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DOOR BELL REPAIR AND TROUBLE SHOOTING


Most door bell problems are the result of a bad door bell button.
If you suspect a bad door bell button
1) Remove screws.

2) Pull button out.

3) Remove wire from button.

4) Then put wires together.

Bell should ring or chime if button is good. (Donít worry; the average home doorbell system is only 24-volt max. However use tool or rubber glove in case of a very rare case of foul wiring.

You can also use an alligator clip or a piece of wire to jump circuit. This is the same as putting the two wires together.

If you put the two wires together and bell does not ring or chime, itís time to do some looking around.
Next, check the circuit breaker or fuse box. See if fuse or breakers are off or fuse blown.
Usually if a breaker or fuse is blown, there should be some other circuit in the home not functioning.
Circuit breaker feeds a transformer that supplies 16 to 24 volts to one side of the bell button. When you push the button , the current will go through the button and on to the bell.

A transformer is a device that changes the voltage. In the case of a bell circuit, a 120 volt, ( normal house voltage,) goes in and 16 to 24 volt come out.

Next use good visual inspection, check transform, bell and /or chime for loose or broken wires, locate transformer and bell. If you donít find any thing wrong by way of visual inspection then its time to check for voltage at the transformer.


LOCATING TRANSFORMER AND WIRE


Many of the new homes may have transformer mounted right on the fuse box.
Other may be located on a basements ceiling beam.
Locate transformer and give wire visual inspection.
Transformers are usually mounted on an electrical junction box. These junction box have 120 volts wires in them, (wires on the primary (input) side of transformer.) one should cut of breakers, open junction box, and then turn power back on to test circuit.


Testing transformer and bell circuit

To test transformer and circuit you need use a circuit tester.
Remember that there are two voltages on a transformer, ( the 120 volt input and the 16 or 24 volt output.)
This means that you have high and low voltages.
While some voltage testers will test a wide range of voltage, a small volt / ohm meter, is more flexible.
To test transformer and circuit;
Put the tester or testing lead on the set screws or smaller wires on the transformer. Voltage should read 16 to 24 volt
If there is voltage, and the two bell wires are together, the problem may be in the bell. However if you are sure that there is 120 volt feeding the transformer, and there is no voltage on the low voltage side of the transformer, the transformer should be bad.

Next check continuity with ohm meter.
1) check transformer; if winding are open, meter will not read ohms.
2) Next, test wires back to bell and button. (Disconnect transformer wires, read continuity back to bell or chime, with button jumped out.)
3) If bell is no good there should be no ohm reading on meter.

 



 

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door bell circuit

 Door bell circuit

 

 

 

 

 

 

 

Circuit showing jumper

Circuit showing jumper

 

 

 

 

 

 

 

 

 

 

 

 

 

Transformer

Transformer

 

 

 

 

 

 

 

 

Transformer on electrical box

Transformer on electrical box

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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