read_value < ref_value)
    {
      PORTD.RD0 = 1;
      if (read_value > ref_value)
        PORTD.RD1 = 1;
      else
        PORTD.RD1 =  0;
      PORTD.RD0 = 0;
    }

    value = (unsigned int) read_value * (500./255); // Resolution for 5 volts, 8 bits
    ByteToStr(value,Ltrim(aux));
    LCD_Out(2,5, aux); //shows reading temperature

    value = (unsigned int) ref_value * (500./255);
    ByteToStr(value,Ltrim(aux));
    LCD_Out(2,13, aux); //shows reference temperature

    delay_ms(50);
  }
}