Dispenser Circuit - KitchenAid KMTM704E Series Technical Education

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.

Dispenser Circuit

This test will check the wiring to the dispenser and the
dispenser solenoid or wax motor itself. The following items
are part of the dispenser circuit.
n Harness/Connection
n Dispenser Solenoid/Wax Motor
n Control Board
Test Procedure
1. Check for obstructions or mechanical binding preventing
the dispenser lid from opening. Repair or replace as
necessary.
L1
2. Are all the loads controlled by TRIACs not working?
¾ YES – check for open door switch, TRIAC fuse, or pilot
relay.
¾ NO – just the Dispenser. Go to step 3.
BK
3. Unplug dishwasher or disconnect power.
Strip Circuit – Dispenser
L1
BK
For Service Technician Use Only
Use top hole of jumper
W2 as test point for F9.
N.O.
P4-2
K2
Pilot L1 Relay
Fuse
(Also see Door
F9
Switch Circuit)
Electronic Control
No test pad on P6-3.
Recommend using test pad on P10-1.
Electronic Control
Use top hole of jumper
W2 as test point for F9.
N.O.
P4-2
K2
Pilot L1 Relay
Fuse
(also see Door
F9
Switch Circuit)
Test pad on P9-3 might crowd P9-1.
Recommend using test pad on P10-1.
4. Remove outer door panel to access dispenser and remove
toe and access panels to access control board.
5. Unplug connector P9 from control board.
6. Check the dispenser solenoid or wax motor (depending
on model) and harness—using an ohmmeter, measure the
resistance between P9-1 and P9-3.
Solenoid:
¾ If the resistance is between 260-300 ohms, the
solenoid valve and harness are good. Go to step 7.
¾ If outside the range, replace the dispenser solenoid.
¾ If an open circuit is detected, check connections and
harness continuity between control and dispenser. If
good, replace the dispenser solenoid.
Wax Motor:
¾ If the resistance is between 1.4-2.8K ohms, the wax
motor and harness are good. Go to step 7.
¾ If outside the range, replace the dispenser wax motor.
¾ If an open circuit is detected, check connections and
harness continuity between control and dispenser. If
good, replace the dispenser wax motor.
7. Reconnect P9 to control board.
8. Set voltmeter to AC and connect leads to test-pads P10-
1 & P9-1 on the control board. Plug in dishwasher or
reconnect power.
9. Start the Diagnostic Cycle and at the proper interval
measure for AC out of the control between P10-1 to P9-1.
(Refer to the Dispenser Strip Circuit below.)
IMPORTANT: The Dispenser Solenoid or Wax Motor must
be connected to the control board to measure voltage
accurately!!!
¾ If no AC voltage is measured, replace the control board
and retest.
¾ If 120 VAC is measured and dispenser motor/solenoid
is energized, go to step 10.
10. Unplug dishwasher or disconnect power.
11. Reassemble all parts and panels.
BR
P6-3
12. Plug in dishwasher or reconnect power and run Diagnostic
Pin 1
Cycle to verify repair.
P10-1
Drain Motor
15Ω - 25Ω
120V, 60 Hz, 45W
Dispenser Wax Motor
1.4KΩ - 2.8KΩ
120V, 60 Hz, 10W
Pin 1
V
P9-3
Pin 1
Dispenser Solenoid
P10-1
260Ω - 300Ω
120V, 60 Hz, 17W
KitchenAid 2015 Microfiltration Dishwashers
Diverter Sensor
N
BR
P6-1
Pin 3
Triac
Electronic Control
Pin 5
V
P4-1
P9-1
Pin 3
Triac
Electronic Control
N.O.
TESTING
N
WH
P4-1
N
WH
n
6-9