The keypad may be faulty or a button may be stuck.
Follow these steps to identify the problem:
- Run the keypad diagnostics by holding down Time +/- and Level +/- at the same time.
- When D3 (Keypad test) is displayed, press Enter to start the test. (On older black models the test begins automatically.)
- Press each button on the keypad and you should hear a beep. If a button does not beep, the key may be stuck or the membrane could have been damaged and will need to be replaced.
- To exit the Keypad test, press Pause Clear two times.