– 21 –
Pressure Sensor
The pressure sensor is connected by a clear hose to
an air reservoir near the bottom of the outer tub and
operates by a frequency (kHz) signal to the inverter
board.
The pressure sensor wires (violet, orange, and pink)
are connected at pins 1, 2, and 3 at CN1 on the PCB.
(See
Circuit Board Connections.
)
The approximate resistance value of the transducer,
measured between the pink and violet wires, is
approximately 23
Ω
.
When the water level rises in the washer tub, air is
trapped in the reservoir. As the water level rises, the
air pressure in the reservoir increases.
The pressure is translated into an electrical
•
signal (frequency) by the pressure sensor.
The frequency will vary from approximately 27
•
kHz (empty tub) to 22 kHz (full tub).
This frequency can be measured at the pressure
•
sensor between the orange and violet wires.
LEVEL
GALLONS FREQUENCY (kHz)
EMPTY
0
25.2
EXTRA SMALL
8.00
24.1
SMALL
10.6
23.43
MEDIUM
12.4
23.03
LARGE
13.2
22.80
EXTRA LARGE
19.6
22.13
Pressure Sensor Test
If the pressure sensor is not operating correctly,
perform the following test:
Operate the washer on the spin cycle until all
remaining water is drained from the washer.
Clear the pressure switch air tube of any
obstructions such as lint, detergent or fabric
softener deposits, or foreign objects.
Check the approximate water levels at each load
selection. Water levels are measured from the
bottom of the wash basket:
EXTRA SMALL
- 5 ½ inches
SMALL
- 6 ¾ inches
MEDIUM
- 7 ½ inches
LARGE
- 8 ¾ inches
EXTRA LARGE
- 11 ¾ inches
The frequency is monitored by the PCB, which turns
off the water valves when the desired water level is
achieved.
Note:
The water level will vary slightly depending
on the load size, which is measured by the weight
recognition function and any supplementary water
needed. This information is sent to the PCB, which
then determines the appropriate water level.
Extra Small Water Level Shown
CN1
(
Continued next page
)
