The Humidity Sensor - Whirlpool KM-24 Owner's Manual

The Humidity Sensor is used during the "Sen-
sor Cook" operation of the oven. It is mounted
inside a cutout area on the left side of the top
cover (see the illustrations).
To access the humidity sensor:
1, Remove the top cover screws.
2. Lift the left side of the cover and slide the
sensor bracket out of the cover slots from
the bottom.
3. Remove the two screws from the sensor
and remove it from the bracket, then un-
plug the 3-pin connector from the elec-
tronic control board.
The sensor consists of two circuits in the
microcomputer board on the electronic control
panel. The microcomputer supplies a current
to the sensor which keeps it heated. The sen-
sor heat conductivity will vary, depending upon
the humidity of the oven. Changing humidity

THE HUMIDITY SENSOR

Humidity
Sensor
- 6 -
conditions, due to the cooking process within
the oven cavity, causes a difference in poten-
tial between these two circuits. This difference
is monitored by the microcomputer during cook-
ing, allowing the microcomputer to determine
the proper cook time.
NOTE: Always verify that the sensor cover is
not obstructed (proper air flow is passing over
the sensor), and that the fan motor is working
properly, before replacing the sensor.
To test the humidity sensor:
1. Set the ohmmeter to the R x 1 scale.
2. Touch the ohmmeter leads to the follow-
ing pins on the sensor connector:
a) Pins 1 & 2 = 2.8 KΩ.
b) Pins 1 & 3 = 2.8 KΩ.
Top Cover
Slide Humidity & Cavity
Thermostat out of cover
viewed from under
top cover