Why when I switch on the DataMate, it displays a message: “Key is down.” and will no longer operate?

There are two possibilities.

1. There may be a partial vacuum in the box due to air shipment. The vacuum is sucking on the keypad and causes the “key down” error message. In this case, unscrew the two screws at the bottom of the box and wiggle the box a bit. This should allow air to flow into the box and release the keypad.
2. The keypad may be too large for the panel. In 2004, we received a batch of keypads that were slightly too large. They fit the panel well enough during assembly, but later expanded. The result was this same “key down” error. In this case, please contact your distributor. He may be able to replace the keypad or will send the box to us for repair.