96
Inline Water Heater
USE EXTREME CAUTION WHEN SERVICING THE INLINE WATER HEATER. THE EXTERNAL
BODY OF THE HEATER WILL BECOME VERY HOT WHEN ENERGIZED. A LARGE BARE CON-
DUCTOR IS EXPOSED ON THE BODY OF THE WATER HEATER, RUNNING DIAGONALLY
FROM FRONT TO BACK. THIS CONDUCTOR IS “LIVE” WHEN THE PRODUCT IS PLUGGED
IN, DO NOT TOUCH.
The inline water heater is located in the base area. Water flows from the sump to the circulation
pump while passing through the heater. It has a flow-thru design and is a round cylinder, similar to
a pipe. When supplied with 120VAC at terminal P5 on the power board, the heater begins to heat.
“USE EXTREME CARE WHEN SERVICING” If water does not flow through the heater when ener
-
gized, it will overheat very quickly. The unit is equipped with internal overload protection and will
automatically shut down at pre-determined temperatures. The “Automatic reset temp” is 208 deg.
F +/- 10 deg, and the “Permanent disabling temp” is 402 deg F +/- 18 deg.
The resistance of the heating element should measure between 11 & 13 ohms. Change the hoses
if the inline heater was operated without water. If this condition was suspected, change the hoses.
Membrane Keypad
The membrane keypad is used to enter the desired wash cycles, wash options and user
commands. During a wash cycle the membrane keypad displays the selected cycle, the estimated
completion time and any options that have been selected. Upon completion of a cycle the keypad
membrane will indicate ompletion of the selected cycle and selected options.
Refer to the Wiring Diagram (page 45) for schematic of Membrane Keypad located on the bottom
left of the diagram.
Power Board
The power board, located in the base area of the dishwasher, takes commands sent from the
control board and regulates power to the various components of the dishwasher by turning on and
off corresponding relays according to the program selected by the user. It receives information
from various sensors and converts the information into data the control board can understand
before transfer to the control board.
The power board also houses the power supply transformer. This component transforms 120V AC
power and distributes it to a variety of electronic components, including the control board.
If during the FTM the scheduled component’s connector fails to energize, the respective relay on
the Power Board could have failed. In this case, it will be necessary to replace the Power Board.
For example: A problem is suspected with the detergent dispenser. Initiate the FTM and follow the
timing chart on page xxxx. The Controller issues a command to the Power Board to energize P7
pin 4 and open the dispenser door for 5 seconds just after the circulation pump turns off. If dur-
ing that window of time, 120V cannot be detected at P7 pin 4 then the Power Board is defective
and needs replacement.
!
