The first thing I would try is a hard reset, which is just unplugging it for a couple of minutes, plugging it back in, and trying again.
If it still fails, you probably have a failed membrane keypad.
If you have lost your owner's manual, y
ou can
download your Panasonic owner's manual here.
If you're not in the US, see Panasonic.net.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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