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Old 07-18-2020, 12:46 AM   #1
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Brand: Thor Motor Coach
Model: ACE
State: Washington
Posts: 1
THOR #19679
San-T-Flush

I'm wondering if there is a shutoff valve to the san-t-flush system on a 2018 Thor ACE 30.3.
When i hook up a hose, water on to flush the Black tank with the drain valve open nothing drains out.

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Old 07-18-2020, 12:57 AM   #2
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 9,798
THOR #7035
Has it ever worked? Usually no valve installed BUT there have been cases where the hose from the outside connection to the sani-flush was not connected and cases where the check valve at the outside connection was installed backwards.
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Old 07-18-2020, 01:32 AM   #3
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Brand: Entegra
Model: Accolade 37TS
State: South Carolina
Posts: 7,326
THOR #1469
There is a a one way check valve or vacuum breaker that when it malfunctions does not allow water through in either direction. Mine was under the bathroom sink. Changed it and the system was back to normal

Here is what was bad on my system a few years ago.

https://www.amazon.com/JR-Products-5...RDDJW8N75B622T
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Old 07-18-2020, 04:41 AM   #4
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Brand: Redwood
Model: 36FB
State: Arizona
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THOR #3610
Thor has also been known to mislabel the valves. You're sure you're opening the black tank? If so check the vacuum breaker, either installed backwards or has malfunctioned.
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Old 07-18-2020, 01:11 PM   #5
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Brand: DRV
Model: 44' Santa Fe
State: Montana
Posts: 384
THOR #2053
Several rigs ago I had a brand new rig that the backflo preventer was installed backwards. Won't work that way. Easy fix though. Good luck

Bill
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