Hi, welcome to Just answer
How old is it ?
OK does it flash any lights ?
OK, Lets check if we can get any error code out of the unit...To do this turn the dial to any setting and let it light up...After this is done press and hold the start button and the button to the left. Keep them held in for several seconds then the led's will go out. Now the start light and the end light will be flashing. Please count the total number of flashes from each the start light and the end light between the pause and let me know.
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OK, have you cleaned the pressure switch like we did last month ?