Sears Kenmore 630.13902 Manual page 20

COMPONENTS
m
CAUTION: Inner door edges are sharp! Cover door edges and remove
dispenser carefully.
Optical rinse-aid sensors
Optical rinse-aid sensors determine if rinse-aid is present using a light beam
and sensor.
TIP:
adequately to show rinse-aid isn't needed.
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It's possible for some clear rinse-aid brands to not diffuse light
With rinse-aid present, the optical
receiver senses a diffused light
beam.
When rinse-aid has run out, the
optical receiver senses a strong
light beam.