Hitachi H Series Instruction Manual page 137

Notes)
*1 Reset: Reset can be made by power OFF – ON or by ON of the reset switch.
*2 ON of the error LED indicates a serious fault.
*3 Error indication is made on occurrence of an error, even if the error is what makes
reset automatically, and it is held until the error indication clear switch is ON or
reset is made.
*4 In the case where multiple errors occur, storage is made in the occurred
sequence. Therefore, the error which occurred the last is indicated by the error
indication select switch.
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