Horrible First Time Out

[jeririgged223]

Originally Posted by lookingfornewadventure

Hi

Took our first trip in our new to us fifth wheel and had one problem after another. We had the thing independently inspected before we bought, so I can only imagine user error…

First, the previous owners had installed a plumbing loop of some kind hooking up city water and black tank flush to single hose, with a valve. I hooked up water, could not figure out what the strange cycling sound was, and low and behold water started pouring out of the toilet after a while. Sewer wasn’t hooked up yet, I noticed black tank sensor was full, so I ran to hook up and drain it. Thank god there was nothing “dirty” in there yet. First lesson learned, the little valve on the plumbing loop is REALLY important…. Should also add that they installed the LCI waste master sewer connections, if that matters.

Next I ran a load of towels in newly installed washer (dealer did it), made sure both grey tanks were open (dealer told us there was only one grey flush valve but thanks to this forum I knew better, thank you!) and in the spin cycle, water came pouring out into the carpeted bedroom, and all around the hitch outside. Mopped up that mess, bought a dehumidifier, and tried to turn on the furnace. After blowing for 30 seconds or so, it turns off. No sound of ignition outside. Stove works, gas is running. Then I tried to take a shower and the water isn’t draining from the shower pan at all. Sensors say tanks are empty, and I checked that kitchen sink is draining, and bathroom sink is draining.

We are at our wits end, are we overlooking something? Wondering if we bought a lemon, if there is more creative plumbing somewhere, etc…. Any and all suggestions are appreciated. We are dirty and cold! ��. Oh, yeah, 2018 3121. Thanks!

RULE #1.......ignore the sensors, we all know they'll read empty when full and full when empty.

The dealer may have made a general assumption. Not all 3120's have two gray tanks. Some only have one.

As the owner of a 2018 3120RL (same thing without the residential fridge) Montana Legacy I can only say you've got to have a clog somewhere and that's causing the shower not to drain and the washer / dryer to back up and overflow into the basement area. The Washer and the shower would be on the same gray tank and drain pipe. If possible run a hose with a high pressure nozzle up from the sewer connection and see if something blows free. Watch the toilet though, water could start to come up thru the black tank if there's a blockage. As for the black tank water loop, I have no experience with that. I like my two hose setup for fresh / black water tank fills.

[Carl n Susan]

Originally Posted by jeririgged223

....Not all 3120's have two gray tanks. Some only have one.....

Every Montana I have ever seen has *TWO* gray tanks, even the 3120's. The shower and galley utilize separate tanks regardless of the layout. There is often only one gray tank handle in the convienence center as the other (galley) gray tank has a fixed handle protruding either through the frame or out from under the coroplast.

....I can only say you've got to have a clog somewhere and that's causing the shower not to drain and the washer / dryer to back up and overflow into the basement area....

The OP wrote in Post#8 the HepVo valve was installed backwards and caused the backup.