Drain Motor - 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.

Drain Motor

This test will check the wiring to the drain motor and the drain
motor itself. The following items are part of the drain motor
circuit.
n Harness/Connection
n Drain Motor
n Control Board
Test Procedure
1. Verify that drain hose or drain path is not obstructed.
Check for blockage from sump check valve to customer's
plumbing. Check for plugged garbage disposal or disposal
plug not knocked out. Check drain loop, stuck check valve,
or for plugged hoses. Repair as needed.
2. Check the drain motor and electrical connections by
performing the Service Diagnostic Cycle. The following
steps assume that this step was unsuccessful.
Strip Circuit – Drain Motor
L1
BK
L1
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.
3. 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 drain motor. Go to step 4.
4. Unplug dishwasher or disconnect power.
5. Remove toe and access panels to access control board.
6. Unplug connector P6 from control board.
7. Check the drain motor—using an ohmmeter, measure the
resistance between P6-1 and P6-3.
¾ If the resistance is between 15-25 ohms, the drain
motor and harness are good. Go to step 8.
¾ If outside the range, replace the drain motor.
¾ If an open circuit is detected, check connections and
harness continuity between control and drain motor. If
good, replace the drain motor.
8. Reconnect P6 to control board.
9. Set voltmeter to AC and connect leads to test-pads P10-
1 & P6-1 on the control board. Plug in dishwasher or
reconnect power.
10. Start the Diagnostic Cycle and at the proper interval
measure for AC out of the control between P10-1 & P6-1.
(Refer to Drain Motor Strip Circuit below.)
IMPORTANT: The Drain 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 drain motor is running, go
to step 11.
11. Unplug dishwasher or disconnect power.
12. Reassemble all parts and panels.
13. Plug in dishwasher or reconnect power and run Diagnostic
Cycle to verify repair.
BR
P6-3
Pin 1
P10-1
Drain Motor
15Ω - 25Ω
120V, 60 Hz, 45W
KitchenAid 2015 Microfiltration Dishwashers
Dispenser Wax Motor
1.4KΩ - 2.8KΩ
120V, 60 Hz, 10W
Pin 1
BR
P4-1
P6-1
Pin 3
Triac
Electronic Control
Pin 5
TESTING
N
WH
n
6-15
N
WH