My vtech phone base keeps flashing line in use but there is no handset in use

Here are the steps: Press menu, then press *883247# and then press the up arrow. Select deregister and then unplug and take the battery out for 10 seconds. Plug the phone back in and it's ready to be registered to another device.

Disconnect everything from power and remove batteries, this should reset everything back.

I had this happen suddenly on 2 out of 3 handsets with a DS6151 base and DS6101 handsets. Well, what happened is there was no dial tone on either of the 2 handsets on either of the 2 lines and a message appeared on the display "Unable to Call Try Again" after some delay, if Line1 or Line2 button was pressed.

Oddly, the 2 that did not work were the ones normally on "extension" chargers and the 1 that did work was the one on the base unit. That caused me to suspect the base unit .. which it still may have been but the solution was NOT. And, also odd, the handsets seemed to still be synched with the base unit in many respects.

Cycling the power on the base unit did nothing.
These are fairly new units and battery life is generally much longer in my experience.

The Solution:
- Remove the battery from the handset that doesn't work properly.
- Re-install the same battery.
Whatever was wrong, this reset it and the handsets started working again.
Easy fix.

I have a 2-handset VTech CS6419 that I had been using w/o problems for months. Both HS were always plugged in and charged. One day I found the base HS would not ring and the screen had the message that I needed to register the HS. Pressing the "find HS" button to start the process only made the accessory HS, not the malfunctioning base one, ring. I solved the problem by 1) unplugging the base, 2) pulling the batteries from BOTH handsets, then 3) replugging in the base and reattaching the battery for ONLY the malfunctioning HS. 4) I then did the registration process again (press the "Find HS" button on the base for 4 seconds, then press the # button on the HS and wait.) The malfunctioning HS then registered! I then reattached the battery to the accessory HS and returned it to its' base. Problem solved!

parallel i believe refers to the ability to use multiple handsets on one line and one call. This phone has the ability to isolate a telephone call so that only the original answering handset can tune into the conversation. If you only have one of these models then this setting has no real function.

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remove battery for handset.
unplug power AND phone line to base unit.
wait 15 seconds or more.
reinstall battery.
plug in power to base.
plug in phone line to base.

put handset in base charger slot.

wait a minute or more for all to reload from ROM.

If the other three handsets work ok then you have a defective handset.

I found a solution that fixed this problem (at least for me). On the vtech site they said to unplug the base unit for at least 5 minutes. Previously, I had only unplugged the base unit for a few seconds. This time, I left it unplugged for about 10 minutes or so and when I plugged it back in, everything was working fine. Apparently there is some sort of capacitor that must discharge long enough to completely remove power from the circuitry.

Good luck and I hope this works for you!

You need to de-register the broken handset then add (register) the new handset:

http://www.vtechphones.com/vtechui/support/dsp_product_faq.cfm?product_faqID=20854

I can vouch for the second solution. It worked perfectly on my 2461 with two extensions. Even the vTech website was not able to provide a solution.