Last week we picked up our 2015 5h wheel from a dealer. They took us through a walkthrough and explained how things work. We left the dealership and headed straight for a campground. The next morning when it was quiet, we noticed a humming noise. We cannot figure out where the sound is coming from. We did not notice it during the walkthrough, but that could have been because of the noise. The fireplace sits towards the front right by where the steps are to walk up to the bedroom. We can hear the sound in the 5th wheel as well as in the pass-through storage. Any ideas on what could be causing this? We never noticed this sound on our TT. This coach does have a residential fridge that sits farther back in the living space, but the sound is not coming from the fridge.

More than likely the fan on your converter. The hum will change depending on the load on the converter at any particular point in time.

It could be a number of things. I would check that your water pump isn't running constantly. Easy to check. If it's on, turn it off. If the humming stops, that's the issue. It could also be the converter fan. Unplug from campground power and undo the battery disconnect. If the humming stops, it's the converter cooling fan making the noise. It could also be the fireplace motor. To check this, turn it off. If the noise stops, that's the culprit.

Your 5th wheel is happy that you bought it and taking it on a trip....

I'd also suspect the converter. If you have a ferroresonant converter (somewhat doubtful with that new of an RV, I'd think), they can hum quite distinctively all the time if the transformer or its windings are at all loose. It's not a problem beyond the possible annoyance. Other converters can also make various noises from fans and such.

I know it's not the water pump. I wondered if it could be the converter (Xantrex Pro XM1000). But even now sitting in my driveway, closed up and winterized, but still hooked to shore power, I am hearing the noise. Would this be normal? The residential fridge is still on.

Humming sound in 5th wheel?? | Good Sam Community

time2roll
Nomad
Oct 22, 2020
Turn off the breakers one at a time. Main breaker(s) last. Then unplug.
12th_Man_Fan
Explorer
Oct 22, 2020
mrad wrote:
12th Man Fan wrote:
If you are rigged for a generator then I would suspect the ATF(auto transfer switch).

I am rigged for and do have an Onan 5500. I just tried turning both battery switches off and the humming sound was still there.

Unplug from shore power and see if it stops.
mrad
Explorer II
Oct 22, 2020
12th Man Fan wrote:
If you are rigged for a generator then I would suspect the ATF(auto transfer switch).

I am rigged for and do have an Onan 5500. I just tried turning both battery switches off and the humming sound was still there.
dougrainer
Nomad
Oct 22, 2020
Old-Biscuit wrote:
Xantrex Pro XM1000 is an 'INVERTER' used to inverter DC (from batteries) to AC for that residential fridge

'CONVERTER' used to converter AC from AC Source (shore/gen) to DC for the 12V System and maintaining/charging batteries

You could have BOTH...Inverter and Converter

If you unplug shore power then Converter will stop operating --- Converter Fan
Should stop as it is AC Powered

If you turn off Inverter....then it will stop
Inverter Manual

Determine which one is making the noise.
Humming could be 'Normal' or an indication of component failing

Are you positive about the CONVERTER fan is AC? Some Converter fans will stay running once the 120 is removed if the converter is hot enough for the fan to run. Doug
12th_Man_Fan
Explorer
Oct 22, 2020
If you are rigged for a generator then I would suspect the ATF(auto transfer switch).
way2roll
Navigator II
Oct 22, 2020
The fan on my inverter is pretty loud. I turn it off if plugged in to shore power.
ford_truck_guy
Nomad
Oct 22, 2020
I have a Xantrex Inverter that is going bad... The internal transfer/bypass switch is sticking... While that was / is going on, it developed a humming sound as well..

ASSUMING that will all go away once I replace it
Old-Biscuit
Explorer III
Oct 22, 2020
Xantrex Pro XM1000 is an 'INVERTER' used to inverter DC (from batteries) to AC for that residential fridge

'CONVERTER' used to converter AC from AC Source (shore/gen) to DC for the 12V System and maintaining/charging batteries

You could have BOTH...Inverter and Converter

If you unplug shore power then Converter will stop operating --- Converter Fan
Should stop as it is AC Powered

If you turn off Inverter....then it will stop
Inverter Manual

Determine which one is making the noise.
Humming could be 'Normal' or an indication of component failing
mrad
Explorer II
Oct 22, 2020
I know it's not the water pump. I wondered if it could be the converter (Xantrex Pro XM1000). But even now sitting in my driveway, closed up and winterized, but still hooked to shore power, I am hearing the noise. Would this be normal? The residential fridge is still on.
DrewE
Explorer II
Oct 22, 2020
I'd also suspect the converter. If you have a ferroresonant converter (somewhat doubtful with that new of an RV, I'd think), they can hum quite distinctively all the time if the transformer or its windings are at all loose. It's not a problem beyond the possible annoyance. Other converters can also make various noises from fans and such.

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Humming sound in 5th wheel??

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