For Service Technician Use Only
COMPONENT TESTING (Cont.)
Whirlpool
®
and KitchenAid
®
Filtration and Maytag
®
24" Microfiltration Dishwashers
n
3-5
Control Board Information
Specifications
Electrical Supply
: (Under Load): 60 Hz 120 VAC
Supply Water Flow Rate
: To fill 2 qt (1.9 L) in 46 seconds, 120 psi
maximum, 20 psi minimum.
Supply Water Temperature
: 120°F (49°C) (Before starting a cycle,
run water from sink faucet until hot.)
Water Charge
: 1.0 gal. (3.9 L) Approximate
Lower Spray Arm Rotation
: 12 to 40 RPM
Upper Spray Arm Rotation
: 12 to 30 RPM
Fuse Service and Resistance Check
F500 = Small - TRIAC Load Fuse
Check operation of loads during the Service Diagnostics cycle.
n
If any of the TRIAC loads work, F500 Fuse is OK.
n
If all TRIAC loads fail to work, F500 Fuse could be open. See
Fuse Resistance Check.
Fuse Resistance Check:
1.
Unplug the dishwasher or disconnect power.
2.
Measure resistance of F500 Fuse.
NOTE
: Fuses are on the bottom of the Control Board but can be
checked from the top side. See "Control Pin-out" diagram.
¾
If resistance is < 3 Ω, then fuse is OK.
¾
If resistance is > 3 Ω, then fuse is OPEN.
If the fuse is open:
Inspect and check resistance of all loads on fuse. If any loads are
open, shorted, or have evidence of overheating or pinched wires,
replace them.
Component Testing
Testing Dishwasher Components from the Control
Before testing any of the components, perform the following
checks:
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The most common cause for mis-diagnosed control failure
is poor connections. Therefore, disconnecting, inspecting,
and reconnecting wires will be necessary throughout test
procedures.
n
All tests/checks should be made with a VOM or DVM having a
sensitivity of 20,000 ohms-per-volt DC, or greater.
n
Check all connections before replacing components, look for
broken or loose wires, failed terminals, or wires not pressed
into connectors far enough.
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Voltage checks must be made with all connectors attached to
the boards.
n
Resistance checks must be made with power cord unplugged
or power disconnected, and with wiring harness or
connectors disconnected from the control.
n
The testing procedures in this section may require the use
of needle probes to measure voltage. Failure to use needle
probes will damage the connectors.
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.
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