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07-22-2021, 08:26 PM
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#1
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Junior Member
Brand: Thor Motor Coach
Model: Chateau 22b
State: New York
Posts: 24
THOR #6388
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greywater level indicator
I have a chateau 22B. recently the greywater tank indicator on the status panel show 1/3 full even after dumping the tank. I tried sensor cleaning to no avail. Any thoughts on a dirty sensor or other sensor issue?
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07-22-2021, 08:34 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 2,672
THOR #11781
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In all my years of RV ownership, the tank level indicators being wonky are what I think of as normal. I now empty the tanks based on experience not the sensors.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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07-22-2021, 09:37 PM
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#3
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I think it's a case of, "learn to live with it."
Sorry!
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07-22-2021, 11:40 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: A.C.E. 27.2
State: Indiana
Posts: 1,842
THOR #14698
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Point in fact RV tank sensors suck. In several RV's we have owned over the years none of the sensors on the water tanks have been accurate. After dumping black, TP or solids can stick to a sensor and give a false reading. After dumping gray the sensors are usually wrong as they are still wet.
After you own a rig for awhile you will develop a 6th sense on when to dump the tanks.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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07-23-2021, 01:42 AM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
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Mine has external sensors so accumulated gunk isn’t a problem. They are no more accurate than any others. Personally, I think it’s some sort of a conspiracy. Reading the fluid level in a tank is not a scientific or engineering challenge yet here we all are!
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07-23-2021, 09:39 AM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: 2011 FW Hurricane 33T
State: England
Posts: 1,280
THOR #16471
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Quote:
Originally Posted by El Pirate
I have a chateau 22B. recently the greywater tank indicator on the status panel show 1/3 full even after dumping the tank. I tried sensor cleaning to no avail. Any thoughts on a dirty sensor or other sensor issue?
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Just look on the bright side, it is also showing you that it is 2/3 EMPTY!
More than enough for a couple of days.
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07-23-2021, 10:48 AM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Quantum RQ29
State: Ohio
Posts: 1,296
THOR #13648
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Welcome to the stuck sensor club.
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07-23-2021, 11:07 AM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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With proper cleaning you can get them to read accurately, temporarily. As said, the reliability of the sensors is on par with other fine quality items in RVs so why should anyone expect different from these? On my Omni the black and grey full sensors are at the very top, VERY top. So when they read full, guess what, no warning and they are full. Draining they may read empty or 1/3. Bathroom sink is plumbed to black tank. Sink drain is higher than toilet. When sink stops draining, do NOT flush the toilet. No I didn't try it and immediately drained black tank. Somewhere between 1/3 and 2/3 is the guessing game when to drain. Oh the fun of Rvs but I don't fret over it. Knowledge is power.
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2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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07-23-2021, 12:04 PM
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#9
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by Pete'sMH
Mine has external sensors so accumulated gunk isn’t a problem. They are no more accurate than any others. Personally, I think it’s some sort of a conspiracy. Reading the fluid level in a tank is not a scientific or engineering challenge yet here we all are!
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Hey Pete!
Just because you're paranoid: it doesn't mean that they're not out to get you...
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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08-07-2021, 06:15 PM
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#10
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Junior Member
Brand: Thor Motor Coach
Model: 26' Chateau Class C
State: Texas
Posts: 15
THOR #6437
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Tank sensors
In my 2015 Thor Chateau, the black & gray sensors are switched. It took a few times to figure this out. Gray is black and black is gray!!. I pay very little attention to what the sensors say. With 2 people I count on 4-5 days to empty black tank. You can tell when it starts sounding a little different. I leave my gray valve open for longer showers, dishwashing etc. until it's been about 4 days since last drained black tank then close the gray to have plenty of cleaner water going thru the hose after emptying the black. This method has worked well for me for years. I've never seen sensors work right in several rvs over the years
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08-08-2021, 09:49 PM
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#11
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Member
Brand: Thor Motor Coach
State: Oregon
Posts: 54
THOR #20539
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Quote:
Originally Posted by chunker21
With proper cleaning you can get them to read accurately, temporarily. As said, the reliability of the sensors is on par with other fine quality items in RVs so why should anyone expect different from these? On my Omni the black and grey full sensors are at the very top, VERY top. So when they read full, guess what, no warning and they are full. Draining they may read empty or 1/3. Bathroom sink is plumbed to black tank. Sink drain is higher than toilet. When sink stops draining, do NOT flush the toilet. No I didn't try it and immediately drained black tank. Somewhere between 1/3 and 2/3 is the guessing game when to drain. Oh the fun of Rvs but I don't fret over it. Knowledge is power.
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Please clarify:...(I'm confused) bathroom sink is plumbed to the black tank?...so I should assume that shower and kitchen sink is still plumbed to the grey water tank on your Motor Home...
I have a 24SJ Thor Citation on a Merc Sprinter chassis...would mine be the same configuration?
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08-08-2021, 10:07 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: Four Winds 28A
State: California
Posts: 431
THOR #21941
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Bathroom sink may be plumbed to the black water tank for two reasons: 1) It's closer to the black tank thus easier/cheaper to do it that way. 2) Black tanks work best with copious amounts of water. Some recommend hold flusher down for 10 seconds. The more water, the less likely solids will stick and harden.
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Wayne & Elissa
2021 THOR Four Winds 28A
Fallbrook, CA
Watchdog hardwired EMS, Alignment, Roadmaster front sway bar, vent covers, Dew Gutter
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08-08-2021, 10:29 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Four Winds 28A
State: California
Posts: 431
THOR #21941
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__________________
Wayne & Elissa
2021 THOR Four Winds 28A
Fallbrook, CA
Watchdog hardwired EMS, Alignment, Roadmaster front sway bar, vent covers, Dew Gutter
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08-09-2021, 12:00 AM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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Quote:
Originally Posted by Harmsy
Please clarify:...(I'm confused) bathroom sink is plumbed to the black tank?...so I should assume that shower and kitchen sink is still plumbed to the grey water tank on your Motor Home...
I have a 24SJ Thor Citation on a Merc Sprinter chassis...would mine be the same configuration?
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Correct the black tank gets stuff from the toilet and bathroom sink. Here's the fun part, when the black tank is full, it backs up in the bathroom sink. Make note to yourself, don't set your toothbrush in the sink. Today I was flushing the black tank from the last trip. Closed the gate valve to get some water in it to help the flush but I'm staying right there watching the level when I hear this water burp. Go in the bathroom and there's water splattered around the sink. Apparently as the black tank filled, pressure must have burped up the sink P trap. That doesn't give me much confidence in the tank vent.
__________________
2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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08-09-2021, 12:14 AM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
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Some models drain the bathroom sink into the black tank and some into the gray. You can either get the drawings or just open one dump valve while the bathroom faucet is on and the tank is empty. You want to see which it comes out of.
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08-09-2021, 12:21 AM
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#16
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Site Team
Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 8,726
THOR #1469
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Quote:
Originally Posted by El Pirate
I have a chateau 22B. recently the greywater tank indicator on the status panel show 1/3 full even after dumping the tank. I tried sensor cleaning to no avail. Any thoughts on a dirty sensor or other sensor issue?
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Take 10 minutes and go to the Thor Owner's Resource site, enter you vin and download the waste water diagram for your rig.
It's amazing how much you can learn about your individual rig with a little bit of time taken to download the information Thor makes available.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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08-10-2021, 01:24 AM
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#17
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Senior Member
Brand: Thor Motor Coach
Model: Windsport 29m
State: North Carolina
Posts: 521
THOR #9553
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Quote:
Originally Posted by El Pirate
I have a chateau 22B. recently the greywater tank indicator on the status panel show 1/3 full even after dumping the tank. I tried sensor cleaning to no avail. Any thoughts on a dirty sensor or other sensor issue?
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I installed the See Level system and even that is not that accurate. When you see the water rising in the toilet bowl or water backs up in the shower pan, it's time to dump. You can get creative on the side of the road with grey water in an emergency but dump the black tank often if your not sure or have some grocery bags handy to place in the bowl or a pee cup works as well!!!
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