Service Manual

TESTING
18” & 24” ADA Built-In Dishwashers
n
3-3
IS: Door Switch Detector (+12V)
ISB: Rinse Aid Detector
ML: Wash Pump
P1: Water Level Switch
P2: Dry Heang Protect Switch
PS: Drain Pump
R: Heater
RE: Thermistor (NTC)
TUR: Turbidity Sensor
Wiring Diagram
Schemac shown with door switch and all other normally open contacts open.
For Service Technician Use Only
SERVICE INFORMATION – DO NOT REMOVE
SPECIFICATIONS
Electrical Supply (under load) - 60 Hz – 120 VAC
Supply Water Flow Rate – To ll 3.8 L in 36 seconds, 100 psi maximum and 20 psi minimum.
Supply Water Temperature – 120°F (49°C).
Before Starting Dishwasher - Run water at sink faucet until hot.
Water Charge – Approx. 3.8 L each ll.
Lower Spray Arm Rotation: 20 – 40 rpm
Upper Spray Arm Rotation: 15 – 40 rpm
COMMON CAUSES OF LEAKS
Door Area
• Tub gasket not rmly seated in corners.
• Tub shifted out of square during installation, causing leak in upper corners.
• Spray arm split, open crimp seams, or binding.
• Sudsing, which may be caused by:
o Use of non-dishwasher detergent.
o
Low water temperature should be 120°F to 150°F (49°C to 66°C).
o Inferior dishwasher detergent not suppressing foam.
Lower pump housing and motor area
• Motor shaft seal damaged or defective.
• Pump housing cracked.
• Hose connections loose.
Other Areas
•
Water temperature over 160°F (71°C) causing excessive condensation.
NOTE: Water level after a complete ll should be approximately 2.5” (6.35 cm) above the heating
element.
WASHABILITY COMPLAINTS
Dishes not clean
• Supply water temperature should be 120°F to 150°F (49°C to 66°C) for best results.
• Improper loading.
• Old detergent expired, caked or clumping.
•
Detergent cup is not releasing or is opening too soon.
• Low water ll due to low water supply pressure or clogged water valve.
• Hard water lm (water with 12 grains or more hardness may require a water softener), use
more detergent.
• Etching (usually on glassware), caused by a combination of soft water (0-4 grains), water
temperature over 160°F (71°C), or too much detergent.
Dishes not dry
•
Dishes not loaded to permit proper draining.
• Rinse aid not being used in models equipped with automatic rinse aid dispenser.
•
Supply water temperature under 140°F (60°C). Open faucet to purge cold water out of hot
water line.
• Low voltage power supply.
•
Failed heating element – a good element has a resistance of 29.5 – 32.5 ohms.
Staining
•
Red or brown stains (iron stains) on the tub or dishes may be caused by as little as 1 ppm
of iron in the water supply.
To remove:
o Remove all dishware and silverware.
o Place citric acid in covered cup.
o
Allow dishwasher to run through complete normal cycle uninterrupted. The dry cycle may
be omitted.
• Hard water lm/lm/lime deposit build-up.
To remove:
o
Pour 2 cups of vinegar into empty dishwasher and run through RINSE cycle. Filmed
glasses/dishware may also be cleaned in this manner, but not silverware.
THE DISHWASHER IS PROGRAMMED WITH A SERVICE MODE TO AID
THE TECHNICIAN IN TROUBLESHOOTING THE DISHWASHER. EACH
COMPONENT IS CYCLED TO VERIFY IF IT IS FUNCTIONING CORRECTLY.
TO ENTER SERVICE MODE:
OPEN THE DOOR, PRESS AND HOLD THE START/CANCEL BUTTON WHILE PRESSING THE
CYCLE BUTTON. ALL LED LIGHTS WILL FLASH. CLOSE THE DOOR TO ADVANCE TO STEP 1.
TO EXIT SERVICE MODE:
DISCONNECT POWER TO THE DISHWASHER.
No. Component Note
1Water Valve
Turn on water valve. The ow meter will allow 3 L of
water to come in.
2
Wash Pump
Heater
Turn on the wash pump. After 10 seconds the heater will
turn on. The beeper will sound when the temperature has
risen 3 - 5 degrees. The dishwasher will stop when the
temperature has reached 57°C. Press START to enter the
next step.
3 Dispenser Turn on the dispenser for 45 seconds.
4 Pause Pause for 30 seconds.
5 Drain Pump Turn on the drain pump for 30 seconds.
6 END Beep one time.
Display Error Error Description
E1 Water inlet Failure
During the water inlet step, if the ow meter can’t
detect a correct ll after 4 minutes, E1 will be displayed.
E3 Heater failure
When the temperature doesn’t reach the correct value
after 90 minutes, E3 will be displayed.
E4 Overow
If water ows into the base and activates the ood
detection switch, the dishwasher will display E4.
E6
NTC open circuit
failure
Temperature sensor open circuit.
E7
NTC short circuit
failure
Temperature sensor short circuit.
Failure solutions:
1. If an alarm occurs, the machine will enter a failure solving process: The buzzer sounds once
per second for 30 seconds. The error code will be displayed. During that time, the drain pump
will turn on for 2 minutes.
2. During the drain, if the door is opened, the drain timing will pause.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.
110-127V/60Hz
GN
L
OPTION:
BR
ACN
HEAT-LACL
ACL D/Ed
D/Ed
EV1
EV1
ALT
BR
IS
IS
GY
GY
BR
RD
PS
RD
ORYEBK
PK
P02 ML-H ML-L EV3
PS
R
P1
BU
BU BU
BR
BU
LAMP
BU
FAN1 FAN2
DC
FAN
FAN3
BU
BU
RE
BU
GY
GY
WH WH
WH WH
+12V
+5V TUR
+12V
RD
BR
BK WH
ALT
Turbidy
WH
BK
BK
FM
FM
RE
DOOR
IAQS ISB
BU
C
BU
RD
PK
WH OR RD
BK
ML
Wash
Pump
Heater
RELAY
RELAY
RELAYRELAY
RELAYFuse
Drain
Pump
Inlet
Valve
Dispenser
Diverter
W11223039A
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ACL: L1 (Alternang Current)
ACN: Neutral (Alternang Current)
C: Capacitor
D/Ed: Dispenser
DOOR: Door Switch
EV1: Inlet Valve
FM: Flow Meter
FUSE: Fuse (3.15A)
IAQS: Overow Switch
L1
N
12V
WH
Thermistor Overow Sw. Rinse Aid Det. Flow Meter
N L1
BK
RD
BR
BU
CN4
PO1
14 ohms
25-35 W
21 ohms
24 ohms
High-50 ohms
Low-77 ohms
10µF
140°C
CON2
CN5
CN6
25°C (77°F) 10k W
2
1
PK PK PL
GND
CN6
+12V
+12V
Pressure Sw.
N HEAT-L L
CON1
TURB +5V PWM
CN3
BU
RD
(ACL)(ACN)