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②Fault locating method for the control system/circulation system
(a) When the pump motor and all the solenoid valves are not operated, the multi-
power supply (24 V system) is abnormal.
(b) If the electric parts (pump motor and solenoid valve) are not operated in any case
other than the above, make the following checks first. When the criterion is
satisfied, the power supply, EZJ93 board, wire, or connector is abnormal.
Part Check method Criterion
Pump motor ①Operate the
pump on the
“Solenoid
Valve/Pump Test”
screen.
②Measure the
voltage at pin
No.5 (wire: red)
20 V DC or more
Solenoid valve ①Replace the
solenoid valve and
the connector with
another normal
solenoid valve and
connector.
②Make a check on
the “Solenoid
Valve/Pump Test”
screen. Release
the solenoid valve.
An operation sound can be
confirmed.
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