Service Manual

3-14
n
18” & 24” ADA Built-In Dishwashers
TESTING
For Service Technician Use Only
Flow Meter
Test Procedure
This test checks the electrical connecons to the ow meter
and the ow meter itself.
1. Perform the “Service Mode Test” on page 2-3. If error
code E1 is generated, the dishwasher is detecng less
than 3 L of water aer 30 seconds of starng the test. Go
to step 2.
2. Did the water inlet valve turn on and was water heard
entering the tub?
¾ No, the valve did not turn on. Go to Water Inlet Valve
test on page 3-8.
¾ Yes, the valve turned on, but no water entered the
drum. Go to step 3.
¾ Yes, the valve turned on and water entered the drum.
Go to step 4.
3. Verify the water supply is turned on and supply line is
adequate. Check for debris in the water line or ll valve
inlet screen. Repair as necessary and retest.
4. Unplug dishwasher or disconnect power.
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 - FLOW METER
Figure 2 - Flow Meter Strip Circuit
5. Remove access panel. Remove control board cover to
access control board.
6. Unplug connector CN4 from control board.
7. With an ohmmeter, check the harness between the
Control Board (CN4) and ow meter for connuity.
¾ If there is connuity, go to step 8.
¾ If there is no connuity, replace the harness.
8. With voltmeter set to DC, connect leads to CN4, pins 2
and 4. Run a wash cycle and measure the ow meter
voltage when the inlet water valves open and water is
entering the washer. A nominal reading of approximately
1.9 VDC should be measured when water is owing
through the ow meter (voltage will vary depending on
household water pressure). No water owing = 0V.
¾ If voltage is present, the ow meter is working
properly. Go to step 9.
¾ If voltage is not present when water is entering the
washer, replace the ow meter.
9. If the preceding steps did not correct the ll problem,
replace the Control Board.
¾ Unplug dishwasher or disconnect power.
¾ Replace the Control Board.
¾ Reassemble all parts and panels.
¾ Perform the “Service Mode Test” on page 2-3 to verify
repair.
CONTROL BOARD
FLOW METER SWITCH
CONTROL BOARD
CN4-2
CN4-4
Flow Meter
(FM)
BK
PL
(GND)
GND
+5VDC
Flow
Meter
Figure 1 - Flow Meter in Air-break Assembly