We have an older model Nutone door bell (mid '70s). It gradually quit chiming. The transformer works. When a door bell is engaged the wall unit buzzes for 3-4 seconds and than stops. We do not have an instruction manual. There is a name plate that says to unstick a plunger remove bell bar, There are 3 bell bars. Each is held by two metal rods that must be attached somehow out of sight. They turn but do not release. We have tried several approaches but cannot remove any bell bar. How dd you remove a bell bar? The mechanical unit has the number LA49F79. The wooden exterior cover has the number A67278. The interior circuit board suggests that this is a clock model.

IF you are going all elec,you need a door bell,bell transformer and of course the push button. This is all low voltage so phone wire will work.You are just using 1 pair of wires so pick a pair such as the blue pair.Wire from push button to transformer to door bell.It is not polarity senstive....simple to do

The unit is receiving electricity so low-voltage transformer and button are working correctly.
Only suspect left is door chime itself.
Check that voltage of transformer matches voltage of chime.
Use cheap multimeter from home center and check voltage at chime, or check transformer.
Doorbell transformers are usually located in basement or garage or attic, and most are hardwired into octagon box.
There are no replacement parts for door chimes.
Buy new one, or contact seller for refund if this is new chime.

This unit has 2 transformers for power. It sounds like 1 of your trans. is dead. Check the voltage on each one.

I couldn't find a manual for the LR2982, so I'll give a general description of how to wire a door chime. Most chimes have 3 contacts. F (Front), R (Rear) and C (Common). Some have just two contacts. If your chime has more than 3 contacts do _not_ follow these instructions.

Inside the junction box on the wall where the chime will be mounted, you should have at least 2 cables (usually brown) each, with at least two wires (usually red and white) each. One of those cables goes to the transformer and the other cable goes to the door button.

The beauty of it is that since it's only 24 volts or less and _polarity_ doesn't matter, you don't need to know which cable goes where for a _single_ door button scenario.

For _single_ door button wiring, pick a wire (say the red) from one cable (doesn't matter which cable) and connect it to the "C" contact on the chime. Pick a wire (say the red) from the _other_ cable and connect it to the "F" contact on the chime (if the chime has 3 contacts). If the chime only has 2 contacts connect it to the only contact that is left.

Then all one needs to do is twist the 2 remaining wires together (both white) and cap them off with a wire nut.

If your junction box for the chime has 3 cables in it, the extra cable goes to a rear door button. In that case you _do_ need to know which cable goes to the _transformer_. You can pick up a cheapo voltmeter for about $10 just about anywhere. The cable that reads anywhere from 16 to 24 volts AC between the red and the white wires is the cable that goes to the transformer.

Make sure one of those wires from the transformer goes to the "C" contact (pick one, say the red). Now you know the 2 remaining cables go to the front and rear door buttons. For now, just connect a red from one of the remaining cables to the "F" and one red from the other remaining cable to the "R". Then just twist the 3 remaining white wires (including the white wire from the transformer) together and cap them with a wire nut.

If the rear chime sounds when the front door button is pushed, just swap the wires on "F" with the "R"contacts..

Make sure you are applying the correct voltage to the primary windings. what is the voltage you are applying?

The 515N number is a transformer part number, do you have a photo of the chime you have? Is it wired or wireless? Is it a newer chime or and older model? Check Nutone's website to see what model you have, then search their site for the model you have. The model page will have an instruction sheet PDF file download of the instructions.

i think the third wire is probably ground(green). if that is the case, just connect white white, black black or black .red

If you cant fix it, just buy a new one, they are cheap $15.
Basically it's a magnetic coil that moves a metal bar that strikes a bell.
They run on 24 volts AC and are powered by a transformer. All parts are available at Lowes or Home Depot or even your local hardware store.

Loss of range between bell and presser