Eclipse - Fujitsu Ten CH3083 EN - Manual (Page 61)

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If you have a question:
First check the items mentioned below before attempting to
troubleshoot problems.
If a problem occurs, for instance when the unit does not respond
to any button presses, or the display doesn't work correctly,
press the [RESET] button using a sharp tool.
Pressing the [RESET] button will delete all the entries from
memory. The settings will return to those made at the factory
prior to shipment.
Caution
If you have a question:
[RESET] button