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Old 09-01-2021, 05:16 PM   #1
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Brand: Thor Motor Coach
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New to forum, Tvjohn

Question, we have a new Thor Compass. Noticed that our computer shows two grey tanks but only one drains when I open grey tank. How do I get other one to flush? Thanks.

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Old 09-01-2021, 05:25 PM   #2
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You have a 19 gal "wastewater" tank which is probably black water and a 37 gallon gray water tank. So have you tried draining the blackwater tank to see if the indication changes?
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Old 09-01-2021, 06:36 PM   #3
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The for reply

Yes, Black tank flushes when I'm open position as does Grey but on the Lippert Computer it shows Black Empty, Grey Empty, Grey 2 at 33% full. How do I get that empty?
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Old 09-01-2021, 07:05 PM   #4
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What's it show for FW tank status. The specs say you only have 1 gray tank.
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Old 09-01-2021, 09:04 PM   #5
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FW shows 33%
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Old 09-02-2021, 11:49 AM   #6
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Not familiar with your model, but welcome to the forum. Hope you get it figured out. You can contact Thor and have them send you schematics.
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Old 09-02-2021, 12:21 PM   #7
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Welcome to the Forum, and never trust the sensors...
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Old 09-02-2021, 11:06 PM   #8
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Congrats and welcome. It sounds to me like your freshwater and grey 2 are actually one and the same. If you can, just add some freshwater and see if it moves the needle.
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Old 09-03-2021, 07:13 PM   #9
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Thank you all for replies
It seems I had rodents damage, chewed wires!
Just got it back fixed and Grey 2 tank now shows empty.
Hopefully all good now
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Old 09-03-2021, 09:30 PM   #10
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Welcome to the forum and glad you got it figured out/repaired.


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