ALPHA ed-Lock Plus numeric keypad stopped responding

"The numeric keypad stopped responding after replacing the battery"

Symptoms of the numeric keypad becoming unresponsive are common with "ed-Lock". Due to the board defect, it is necessary to replace the entire unit. What about this time?

When I arrived at the scene, it was "ed-Lock Plus". It seems that the client himself replaced the battery, but after that the numeric keypad stopped responding. The battery cover will not come off easily.

He has inquired with the real estate agent's locksmith, but was told that he may have made a poor contact or forced the installation.

When I removed the battery cover by unlocking the bypass, all the polarities of the AA batteries were reversed. It's the first time I've set everything cleanly in the opposite direction. I found that some people set it like this even though the polarity is indicated.

Even if the polarity is reversed, the battery holder can be set in the main unit (although it is a little hard). This is also a design issue. Re-set to the correct polarity and you're done.