There is no error code 4
The unit is probably set at 4 hours operation.
To change it turn unit off then back on
Now press and hold up arrow ti'll the unit beeps
now press and hold down arrow ti'll unit beeps again
Now either quickly press the up arrow or down arrow until you get the hours of operation you desire
once you have the hours flashing simply re-peat the long holding of the up arrow ti'll it beeps and down again ti'll it beeps once the beep then the # will quit flashing wait 10 minutes or so for chlorine generator to start
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