Crystal CHP075PX, User Manual, Page: 22 / 51

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7.2.8 Error code
Select and press to check the error code. If the HP is normal, button is invalid.
For example,
7.2.9 Time setting/Timer setting
Select and press to enter, press again to Timer on/Timer offsetting.
Press to enter and and to select Timer on or Timer off.
Press to select on/off and press or to set the time. Press to save the
setting.