Just ran a charge my minimum charge is 5.00 I ended the charge at 5.31 and it charged 5.25 the system rounds back to the nearest quarter as it always has.
Have you programmed the timer to say PRESS FLASHING GREEN BUTTON WHEN FINISHED? I did this and it did help if scrolls it when running a credit card charge
If the check valve is bad and the pressure switch is bad and not letting the pressure off the head it will usually trip out because most can’t start under load.
Had a Kondor doing something similar it turned out to be the sonar tipped the sonar about 1/2-1 bubble on the level towards the drivers side on both and the problem was gone. It had something to do with bouncing back to the ceiling telling it it was ok to butterfly