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
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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