What if the security doorbell is broken?
If the anti-theft doorbell does not ring, the fault may come from any part of the circuit - button, doorbell or transformer. The transformer is an electrical component that steps down 110-120 volts to the bell's operating voltage of 10 to 18 volts. With the exception of transformers, all parts of the doorbell circuit can be safely operated without disconnecting the power supply. If you do not know which part of the circuit has failed, you need to prepare the following tools to use when servicing the doorbell:
Doorbell Repair Tools
1, screwdriver
2, spare button, doorbell or transformer
3, 12 volt multimeter
4, 110-120 volt multimeter or continuity detector
5, wiring nut or crimp connection
Doorbell repair steps
Step 1: Remove the screws that secure the doorbell button to the house.
Step 2: Pull the button out to the allowable length of the circuit cable, then release the fixing screw on the button to disconnect the wire. Connect the two bare ends together. If the doorbell can ring, you can know that the fault is in the button. Install the new button by attaching the two wires to the fixing screws of the new button, and then reinstall the button on the house. The doorbell button is a single-pole switch (two wires are connected), and you can place the wires under their respective screws.
Step 3: If the doorbell does not ring after the two bare ends are connected together, the fault may be elsewhere - doorbell assembly, wiring or transformer. Remove the bayonet cover of the door bell. Removal may be more difficult than expected. Because there are several different types of covers, it may be necessary to try several steps. Try to lift the cover slightly upwards and pull it out; if it doesn't work, pull the cover straight out without first lifting the cover or looking at the bayonet Whether the cover is fixed in the doorbell assembly by pins. If it is, press the pin and pull the cover to loosen it. No matter what operation is performed, do not use excessive force to avoid damage to the beautiful cover plate.
Step 4: After removing the cover, look for two, three, or more terminals and wires, depending on how many tones your doorbell system rings. A standard doorbell or buzzer has two wires that can be disconnected by loosening the fixing screws and then connecting the wires to a 12 volt multimeter or by attaching the wire to the retaining door bell fixing screws. Cheap doorbells, buzzers, or 12-volt automotive bulbs (with sockets and two wires) can be used for testing. If you test the doorbell, buzzer, or light when the doorbell button is pressed, you must install a new doorbell.
Step 5: If the doorbell assembly has three or more wires, mark them with masking tape: 'T' for the transformer, '2' for the front doorbell, and '1' for the rear doorbell. Loosen the set screw, remove all wires, and connect the wires labeled 'T' and '2' to the screw terminals on the test doorbell or light bulb. If the test doorbell rings or the light bulb lights up when the front door button is pressed, the old doorbell device is faulty. To test this conclusion, connect the wires labeled 'T' and '1' to the screw terminals on the test doorbell. If the doorbell rings when the rear door button is pressed, it is determined that the doorbell must be replaced.
Note: If your doorbell malfunctions, the fault may be in any part of the circuit, including buttons, bells, and transformers. Before removing any wires from the terminal strip, it is best to mark them so that they can be properly put back into place.
Step 6: If the doorbell does not ring or the light bulb on the button or doorbell does not light, then both are normal. Through the elimination method, you can now know that the fault must be on the transformer or wiring. It is usually found that the transformer is installed on the junction box, the sub-distribution board or the main access switchboard, and the door bell wire is connected to the fixing screw exposed on the transformer. Connect the test doorbell directly to the exposed low voltage transformer terminal. Do not touch any other screws. If the doorbell does not ring, the transformer is faulty or not powered.
Warning: The transformer is connected directly to the power supply and the current it carries may cause injury. Before operating the transformer, disconnect the branch circuit that supplies the transformer. Remove the appropriate fuse or trip the appropriate circuit breaker, or operate the main switch to disconnect the home from the mains.
Security Doorbell Repair
There are many reasons that cause the doorbell to stop working, including button failures and circuit damage.
Step 7: Before replacing the transformer, check to make sure that the power supply circuit voltage is 110-120 volts. Power off the circuit and disconnect the transformer from the line wires. Then turn on the circuit again and use a 110-120 volt multimeter probe to make contact with the bare wire end. If the multimeter indicator lights or the indicator reads 110-120 volts, the circuit is normal.
Step 8: If the transformer fails, disconnect the circuit and remove the transformer. Buy spare transformers with the same voltage and power. You can find the printed electrical information on the transformer, and you should find the installation instructions on the package. Follow the instructions carefully. Use a crimp connector or wire nut to connect the new transformer to the circuit wires of the electrical system, then connect the doorbell wire to the low voltage screw terminal of the transformer, turn the power back on, and then press the doorbell button. If you have installed the transformer correctly, you should be able to hear the doorbell ring.
Step 9: If it is verified that both the transformer and its power circuits work properly, it is only possible that the connection to the doorbell wiring is disconnected or loose. Check the circuit along the doorbell circuit from the transformer to the doorbell to the button to find out if there are loose fixing screws or wire connectors. If this method cannot be successfully verified, you must use a continuity tester to check each section of the circuit.
Step 10: To test each segment of the circuit, disconnect the door bell wire from the transformer to disconnect the bell circuit. Do not use the continuity tester for powered circuits. Disconnect the transformer wires from the doorbell and twist them together so that they touch each other. Return to the transformer and make the probe lead of the continuity tester contact with the exposed end of the doorbell wire. If the tester lights up or there is a reading on the meter dial, the circuit is continuous and there is no interruption or loose connection in the circuit. This part of the circuit is completely normal. If the tester does not indicate it, it means there may have been a break. If there is no problem with this line, continue testing the next line and check it in the same way.
Step 11: If there is an open circuit in the circuit, you must try to find its location and repair it. However, sometimes, in the case of a large number of doorbell circuit wiring hidden in the wall or inconvenient operation, the simplest operation is to abandon the original wiring line and lay a new doorbell wiring line along the most convenient path.
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