2. There are round covers on both sides of the meter, which is convenient for taking out the battery and plugging in the wire. Take out the battery, unplug it, replace it with a new battery, and then plug in the card to see if it can be read normally.
3. Unplug the battery if you don't understand it, and then try it on several times.
Extended data:
Matters needing attention in using IC card cold water meter:
1. After replacing the battery, the user must cover the moisture-proof cover and tighten the screws, otherwise the meter will not work, and E-5 will be displayed on the card.
2. Users need to regularly check the operation of smart water meters and pay attention to antifreeze in winter.
3. For users who have been installed in the pipeline but have not been delivered to use or have not used water for a long time (more than one week), please close the front and rear valves of the smart water meter, and the company will not bear the consequences.
4. If the electronic display of 4.ic card cold water meter is inconsistent with the word wheel or the intelligent water meter fails, the word wheel measurement shall prevail.
Baidu encyclopedia -IC card cold water meter