Hi,
Do not know your particular model but reading through the manual was wondering if this was the indication that the Ready Tone signal was OFF.
This is from the manual:
''TURNING OFF READY TONE
Your coffeemaker features a Ready Tone that beeps 5 times when coffee is finished brewing. To turn this alert off, press Tone button; an icon will appear in display to indicate tone is off. To turn tone back on, press Tone button again; icon will disappear.''