Two things that I would do. The easiest is to disconnect all power, then pull each breaker out and check the 120VAC screw connection(s) for tightness, The next is to pull the basement bulkhead panel and check the converter fan, especially if it's a WFCO. They use a low end 100mm computer case fan that can be fairly easily replaced with a better one (that I have on my to do list). Then that 5er with a residential fridge - it may also require that that you have an inverter, probably a Xantrex. That too will have a cooling fan. We had no problem with our last 5er with that but it too may be causing noise. We don't have an inverter on this 5er, so my history is fading.
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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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