what i meant was that i removed those lines of code. now im using the following which is without the other features i was planning to implement. below is the latest code.

Code:
Define	LCD_DREG	PORTB
Define	LCD_DBIT	0
Define	LCD_RSREG	PORTB
Define	LCD_RSBIT	5
Define	LCD_EREG	PORTB
Define	LCD_EBIT	4
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2

mode var byte
keyin var byte
adval var word
tempc var word
highpt var byte
lowpt var byte
highled var porta.1
lowled var porta.2
relayhigh var porta.3
relaylow var porta.4
up var portc.0
down var portc.1
sethighp var portc.2
setlowp var portc.3
maindisp var portc.4
highpt = 100
lowpt = 0
trisc= %00011111
trisa=%00000001
adcon1=%10001110
adcon0=%11000001

pause 100

lcdout $fe , 1
mode = 1
goto main

getkey:
pause 50
keyin = portc
return

gettemp:
    adcon0.2=1
    pause 1
    
checkdone:
    if adcon0.2=1 then checkdone

    adval.highbyte=adresh
    adval.lowbyte=adresl

    tempc=50*adval
    tempc=tempc/100
	   
    If tempc>=highpt then
        high highled
        high relayhigh
    else
        low relaylow
        low lowled
        
endif

    If tempc<=lowpt then
        high lowled
        low relaylow
    else
        low relayhigh
        low highled
       
endif

return

main:
        gosub gettemp
        gosub getkey
        
if maindisp = 0 then mode = 1
pause 50
if sethighp = 0 then mode = 2
pause 50
if setlowp = 0 then mode = 3
pause 50
       
select case mode

case 1
            write 0 , sethighp
            pause 10
            write 1 , setlowp
lcdout $fe , 1
Lcdout "TEMP = ",DEC tempc,$DF,"C"

case 2
lcdout $fe , 1
lcdout $fe , $80 , "High Setpoint:" , $fe , $c0 , dec highpt, $DF , "C"
if up = 0 then highpt = highpt + 1
pause 50
if down = 0 then highpt = highpt - 1
pause 50
if highpt>100 then highpt=100
pause 50

case 3
lcdout $fe , 1
lcdout $fe , $80 , "Low Setpoint:" , $fe , $c0 , dec lowpt, $DF , "C"
if up = 0 then lowpt = lowpt + 1
if down = 0 then lowpt = lowpt - 1
if lowpt>100 then lowpt=100
end select
goto main
im realy desperate to get this thing working guys....