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Door bell rings by itself then hums.

My wired doorbell will ring occasionally by itself. Then the electronic part will hum continuously. Do I just need to replace the entire unit? It's old. Is there a trick to doing this?

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Steve Amerson, check your door bell switches that are on your door :) see if those have loose contacts. If you want to change your doorbell, it would be a straight forward exchange, but the symptoms you describe are more that of loose contacts.

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try removing the switch and connecting the wires to get it to ring.

depending on the age of the unit i will assume there is 1 ring per press. if so then that might be your problem cause the short in the switch is cousin it to ring randomly and hum when it is still giving it a complete circuit (act as if the button is being held down) at all times.

answer for this will be a simple replacement of the switch.

if its a modern day door bell then it might be the actual unit itself. if it is please share with more info.

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Steve Amerson will be eternally grateful.
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