– 50 –
Humidity Sensor
This device senses the humidity in the kitchen and
assists the control board in adjusting the wattage
outputs of the 3 mullion heaters accordingly.
The humidity sensor receives a constant 5 VDC from
the main control board (J4-3 to J5-5) and sends
back 1 to 3.6 VDC (J4-3 to J5-6), depending on the
relative humidity. The higher the humidity, the
higher the output voltage. Any output higher than
4 VDC or lower than 1 VDC indicates the sensor has
failed.
F.I. (Field Inspector) Testing – A reading of
approximately 0-100 would be considered normal. A
reading of 150 or higher indicates a failed humidity
sensor.
There is no resistance check for the humidity sensor.
A failed sensor could keep the mullion heaters on for
longer periods.
The humidity sensor is contained in a housing that
is attached to the front of the base with a Phillips-
head screw.
To access the humidity sensor, it is necessary to
remove the 2 Phillips-head screws and the base
grille from the refrigerator.
Humidity Sensor
Humidity Sensor-Front View
Humidity Sensor-Rear View
BLACK (COMM)
13.6V RED
BLUE (COMMON)
YELLOW
+5V BLUE
J5-5
J5-6
MAIN CONTR
OL BO
ARD
J4-3 J4-2 J4-1
1
23
WHITE
HUMIDITY
SENSOR
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