GE ZBD5900 Technical Service Manual page 24

4.5.2.2 FILL & CIRCULATE MODE - 80 SECONDS DEFAULT FILL TIME (step 4):
Upon the start of a program, the dishwasher is under control of a fill time step within the timer control. A default time of 80
seconds is factory set. Selection of an additional 20 seconds is possible by engaging the fill time switch, which is located
behind the electrical access panel (refer to section 5.1). With the fill time switch engaged, the total fill time is 100 seconds.
The timer control will then advance the initial 80 second step to the additional second step of 20 seconds.
The Fill & Circulate mode (80 seconds) has three main control circuits illustrated in the wiring diagram.
Circuit Diagram: Fill and Circulate 80 Seconds Default Fill Time (Step 4)
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