Service Manual
Table Of Contents
- W11187658-18" & 24" ADA Models Built-In Dishwashers
- Table of Contents
- Section 1: General Information
- Section 2: Diagnostics & Troubleshooting
- Section 3: Testing
- Section 4: Component Access
- Removing the Tub Gasket and Trim
- Removing the Outer Door Panel
- Removing the Control Panel
- Removing Door Switch Assembly
- Removing Dispenser Assembly
- Replacing the Inner Door Panel
- Removing the Air Breaker Assembly
- Removing the Nozzle Duct
- Removing the Control Board
- Removing the Water Valve
- Under Tub Components
- Removing the Pressure Switch
- Removing the Drain Pump
- Removing the Thermistor & Turbidity Sensor
- Removing the Heating Element
- Removing the Wash Pump Assembly
- Removing the Sump Assembly
- Product Specifications & Warranty Information
TESTING
18” & 24” ADA Built-In Dishwashers
n
3-13
For Service Technician Use Only
Overow Switch
The overow switch is located under the tub and is aached to
the drip pan (see Figure 1).
Foam
Float
Overow
Switch
Figure 1 - Overflow Switch Assembly
The overow switch is a normally closed switch that is used to
detect a possible overow condion. If water drips onto the
STRIP CIRCUIT - OVERFLOW SWITCH
Figure 2 - Overflow Circuit
drip pan, the water will li the foam oat and open the switch.
This will signal the control to shut o the water inlet valve and
acvate the drain pump. An “E4” Overow Error Code will be
generated.
NOTE: If the overow switch is disconnected or open, the
dishwasher will not start a cycle or perform diagnoscs.
Test Procedure
This test will check the wiring to the Overow Switch, the
switch itself, and the control board. The following items are
part of the Overow circuit.
n Harness/Connecon
n Overow Switch
n Control Board
1. Unplug dishwasher or disconnect power.
2. Remove access panel. Remove control board cover to
access control board.
3. Lay the dishwasher on its back. Use a small at-blade
screwdriver to unclip snaps around the drip-pan. Pull
away drip-pan but keep oat switch harness connected.
4. Disconnect CN4 from the Control Board.
5. Check the overow switch—using an ohmmeter, measure
the resistance between CN4-2 and CN4-3 with the
overow switch closed/oat down (normal posion).
¾ If 3 ohms or less is measured, go to step 6.
¾ If an open circuit or high resistance is measured, check
connecons and harness connuity between the
control board and overow switch. If harness is good,
replace switch and retest.
6. Using an ohmmeter; measure the resistance between
CN4-2 and CN4-3 with the overow switch open/oat up.
¾ If reading is innite, go to step 7.
¾ If 3 ohms or less is measured, or oat/overow switch
is damaged, replace switch and retest.
7. If the preceding steps did not correct the overow switch
problem, replace the control board and retest.
8. Unplug dishwasher or disconnect power.
9. Reassemble all parts and panels.
10. Plug in dishwasher or reconnect power and run Service
Mode Test on page 2-3 to verify repair.
CONTROL BOARD
OVERFLOW SWITCH
CONTROL BOARD
CN4-2
CN4-3
Overow Switch (NC)
(IAQS)
GY
PL
(GND)
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.