How to Repair a Door Chime

If your door chime no longer provides the familiar tones and merely hums or buzzes, you can probably fix it without too much trouble. Try this before replacing it.

Steps

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Many times this cover will just hang on some tabs and can be removed by lifting it straight up. Other types may require that screws be loosened or removed.
Reinstall if possible. Springs and plungers are basically the only moving parts for electro-mechanical chime units.
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Most units operate at 24 volts or less, and should not pose a shock hazard. You can determine this by looking at the wires. If the wires look to be closer in size to telephone wire - or low voltage thermostat wire, it is most likely the 24 volt (or less) type. Low voltage doorbell circuits usually originate at a small 120 volt to 24 volt (may be any value between 12 and 24 volts) transformer connected to the side of electrical panel. The presence of a transformer is also a good indication, too. In any case, treating the wiring as if it was line voltage (120 volts) will help prevent getting hurt.
A faint buzzing sound or slight movement confirms that the chime unit is getting powered.
Check and tighten the electrical points (fuses and circuit breakers, terminal screws of the doorbell button(s), and transformer) if unable to hear or see the indications above and try again. If still unable to hear or see the indications above, just continue following the steps below.
Gently push / pull the plunger(s). It may move only in one direction, but may move in both. If unable to move the plunger, or it moves but does not "spring back" into position, it is likely hanging up on dirt, dust, etc.
Do not use any kind of lubricant. No oil, no WD-40, no graphite powder, and no silicon spray. These may work for a short time, but will quickly attract dust and grime and gum up the plungers.
Either way will require safeguarding the area from dirt, solvents, etc. If removing from wall, label the wires and terminals before disconnecting.
Do not be surprised to see dirty contact cleaner dripping out of the mechanism. Attempt to move the plunger again. Continue to spray bursts while moving the plunger. The idea is to flush out any dirt, etc that has collected around the metal plunger body.
Once the plunger is able to move freely, the chime unit is ready to be reconnected and tested by pressing the doorbell button.
These values must match. Replace either the chime or transformer so that the two have matching voltage values. Most doorbell transformers are marked with AC voltage, but also have a 25 VA (watts) rating -- do not confuse VA with AC volts.
If chime works, replace doorbell buttons.

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Question
After the doorbell is pressed, the chime goes continuously. What could be the problem?
Community Answer
It might be that the button is getting stuck in the pushed-in position, making the chimes continuously sound. Try taking apart the button and greasing it to keep it from sticking.
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Question
My doorbell developed a constant buzz. What would cause this?
Community Answer
The transformer is going out. It will need to be replaced. Compare the price of changing it with the price of replacing the whole chime.
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Tips

1. Be sure to set your voltage meter or multimeter to AC.
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If you set it to DC by mistake it will not read properly
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Set the range to 50 or 100 volts AC
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Warnings

Do NOT lubricate the plunger. Lubricants attract and hold dust and dirt. This will cause the plunger to fail prematurely.
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