I have a blyss 850 door chime the plug in unit is working but the remote battery unit is not.How do i synchronise them together?

If your Blyss doorbell won't stop ringing, there are a few steps you can try to troubleshoot the problem. Here are some possible solutions:

1. Check the wiring: The first thing to check is the wiring of your doorbell system. Make sure that all the wires are securely connected and that there are no loose or damaged wires. You can also try disconnecting the wires and then reconnecting them to see if that fixes the problem.
2. Check the chime: If the wiring is fine, the next thing to check is the chime. Make sure that the chime is properly installed and that it is not damaged or loose. You can also try removing the chime and then reinstalling it to see if that fixes the problem.
3. Check the bell push: If the chime is working properly, the next thing to check is the bell push. Make sure that the bell push is securely installed and that it is not damaged or loose. You can also try cleaning the terminals on the bell push to remove any dirt or debris that may be preventing it from working properly.
4. Check the transformer: If the bell push is working properly, the next thing to check is the transformer. The transformer is a device that supplies power to your doorbell system, and if it is not working properly, it can cause your doorbell to ring continuously. Make sure that the transformer is securely installed and that it is not damaged or loose. You can also try disconnecting the transformer and then reconnecting it to see if that fixes the problem.

If none of these steps help, you may need to contact Blyss customer support for further assistance. They will be able to provide more specific troubleshooting steps based on your particular doorbell model and setup.

Try this:

Reset the Unit

- remove all the batteries from the bell
- ensure the battery in the doorbell unit is working and remove the back cover
- replace the batteries in the bell unit
- within 30 seconds of the bell unit sounding the bell, press the melody changer button on the back of the door bell unit once
- remove all the batteries from the bell

Pair the Unit

- wait at least a minute after reset
- remove all the batteries from the bell
- replace the batteries in the bell unit
- within 30 seconds of the bell unit sounding the bell, press the door bell button

I couldn't find the manual instructions for your Blyss MP3 wireless door bell... I asked your question on the UK Amazon store that sells that unit, but who knows when or if anyone will answer it
Blyss Wirefree battery door bell with additional plug in bell

I found a similar manufacturer's MP3 wireless door bell.. you might find some idea from that if it might be similar or the same ??
http://www.deurbel-zaak.nl/Files/2/24000/24385/Attachments/Product/j0vB6W640153772PG8ZrR6gr9Xr1363i.pdf

Besides that, you have listed this question in the wrong category. The below linked section may have others that are more qualified that might be able to answer your question who are more familiar with your product:
Questions Answers for pair blyss wireless doorbell

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foocking useless website. moor like webshite

Try this trick, push the lock button once your in the car to unlock first then lock then unlock again, your kill switch is activated as anyone could unlock the door with a key, but to be linked together via bluetooth remote is exclusive and good practice if you choose to stop a thief

duplicate

The contacts in the outside push button unit may need cleaning. They do get dirty over time. If that doesn't solve your problem you can contact the Zenith Company, who is now is the manufacturer for tech service issues. 800-858-8501.

Hope this helps solve your problem.

Sounds like the contacts in the button are either dirty or have been bent a little. Try cleaning them and repositioning the contacts if necessary.

its all very simple, just plug in the receiver, and make sure the battery for the button is good.

From User Guide: Interference from a similar unit operating nearby: a) simply remove the batteries from the push button and door chime units and rest for 10 seconds, this will erase memory b) Insert the batteries into the push button and door chime units, the door chime unit will give 2-beeps to indicate that it is ready for the new registration code. Press the Push Button once, it will generate a new operation code randomly and send a wireless ignal to the door chime unit and it will sound to indicate that new operation code is registered and memorised.
(Note with this unit SX85R the door chime is mains powered, not battery powered, but above instructions are the same)