Temperature Sensor And Soil Sensor; Checking The Thermistor - Electrolux 5000 Series Service Manual

CYCLE, SYSTEMS & COMPONENTS

TEMPERATURE SENSOR AND SOIL SENSOR

The electronic control reads information from two sensors to adjust the wash
cycle. The Thermistor and soil sensor are integrated into the same housing
mounted to the right side of the sump. Both sensors extend into the
outer section of the sump to perform independent tasks.
The electronic control uses the Thermistor to monitor the
temperature of the water in the dishwasher. The turbidity or soil
sensor is used to monitor soil levels during a wash cycle. A small
amount of DC power is sent to the soil sensor emitter mounted in
one of the posts of the sensor housing. This emitter turns DC power
into a small beam of light to be transmitted to a detector in the other
post. As this light passes from one post to another, the amount of
soil in the water partially blocks the light seen by the detector. The
detector changes this light back into DC voltage which returns to the
control for analysis.
The level of soil in the water can be determined by this returned
voltage. Based on this information, the control makes adjustments
to the remainder of the wash cycle.

Checking the Thermistor

Refer to Water Temperature Test Mode on page 11
to check the temperature of the thermistor.
Thermistor
Sensor mounted into sump
Thermistor
Turbidity
Sensor
Figure 16 Sensor with seal
17
Figure 15