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Old 11-07-2014, 09:20 AM   #1
Join Date: Aug 2012
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Humming Noise

We have a 2013 Fleetwood Bounder Classic that has a humming noise from a transfer switch. Located behind drawers next to refrigerator.
Anyone with that problem? Ron
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Old 11-08-2014, 04:50 AM   #2
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Some "hum" is acceptable from a transfer switch but it depends upon exactly how much hum it's creating and whether or not the hum is worse with heavy loads such as Air Conditioners running.

Does the hum occur only while on shore power or the generator or both?
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Old 11-08-2014, 06:04 AM   #3
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There are a few different types of transfer swithes. Some hum, some do not, Mine does not (intelletec)

Here is why

On mine the "Resting" state of the switch is connected to shore power.. That is IF NO power is present, Shore or generator, I am connected to the shore power inlet...

If Generator power is present, then when the timer times out, CLUNK and it transfers.

Others have two sets of normally open contactors (Relays, size big) when there is no power the resting state of the unit is NOT CONNECTED.
When shore power is sensed, then ONE set of contactors pulls in, these may have AC coils and those hum.

I do not know why they do it that way.. (I am sure, however, there is a reason, in fact I can think of one but I do not know if it is THE reason).

Another possible source:

I know some companies park the converter near where you cite. (Usually under the fridge) Damon parked the furnace there on mine (Which kind of makes me wonder about their engineers).
Home is where I park it!
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Old 11-08-2014, 08:19 AM   #4
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Mine hums all the time, because the damn thing doesn't know the words. Sorry, it was too easy.
2000 Dutch Star Pusher
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