The reason why the water meter of Hebei Yuanjiang Instrument Technology Co., Ltd. does not display is difficult to give a specific answer because of the lack of relevant background information. However, the following are some common reasons that may cause the water meter not to display:

1. power supply problem: the water meter may have no power supply or the battery is low. Check whether the power supply is connected and whether the battery needs to be replaced.

2. Fault or damage: There may be a fault or damage inside the water meter, resulting in the display screen not being displayed normally. This may require professional technicians to repair or replace the water meter.

3. Environmental impact: The water meter may be affected by environmental conditions and cannot work normally. For example, if the water meter is affected by extreme temperature or humidity, it may affect its normal operation.

4. Communication problem: There may be a communication problem between the water meter and the data transmission equipment, which makes it impossible to display data. This may require checking whether the communication line or network connection is normal.

It should be emphasized that the above are just some common reasons, and the specific situation needs specific analysis. If you encounter a water meter display problem, it is recommended that you contact relevant professionals or company customer service personnel to get an accurate solution.