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Chapter 6. Details of Functions via Communication
Clearing events
You can clear the event flag (3044W) for an event that occurred with any of the
following three operations:
• Clearing events through communication
• Holding down the RESET switch or shorting the contact reset input
• Turning the power on
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Clearing events by communication
To clear an event through communication, write the data in the following table to
3555W using the WD or WU command.
Item name Address Description of event Data to write
Event Clear 3555W UV flame detector check (combustion time) (A1)* CA51H
Product service life check (total operating time) (A2) CA52H
Product service life check (total combustion count) (A3) CA53H
False flame (A4) CA54H
Flame relay OFF (A5) CA55H
Flame relay OFF (shutter closed) (A6) CA56H
Clear all events CAFFH
*If event A1 has occurred, reset the combustion time (3389W/3390W) to zero at the same time.
For example, writing “CA51H” to 3555W clears UV flame detector check
(combustion time) (A1).
If there are other events at the same time, they are not cleared.
Write “CAFFH” to clear all the events at once.
Handling Precautions
• When you clear all the events at once, the 7-segment display changes to the
operating status code display mode.
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Clearing events with the RESET switch or contact reset input
When you press the RESET switch for 3 seconds or more or short the contact reset
input for 3 seconds or more while the event code is displayed, all the events are
cleared at once.
If event A1 has occurred, clear the combustion time (3389W/3390W) to zero at the
same time.
Handling Precautions
• When an event is cleared with this operation, the 7-segment display changes
to the operating status code display mode.
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Clearing events by turning the power on
All events are cleared when the power is turned on.
However, the combustion time (3389W/3390W) is not cleared to zero.
If a predetermined condition is met after you clear events, the corresponding event
occurs.
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