Question about AT&T 5840 5.8GHz Speakerphone/Answering/Caller ID Answering Machine

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ATT 5840 answering machine

Had a power outage last week and now nothing about the answering machine will work.  It clicks and flashes the numbers "88" every second.  I tried to reset and even disconnected from the wall.

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  • Anonymous Nov 28, 2007

    Answering machine inadvertently unplugged,(no manual) have no idea how to reset answering machine to include number of rings b/4 answering maching picks up.

  • Anonymous Mar 04, 2008

    will not answer...it says the machine is unable to...what do you do?

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  • 47 Answers

You need to reset the cordless phone. This sounds like a lightning strike , if it was the phone is finished. Unplug it , wait 20 seconds and plug it back in again.

Posted on May 11, 2008

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Posted on Jan 02, 2017

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As machine window flashing 88 and clicking


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Our telephone and answering machine quit working after a power outage. Pushed reset button but nothing changed. The letter E is in the window of the base unit. When unplugged the power supply and...


it sounds like the unit has taken a surge, which is a common side effect of power outages. unplugging and replugging make fix the issue but since you have already tried this, i would reccomend contacting the manufacturer. See if a replacement can be given or if you have warranty on the unit.

The E is most likly a refrence to general error. the main board for teh unit was probably damaged by the power outage.

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The processor chip that records the voice is a multi level SMD technology chip. The tech who changes it will need the proper soldering facilities for this type of work.

The only people who can service the phone are the authorized service people for ATT. They will not sell parts to non authorized service people, even if they have the proper facilities to change the chip.

For service on your phone, the service center will normaly change the complete circuit board. If the phone is out of warranty, the cost would not be worth it.


Jerry G.

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1 Answer

As machine window flashing 88 and clicking


I have same problem how do i fix this

Nov 05, 2007 | AT&T 5840 5.8GHz...

1 Answer

Power outage last night. Deleted all saved voicemail messages. when turned on - machine says "no massages" How do I retrieve lost messages?


I'm sorry there isn't. Answering machines like this have very little ROM memory. After a powersurge and outage like last night, it wiped the whole memory chip. You can try there support page. It's actually pretty good. http://telephones.att.com/telephones_ui/support/index.cfm

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