For Service Technician Use Only
COMPONENT TESTING (Cont.)
3-12
n
Whirlpool
®
and KitchenAid
®
Filtration and Maytag
®
24" Microfiltration Dishwashers
Water Heating/Heat Dry
This test will check the wiring to the heater element, hi-limit
thermostat and the heating circuit itself. The following items are
part of the heater circuit:
n
Harness/Connection
n
Heater Coil
n
Hi Limit Thermostat
n
Control Board
Test Procedure
Control is programmed to disable the heater if it detects a
problem with the heating system. This check is performed at the
start of a heating period in each cycle. If heating problem is not
corrected, the control will disable the heater again.
1.
Unplug dishwasher or disconnect power.
2.
Remove toe and access panels to outer door control board.
3.
Disconnect P4 from the control board.
Strip Circuit - Heater Circuit
4.
Using an ohmmeter, measure resistance between P4,
pins 2 and 3.
¾
If the resistance is between 10-40 ohms, go to step 6.
¾
If an open circuit is detected, go to step 5.
5.
Visually check the wire connections between the control
board, the heater element and the hi-limit thermostat. If the
connections look good, check for continuity across the heater
element and the hi-limit.
¾
Replace heater element or hi-limit thermostat if it is
electrically open.
¾
Repair or replace wire harness if test fails continuity.
6.
Reconnect P4 to control board.
7.
Set voltmeter to AC and connect leads to test-pads P4-2 and
P4-3 on the control board. Plug in dishwasher or reconnect
power.
8.
Start the Diagnostics Cycle and at the proper interval
measure for AC out of the control board between P4-2 and
P4-3 using a voltmeter set to AC.
¾
If 120 VAC is measured and heater element is on, go to
step 9.
¾
If no AC voltage is measured, replace control board.
9.
Perform Diagnostics Cycle to verify repair.
¾
If heater related error still exists, perform Water Sensing
test procedure on following page.
10.
Unplug dishwasher or disconnect power.
11.
Reassemble all parts and panels.
12.
Plug in dishwasher or reconnect 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.
L1
BK
Electronic Control
N.O.
K505
Heater L1 Relay
(Also see Door
Switch Circuit)
Hi-Limit
Thermostat
Opens
207°F - 217°F
(97°C - 103°C)
Heater Element
10 Ω - 40 Ω
120 V, 60 Hz
500 W Dry
N.C.
P4-1
P4-2
P4-3
P4-4
N
Electronic Control
N.O.
K504
Heater N Relay
(Also see Door
Switch Circuit)
Heater
BU/WH
WH
BU/RD
BU/RD
Содержание M-17
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