Handset cannot synchronise with base - Panasonic KXTG1311 Cordless Phone

Interference from other mechanical devices can cause your phone to have problems. It can be that your phone is not in range - too far away from base.

If you want to replace a handset or re-assign the designated handset number of a registered handset, you must de-register all the handsets and then individually register each handset.
To de-register all handsets:
Press and hold
FIND HANDSET
on the telephone base for about 10
seconds (until the IN USE light on the telephone base turns on and starts to flash), then release FIND HANDSET
.
Press and release
FIND HANDSET again. (You must press FIND HANDSET
while the IN USE light is still flashing. The IN USE light flashes for
approximately seven seconds.)
All system handsets show
CONNECTING...
The de-registration process
takes about 10 seconds to complete. All handsets show
NOT REGISTERED
when the de-registration completes.
If de-registration fails, you might need to reset the telephone and try again.
To reset:
Pick up the registered handset and then press
/FLASH
.
Press
OFF/CLEAR
and place the handset back in the telephone base.
-OR-
Unplug the power from the telephone base, then plug it back in.
note:
You cannot de-register a handset if any system handset is in use.

After de-registering, proceed with registering process:
If the handset screen does not show LOW BATTERY
or HANDSET X, you will need to charge the handset for at least five minutes before registering to the telephone base.
To register a handset:
Place the unregistered handset in the telephone base or charger. If
PRESS FIND HS 4 SEC ON BASE
does not appear on the handset screen after a few seconds, remove the handset and place it in the telephone base or charger again.
On the telephone base, press and hold
FIND HANDSET
for about four seconds (until the red IN USE light on the telephone base turns on) and then release the button. The handset shows
PLEASE WAIT...
and it takes about 10 seconds to complete the registration. The handset shows
HANDSET X REGISTERED
(X represents the handset number assigned)
and you hear a beep when the registration completes.

Hi. If the batteries were flat for a length of time or when you changed them there were no batteries in handset for longer than a few minutes the handset might need re synchronising to the box.this process if required will be in the manual.

I suppose you put the handset back on the base unit so that they synchronise first.

Hello
Just unplug the base unit from AC wall power socket for a while, say for about 5 minutes or so, replugh the base unit to power socket again. Place each handset on it and synchronise it with the base unit. As you put it on, you will hear a beep sound. Now the ahndset ahs been synchronised with base unit. Do this for the other two handsets. OK.

It sounds like you have a defect in the main base, I suggest returning the item because you have gone as far you can go short of taking it apart.

Put the handset into the base when it's plugged in, the light on the phone should blink and connect.

As for the unplugging part, buy yourself either a surge protector (and a relatively good one, not a cheapie version) or a small UPS (a.k.a. a battery backup unit) that will protect your phone from electrical damage from storms.

If “No link to base. Move closer to base, try again.” is displayed
even when using the handset near the base unit, the handset may have lost communication with the base unit. You need to re-register the handset to the base unit.
• Make sure the base unit is not being used.
• Have both handsets and base unit nearby during registration.
• Follow steps 1–3 listed below. You have about 1 minute to complete them.
• Confirm the extension number of the handset which has lost the communication by placing the handset on the base unit or charger.
If you re-register the handset using the other handset’s extension number, the other handset will not function.
• If the handset beeps 3 times and “Error!!” is displayed, an error occurred. Try again from step 1.
• You can stop registration by pressing [OFF] on the handset, and pressing [LOCATOR/INTERCOM] on the base unit.

1 Base unit: Press and hold [LOCATOR/INTERCOM] until a beep sounds.
• The CHARGE indicator flashes.

2 Base unit: Press the extension number [1] (handset symbol 1 ) or [2] (handset symbol 2) of the
handset which has lost the communication.

3 Handset: Press and hold [FLASH/CALL WAIT] until “Handset Registering” is displayed.
• When registration is complete, a beep sounds from the handset and the display shows the number.
• Wait for 20 seconds after registration is complete while the handset establishes communication with the base unit.


• If the handset beeps 3 times and “Error!!” is displayed, an error occurred. Try again from step 1.
• You can stop registration by pressing [OFF] on the handset, and pressing [LOCATOR/INTERCOM] on the base unit.

The handset/base keeps a record of who it’s registered to. The base also keeps a record of how many handsets are registered to it.

Using the de-register function on the handset deletes the handset from the base (decrements the count) and deletes the base info from the handset. All this requires that the base and handset can communicate with each other.

To remove the base data from a handset when out of range of the base, press and hold the ‘end’ button and the ‘#’ button simultaneously until the phone beeps. It will now be de-registered from the base.

However, the base will still have this handset in it’s record.

To de-register all handsets from the base, remove power and the base handset. Press and hold the ‘flash/find hs’ button while applying power. Wait for the beep and release the button. The charge light will now flash. Sit any handset in the cradle. When the flashing stops, all handsets are inhibited from connecting.

However, the handset still appears to be connected to the base unit. Pressing talk will give an ‘Unable to connect’ message. To re-register the handsets to the base, you have to de-register the handset first with the two button method.

Of interest, pressing ‘*’ and ‘#’ on the handset while reconnecting the battery is suppose to reset the handset. Doing the same on the base unit puts you in some sort of diagnostic mode. Press speaker to exit.