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SERVICE MANUAL
Checking the WATER SOLENOID VALVE
Service
High
Ready
Low
Dev. Temperature
H164_0034AC
[3] If the WATER SOLENOID VALVE does not operate, check the input voltages:
Position on the DRIVE BOARD
P1 (GND), PIN 1 on U1
P1 (GND), PIN 1 on U1
[4] Are the voltages correct?
Yes
Continue with
Step
[5] If the input voltages are correct and the SOLENOID VALVE does not operate, check the output voltages:
Position on the DRIVE BOARD
PIN 1 to PIN 2 on CNP6 on the DRIVE BOARD
PIN 1 to PIN 2 on CNP6 on the DRIVE BOARD
[6] Are the output voltages correct?
a. Check the WATER SOLENOID VALVE.
b. If necessary, install a new WATER
SOLENOID VALVE.
76
RUN
DEV.
FIX.
Rep.
5.
a. Check:
• I/O BOARD
• I/O BOARD/DRIVE BOARD CABLE
b. If necessary, install a new part.
Yes
[1] Enter mode 6. See
[2] Press and hold the "RUN" BUTTON on the
CONTROL BOARD.
Note
• Pressing and holding the "RUN" BUTTON:
– actuates the circuit for the WATER SOLENOID
– illuminates LED 11 on the DRIVE BOARD
• LED 6 might illuminate for 0.5 seconds, but LED 6
is not used in this evaluation.
"RUN" BUTTON
pressed
released
No
"RUN" BUTTON
pressed
released
No
a. Check the DRIVE BOARD.
b. If necessary, install a new DRIVE BOARD.
Setting the Diagnostic
Voltage
0 - 1 V DC
4 - 5 V DC
Voltage
9 V DC, following a
24 V DC pulse
0 V DC
10SEP02 – 9B8949
Modes.
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