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3-5 Replacement of PCB
Procedure
CAUTION
1.
Unplug power supply cable.
2. Remove the PCB.
(See “Removing PCB” in page 38)
3.
Remove the Memory PCB from the
Memory PCB connector.
4.
The Memory PCB in step 3 should be
attached on the Memory PCB connector
of the new PCB.
5.
Replace the new PCB and insert the
each connector to the new PCB.
6.
Plug power supply cable.
7.
Run water to the unit and check the
normal combustion. Then, adjust the
Gas. secondary pressure.
The new PCB does not have the Memory PCB.
The Memory PCB has the life-record of Neutralizer.
The Memory PCB mounted on the original PCB should be moved to the new PCB.
If not, the error code “732” (Memory PCB unattached) is displayed on the remote controller
and the unit cannot be operated.
In case that hot water is not supplied and
the error code “732” (Memory PCB
unattached) is displayed, check that the
Memory PCB is attached correctly. Then,
unplug power supply cable and plug it
again.
Note:
-Make sure to unplug power supply cable when the Memory PCB is removed from the
PCB and is attached on the PCB. It can cause the damage of the data in the Memory
PCB.
-The data for setting of the unit is stored in the Memory PCB. Be careful to keep it from
being affected by humidity, impact or static electricity.
ON
5
7
6
1
4
2
1
2
8
3
OFF
ON
OFF
PCB
2
11
3
4
6
1
10
8
9
5
7
Memory PCB
connector
New PCB
Attachment
Removed
Memory PCB