I have a light flashing on the top of my cordless Uniden Phone, Model DECT 6.0. I cannot get it go off and I have no clue why it is flashing.

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When you receive a new voice mail message, the new message LED on the top of the handset flashes and appears in the handset display. In the event your message waiting light gets out of sync with your phone company’s voice messaging system, you can manually reset it back to the “No messages waiting” state.

Steps:

Press and hold FiND on the base for five seconds.
Note: The handsets connected to the base will start to beep, however, keep pressing for five seconds. A beep sounds and the message alert tone is reset.

Below is a link to the manual:

Uniden DECT 6.0 Manual

Hi, my name is Mian-Wisal. Welcome to Expert Help. I understand how you feel. That sounds frustrating. Hopefully, we can get this resolved quickly. 

Light blinking is a voice mail indicator, for resetting please follow the steps.

Press and hold FiND on the base for five seconds. The handsets connected to the base will start to beep, however, keep pressing for five seconds. A beep sounds and the message alert tone is reset.

Mian-Wisa thisw is my question get off.

 When there are messages waiting in your voice mailbox, the new message LED on the handset flashes, and appears in the handset display. Have you checked for new messages? This might be the reason why the light flashes again.

Try to unplug the AC cord from the base unit wait 20 seconds, insert the plug again and THEN press the FIND HS button.

The blinking red light should stop.

 Press and hold the “Find” button on the base for 5 seconds. The base will begin beeping. Continue depressing the button for the full 5 seconds. Release after 5 seconds have elapsed. The flashing LED should be off.

Blinking red light indicates that you have to check your voicemail message.

The light should have cleared when you have.

Sometimes it doesn’t and sometimes the light is on permanently even when you don’t have voicemail. 

Did you try resetting the Voice message indicator light?

With the phone in standby, open the menu and select Global Setup; select VMWI Reset, then select Yes.

Here’s a link to the user guide, scroll to p.13 to view the information regarding Voice message notifications

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Perhaps the phone itself is bad and please take it back and get a new one

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What si the model number of your phone?  May I have it please?

Also, if you take the battery cover off most Uniden cordless handsets, the model of the system will also be there - on a sticker - usually UNDER the battery

For MANY Uniden systems, a "flashing light" on the system components usually means that there is a "New Message" waiting on either

a built-in Answering system - OR -

the provider's "Voicemail" system.

NOTE: the built-in Answering system and provider's voicemail system are two DIFFERENT and SEPARATE systems - that do NOT work well together.

So if you take a look at the handset display(s), you MAY see some text or ICON (symbol) that will indicate that there is a new message to be heard.

And IF the base unit has its own answering system turned ON and a new message is waiting, there should be a "message counter" that is lit up, indicating how many new messages have been left on that system.

I look forward to any further questions or results that you may have

OK - I have attached an image of the cordless handset(s) for this system - with the parts of the handset(s) labeled. Click the link below to see that attachment, then let me know if the "Status LED" is blinking - OR - some OTHER part of the system.

according to my notes, that status LED should be on when the handset(s) are CHARGING, and may turn off once the battery inside the handset is fully charged (or the handset is NOT on the charger).

So considering that this system is a few years old, if the batteries have NOT been replaced with new rechargeable batteries in the last year or so, I would recommend that ALL of the batteries be replaced, and then charged up for a few hours or overnight.

Please let me know if you have any more questions about this or similar issues in the future