为什么我的231显示屏上写的是Er01或ER02 ?

The 231MS and 231RS with display options will both display this error if there is a problem within the circuit board or if there is a problem with the display itself. ER01 indicates the unit has lost its memory, in a sense. The unit will need to be sent back to he factory to be re-calibrated.

ER02 is also a memory loss error. With the ER02 error, the unit can be re-set by pressing the zero button.

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