Fine tuning P,I,D.
Press "SET" for a few seconds till appearing "P", click "SET" will appear I, and D.
#1,set I=0, D=0 and try different P value. Draw grahping of temperature vs time for different value of P
You will find best value of P
#2, Using above P or a little smaller, set D=0, and try different I, drawing graph again
you will find best I
#3, Uing about P,I and try different D, drawing graph, you will find D.
By fine tuning PID, you will shorten "learning" period and less temperature swing