I found that my Vtech 5825 phone was dead one morning. I tried charging it but it wouldn't charge. I put new batteries in it and the screen had "Not Registered" on it. It wouldn't do anything and it still wouldn't charge.
I tried taking the batteries out and unplugging the base from the electricity and phone line for a few minutes. No change. The second handset still works.
I couldn't find anything about this problem on Vtech's web site and I couldn't find an option to talk to anyone when I called the customer support number.
Anyone know how to re-register this phone?
I had the same problem and I JUST fixed it! First, unplug the power to the main base (answering machine) for 20 seconds. Plus it back in. Put the phone that says "not registered" in the main answering machine. It will say "press the find handset for 4 seconds". Do that. It will run thru a series of stuff and will find the handset. It works!
This worked for the 7100, hopefully it works for other models:
When the handset says "not registered", it should still have a "menu" option. Select that, then the only choice is "register", select Ok. Now it says "searching for base", press and *hold down* the "locate handset" button on the base until the handset beeps and wakes up. Docs say this could take up to 30 seconds (it was about 17 for mine).
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1Remove the battery cover from the back of the phone. Most models have a door that slides downward to reveal the battery compartment.
Install the battery by inserting the connector on the battery wires over the pins in the handset battery compartment. The connector will only go on one way.
Insert the battery pack into the compartment and replace the battery cover.
Charge the phone by sitting it in the charger for a minimum of 16 hours on the first charge.
Place the fully-charged phone onto the cradle of the base unit and wait for the display to show "PRESS FIND HNDST 4 SEC ON BASE." If the message does not come up, lift the phone off the base and put it back in the cradle.
Press and hold the "FIND HANDSET" button on the base unit for approximately four seconds. The display on the phone will change to "PLEASE WAIT," then "HANDSET X REGISTERED."
You are pretty close to the solution. The problem is the charge detection in the handset. All handsets on a cordless phone detect the battery level with an hexadecimal value in the memory. Each hex value equal a volt value of the battery. EX: 3.5v = 9B 3.6v = 9C 3.7v =9D etc... The problem is the hex value in your defective handset are all mess up. So 9B is not 3.5v anymore. Then your handset could last 1hr after foul charge or doesn't alert you before the phone goes dead due to low BAtt.
I had the same problem and this procedure fixes it! First, unplug the power to the main base (answering machine) for 20 seconds. Plus it back in. Put the phone that says "not registered" in the main answering machine. It will say "press the find handset for 4 seconds". Do that. It will run thru a series of stuff and will find the handset. It works!