Ok...so we've been to two dealers and have become massive detectives trying to figure out where this vibration is coming from and come up short. Hoping you folks can help us out because I am beyond frustrated (it's waking us up at night) and we're close to selling our RV.
We are full time travelers in a 2018 Winnebago Vista LX, 35F model. 8 weeks ago we started having a mystery vibration WHILE CAMPING. (not driving, just to be clear). Periodically, and for a length of 15-20 minutes at a time, we get a light, yet irritating coach-wide vibration that seems to originate from under our bed.
This is happening when we are parked, jacks down, slide-outs out.
It happens whether we are on shore-power or dry camping off the batteries/inverter. It happens on 30Amp and 50Amp equally.
We have turned off or checked that all of our appliances are off: refrigerator, water heater, furnace, ACs, water pumps, macerator, even our damned TV. We've unplugged the microwave we're so desperate. It is clearly NOT a compressor issue for the fridge or the AC unit running OR the furnace. These units are not vibrating nor running when it happens.
We've crawled under the coach while it's happening to see if we can feel it from outside and underneath and cannot seem to locate the source at all.
We CAN get it to stop by turning off the coach batteries. When we turn the batteries back on it sometimes stops permanently, sometimes it starts up again after 5 minutes.
Two dealers have checked our inverter and our electrical system and say it looks fine...but they also said the loud whistling noise in my water heater was "normal" until I pulled it out the heating element and descaled it. They obviously never even looked inside my water heater, so I'm guessing they didn't even bother checking my inverter--since I'm just a crazy lady hearing things
Since we cannot replicate the issue (it seems to happen randomly) we cannot get them to investigate deeper.
We have no clue where to go from here but since it kicks on at 2am sometimes and wakes us up in bed, we're about ready to burn our new RV.