Digital Display no longer readable

[breen]

The LED display on my 4 rack smoker no longer shows all the numbers.
I assume the timers start at 0, please advise how may minutes are added by each push of the up arrow?
Likewise, does the temp come on at a preset number?
What is it?
How many degrees does it increase for each arrow push?

Thanks!!!

[Olev]

time is increased by 20 min intervals for each push.
Temperature increase is 10 degrees per push.

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