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Old 02-04-2024, 12:04 PM   #1
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Default Thor Sequence 20K water issue

When we hooked to city water, it fills the holding tank and overflows

So we can only use the pump and the tank does anyone know what we might can do on the road to fix this this is a brand new RV and I donít really trust many of the sales centers to fix problems. I was just wondering if anyone else had this problem
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Old 02-05-2024, 06:09 PM   #2
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If the freshwater tank, then you have a problem with your water pump backflow valve. This valve stops city water from flowing into your fresh storage tank. Either a piece of plastic has lodged the valve open, or the valve has failed. Go to a rv repair place if you cannot do the repair yourself. Try to lookup the location of your 12v water pump to see if you can get to it. If the RV is new, then your warranty should cover this problem.
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Old 02-05-2024, 06:54 PM   #3
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Using either the water fill or the city water connection produce the same result? Have you confirmed that?
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Old 02-06-2024, 03:39 PM   #4
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In my past RVs, there was always a switch that needed to turned to stop the city fill from filling the fresh. Since mine were all in different places, your manual should tell you where it is. If there is no manual, try a youtube sales walkthrough... they might cover it.
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Old 02-06-2024, 06:57 PM   #5
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Originally Posted by mumkin View Post
In my past RVs, there was always a switch that needed to turned to stop the city fill from filling the fresh. Since mine were all in different places, your manual should tell you where it is. If there is no manual, try a youtube sales walkthrough... they might cover it.
I second that, in my DIY build I have a solenoid water valve to prevent auto fill. Look for a switch.
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Old 02-08-2024, 08:47 PM   #6
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I worked on a friend RV with similar problem and the culprit was the water pump itself (culprit is the diaphragm..). Installed a new pump and problem solved...! bought a "generic" pump on Amazon and took us less than 15 min to replaced. It has been over one year and all still working fine. As your RV is new, it may be still on warranty (Most pump are one year warranty...!). Hope this helps, cheers,
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Old 02-08-2024, 09:22 PM   #7
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I had the same issue. The former owner didn’t winterize the rig, causing a hairline crack in the water pump housing resulting in city water back flowing into the fresh water tank. I purchased a new water pump housing from amazon ($21.50 in 201, exchanged the pump motor onto the new pump housing and all was good.
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Old 02-08-2024, 10:09 PM   #8
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Originally Posted by mloganusda View Post
If the freshwater tank, then you have a problem with your water pump backflow valve. This valve stops city water from flowing into your fresh storage tank. Either a piece of plastic has lodged the valve open, or the valve has failed. Go to a rv repair place if you cannot do the repair yourself. Try to lookup the location of your 12v water pump to see if you can get to it. If the RV is new, then your warranty should cover this problem.
This is the correct answer. There is no switch or solenoid on Thor B vans. There are two check valves, one in the water pump and one at the city fill input connection.

Until you get it fixed, just use the tank and water pump. We almost never use city fill on our 2020 20AT.


Happy trails.
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Old 02-09-2024, 04:22 PM   #9
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JMO, but I'll never understand why anyone would hook up to city water in a Class B. Fill the fresh water tank, keeps water fresh, easy to come and go with your vehicle, water pressure regulators can fail and ruin an RV. If there's a leak, you'll hear the pump running. Flip a switch if you go for a walk or whatever. The list goes on.
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Old 02-09-2024, 04:35 PM   #10
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JMO, but I'll never understand why anyone would hook up to city water in a Class B. Fill the fresh water tank, keeps water fresh, easy to come and go with your vehicle, water pressure regulators can fail and ruin an RV. If there's a leak, you'll hear the pump running. Flip a switch if you go for a walk or whatever. The list goes on.
I agree.

However, note that the same configuration that is used for city water is also necessary to properly blow out the system during winterization.

So, unless you are one of those who believe in putting that pink stuff in their system, having a functional city-water system is still important.
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