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Old 05-03-2015, 08:37 PM   #11
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As far as the tank flush, I usually fill my black tank using the BT Flush before I flush it to make sure there is enough water to give it a good flush.


I also flush the grey tank, close the valve, and open it again...I often get a second "whoosh" of water with the second pull of the valve.
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Old 05-03-2015, 08:38 PM   #12
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Originally Posted by CheckSix View Post
Hey Folks!

Remind me please... is the Auto setting set in the Fan mode on the Dometic thermostat? At 5:00am, I wasn't even thinking about the Auto setting... I just wanted the chill to go away.

On the tank dump... I cannot believe they didn't totally drain with all the time I gave it. Re: the clear connector... I have one. Other than the hole cut remainder blocking the hole, what other reason could there be for the tanks to not drain? Like I said, I've never had that happen before on the previous coach. Weird.
The fan setting is on the Domestic thermostat. I had the same problem the first time I used the furnace. I also asked about it on this forum. I still think that your tanks are empty.
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Old 05-03-2015, 08:40 PM   #13
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If water came flowing out when you drained both tanks it's more likely just the sensors getting a little dirty and throwing off the readings.

There's some good write-ups here on what's called the "Geo Method" for keeping the tanks clean and draining well. Might we worth a look.

Also, Try pumping a little water back in the tanks just after you empty. The agitation while you're driving might help clean things up a bit.
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Old 05-04-2015, 10:22 AM   #14
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Do you have the black tank wash system installed....I know it's harder at a dump station as people are usually waiting....but I back wash and fill and flush twice and usually get my sensors to read zero.

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Old 05-04-2015, 10:45 AM   #15
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Flush and clean your tanks.

Is it possible in your hurry to leave that you forgot to flush your tanks of any remaining debris that might be sitting on the sensor causing it to read improperly. Did you use fast dissolving toilet paper? Did you wash grease down your sink drain? Maybe you just need to flush the tanks. Some say dishwashing detergent works great to clean your tanks... anyway just a thought, your post wasn't the most thorough post and description of a problem. But you did not mention flushing the tanks. Just because they are empty doesn't mean they are clean and ready to use again.
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Old 05-04-2015, 10:51 AM   #16
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First, as others have said the sensors are completely unreliable. As long as something is making an electrical connection between the probes then it lights up. Could be a short, toilet paper, sludge, slime, etc...

However it sounds like you did also get some water from the grey tank at the storage yard. I find I'll always get a little, as the 'wetness' on the side of the tanks works it's way down into the drain pipe after bouncing it's way home. If it's a lot, then chances are the dump station wasn't level. The really good dump stations tilt your whole rig towards the drain, the ok ones are levelish, and the bad ones have sunken and now tilt your rig away from the drain. At those ones, if you notice it and you have the luxury of time, you'll want to throw a board or two under the passenger side to tilt your rig towards the drain. Otherwise, just dump what you can and plan to either dump again later or leave it for the next camping trip (if not too far away).






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Old 05-04-2015, 11:25 AM   #17
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Okay, just spoke to my buddy at the dealership. He said that I was used to the Itasca EXTERNAL tank sensors that instantly read the correct tank fill quantity. The FR GT sensors are INTERNAL and will read incorrectly while still wet for quite some time until they dry off. He thinks that since I heard the rush of tank volume going down the sewer line and that I waited in between tanks, that all is well and its just the INTERNAL tank sensors staying wet and holding the last reading.

I did not flush because there was a long waiting line behind me of folks wanting to dump and get going. I didn't want to be "one of those guys" that takes forever. I'm going to see if the Cabela's up the road from me has a dump station and if so, what I'll do is hook up and rinse the tanks.

He also confirmed that I just need to set the FAN to AUTO for the T-stat.

Thanks guys!
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Old 05-04-2015, 02:56 PM   #18
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Just to confirm... I went to the motorhome and took a bright flashlight and looked down the toilet with the pedal depressed.... Empty but wet inside.

Best answer is, it's the internal tank sensors being very slow to dry off and read correctly.
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Old 05-04-2015, 03:39 PM   #19
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I have noticed many "dump stations" are not level and in fact many sloipe the wrong way for my tanks. FR does provide some slop[e to the installed tank but not a lot. My MH sits slightly rear high on a level srface and my tanks are sloped to the back so even on a level surface I do not drain completely. I sometimes drop the front jacks at the dump station to provide a better slope for a better empty. Someting to watch for.
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Old 05-05-2015, 01:52 AM   #20
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Many times for what ever reason the lay out on the dump station puts you leaning to curb side and so you do not get a full dump. Our traveling mate insists that he always throws a block or two under the curb side wheels to be sure his class A gets EMPTY. I have a long drain hose so I do not get as close if it looks high on the dump side.
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