For Service Technician Use Only
COMPONENT TESTING (Cont.)
3-22
n
Whirlpool
®
and KitchenAid
®
Filtration and Maytag
®
24" Microfiltration Dishwashers
DC Fan Motor
This test will check the wiring to the DC fan motor and the fan
motor itself. The following items are part of the DC Fan Motor
circuit:
n
Harness/Connection
n
DC Fan Motor
n
Control Board
Test Procedure
1.
Check for fan operation in the Diagnostics Cycle. The DC fan
should be running during step 4.
2.
Unplug dishwasher or disconnect power.
3.
Remove toe and outer door panels to access control board.
Strip Circuit -DC Fan Motor
4.
Unplug connector P14 from control board.
5.
Check the fan motor using an ohmmeter, measure the
resistance between P14-1 and P14-2.
¾
If the resistance is between 145k-185k ohms, the fan
motor and harness are good. Go to step 7.
¾
If outside the range, replace the fan motor assembly.
¾
If an open circuit is detected, check connections and
harness continuity between control and fan motor. If
good, replace the fan motor assembly.
6.
Reconnect P14 to control board.
7.
Set voltmeter to DC and connect leads to test-pads
P14- 1 and P14-2 on the control board. Plug in dishwasher or
reconnect power.
8.
Start the Diagnostics Cycle and at the proper interval
measure for DC out of the control board between P14-1 and
P14-2 (Refer to DC Fan Motor Strip Circuit below).
IMPORTANT:
The Fan Motor must be connected to the
control board to measure voltage accurately.
¾
If no DC voltage is measured, replace the control board
and retest.
¾
If 13 VDC ± 5% is measured and the fan is spinning, go to
step 9.
9.
Unplug dishwasher or disconnect power.
10.
Reassemble all parts and panels.
11.
Plug in dishwasher or reconnect power and run Diagnostics
Cycle to verify repair.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
Electronic Control
P14-1
Electronic Control
P14-2
Ref
13 VDC
Pin 1
Pin 3
Fan Motor
13 V / 1 W
145 - 185 kΩ