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Old 04-20-2010, 06:38 PM   #1
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Humming Transformer


This device/transformer is inside my furnace room and has an irritating hum. Does anyone know what it it and how to fix it? See attached picture.
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Old 04-20-2010, 07:12 PM   #2
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Humming Transformer


Looks like Doorbell transformers
Do you have an Alarm system ?

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Old 04-20-2010, 07:55 PM   #3
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Humming Transformer


There are three transformers shown in the picture. You may find that one is a little loose and tightening it up against the junction box reduces the hum. Or adding a screw to hold the junction box more tightly against the wall may reduce the hum.

There are other tricks, too, like remounting the transformer so a piece of sheet rubber between it and the J-box damps out some of the hum. Do not wrap the transformer; it could overheat as a result.

Pressing your finger here and there may help figure out which transformer is making the most noise.
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Last edited by AllanJ; 04-20-2010 at 08:00 PM.
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Old 04-20-2010, 08:28 PM   #4
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Humming Transformer


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Originally Posted by richez555 View Post
This device/transformer is inside my furnace room and has an irritating hum. Does anyone know what it it and how to fix it? See attached picture.
Probably a loose lamination or a loose portion of a winding. Possibly the factories today soak it in varnish just like always, and that may work for you.
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Old 04-21-2010, 07:51 AM   #5
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Humming Transformer


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Originally Posted by AllanJ View Post
There are three transformers shown in the picture. You may find that one is a little loose and tightening it up against the junction box reduces the hum. Or adding a screw to hold the junction box more tightly against the wall may reduce the hum.

There are other tricks, too, like remounting the transformer so a piece of sheet rubber between it and the J-box damps out some of the hum. Do not wrap the transformer; it could overheat as a result.

Pressing your finger here and there may help figure out which transformer is making the most noise.
Are these expensive to replace?
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Old 04-21-2010, 07:52 AM   #6
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Humming Transformer


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Originally Posted by Scuba_Dave View Post
Looks like Doorbell transformers
Do you have an Alarm system ?
Alarm, doorbell and thermostat? Can I replace the noisy one inexpensively?
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Old 04-21-2010, 09:23 AM   #7
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Humming Transformer


The three transformers as shown look as if just one could be replaced if needed, easily.

You will have to find out the voltage and current/wattage rating if not marked on the transformer.

Usually it is as simple as disconnecting the wires and unscrewing one ring nut or a few mounting screws.

Some transformers hum because the parts were somewhat immobilized by varnish and now the varnish has shrunk and cracked letting the parts vibrate.

The transformer on the bottom and the one in the middle look as if they have removable side caps. If you are daring you might dissassemble it and wedge a thin piece of fiber in if the paper coil assembly is loose on the central core. This can reduce hum.

The transformer on the left looks as if you would have to undo some small metal tabs and unbend a metal piece that wraps around it in order to look inside.

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Last edited by AllanJ; 04-21-2010 at 09:31 AM.
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