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Automatic Purge Filtration
1. The Automatic Purge Filtration feature may be invoked if the soil sensor detects excessive
soils. This can occur during selected wash or rinse functions. APF mode provides one or
more purges of excess soils trapped in the soil accumulator at specified intervals in a cycle.
2. The APF mode operates for a total of 10 seconds while the wash pump is operating in a wash
or rinse mode. The accumulator screen will be cleaned from jets on the underside of the lower
spray arm. (2)
3. During the first five seconds, the drain pump turns on and the fill valve is activated. This
purges the soiled water from the accumulator and begins to add fresh water. (3)
APF Function
First Five Seconds
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4b
4a
APF Function
Last Five Seconds
4. For the remaining five seconds, the drain pump is turned off, (4a) but the fill valve remains
activated to bring wash water up to the proper level. (4b)
Theory Resources
The tech sheet, found behind the access panel provides a Common Cycle Time Chart. This chart will
allow the service technician to identify and track each operation of the dishwasher by timed interval.
See Section Four, Troubleshooting and Diagnosis for instruction on how to use this chart with the
Diagnostic Routines built into the electronic controls of the dishwasher.