Service Manual

TESTING
18” & 24” ADA Built-In Dishwashers
n
3-9
For Service Technician Use Only
Dispenser Circuit
The detergent/rinse module automacally dispenses both the
detergent and the rinse agent at the appropriate mes. The
module is acvated ve mes during a wash cycle. Detergent is
dispensed at the beginning of the main wash cycle for one me
and rinse agent at the beginning of the nal rinse for four mes.
This test will check the wiring to the dispenser and the
dispenser solenoid itself. The following items are part of the
dispenser circuit.
n Harness/Connecon
n Dispenser Solenoid
n Control Board
Test Procedure
1. Check for obstrucons or mechanical binding prevenng
the dispenser lid from opening. Repair or replace as
necessary.
2. Unplug dishwasher or disconnect power.
3. Remove access panel. Remove control board cover to
access control board.
4. Unplug connector CN6 & CN5 from the control board.
5. Check the dispenser and harness—using an ohmmeter,
measure the resistance between CN6-2 (D/Ed) and CN5-2
(IS).
¾ If the resistance is approximately 21 ohms, the
dispenser solenoid and harness are good. Go to step 7.
¾ If outside the range, replace the dispenser assembly.
¾ If an open circuit is detected, check connecons and
harness connuity between control and dispenser. If
good, replace the dispenser assembly.
6. Reconnect CN6 & CN5 to control board.
7. Set voltmeter to DC and connect black lead to CN6-2 (D/
Ed) and red lead to CN5-2 (IS) on the control board. Plug
in dishwasher or reconnect power.
8. Start the Service Mode Test and at step-3 measure for 12
VDC out of the control between CN6-2 and CN5-2. (Refer
to the Dispenser Strip Circuit below.)
IMPORTANT: The Dispenser must be connected to the
control board to measure voltage accurately!!!
¾ If 12 VDC is not measured, replace the control board
and retest.
¾ If 12 VDC is measured and dispenser is energized, 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 Service
Mode Test 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.
STRIP CIRCUIT - DISPENSER
Figure 2 - Dispenser Strip Circuit
CONTROL BOARD
21 Ohms
DISPENSER
CN5-2
CONTROL BOARD
CN6-2
DISPENSER
SWITCH
12V
GND
(IS)
(D/Ed)
GY
BU
Dispenser Solenoid
Dispenser Solenoid
Connector
Rinse Aid Detection
Connector
Figure 1 - Dispenser Assembly