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Old 11-28-2021, 03:08 AM   #1
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Brand: Thor Motor Coach
Model: Palazzo 33.2
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Water pump cycling too often

Recently we noticed our water system is not holding pressure. The pump cycles about once every 30 seconds. I thought at 1st it was the water pump check valve and so I replaced the water pump. This did not help. There are no water leaks. The only other thing I can think of is that the Anderson 4 way water intake valve has a leak internally and water is shunting back into the holding tank. Getting to the valve is a bitch but cartridge access is easy. Questions: diagnosis correct? 2: anyone know of parts source for the cartridge?

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Old 11-28-2021, 03:21 AM   #2
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Originally Posted by rudyhehn View Post
Recently we noticed our water system is not holding pressure. The pump cycles about once every 30 seconds. I thought at 1st it was the water pump check valve and so I replaced the water pump. This did not help. There are no water leaks. The only other thing I can think of is that the Anderson 4 way water intake valve has a leak internally and water is shunting back into the holding tank. Getting to the valve is a bitch but cartridge access is easy. Questions: diagnosis correct? 2: anyone know of parts source for the cartridge?
With no visible external leaks the Anderson valve internal leak is your next likely suspect and a common failure item.
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Old 11-28-2021, 07:23 PM   #3
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Try adjusting the sensitivity of the pressure switch. Depending on the pump model itís probably a screw atop the pump.
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Old 11-28-2021, 07:44 PM   #4
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Try adjusting the sensitivity of the pressure switch. Depending on the pump model itís probably a screw atop the pump.
On both the old and new pumps?
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Old 11-28-2021, 09:19 PM   #5
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On both the old and new pumps?


It doesnít cost anything to try it. It worked for me when I bought a new pump on my last rig.
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Old 12-06-2021, 11:19 PM   #6
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Update. I was able to find a new cylinder for the 4 way valve from Atlantic Marine (321-501-4262. I replaced the cylinder and the system now holds pressure and functions normally. Repair took and hour. I now have a new water pump as a bonus, probably not needed. Oh well.....
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Old 12-11-2021, 07:27 PM   #7
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Update. I was able to find a new cylinder for the 4 way valve from Atlantic Marine (321-501-4262. I replaced the cylinder and the system now holds pressure and functions normally. Repair took and hour. I now have a new water pump as a bonus, probably not needed. Oh well.....
Spares are great to have! Glad you got unit fixed.
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Old 12-11-2021, 07:37 PM   #8
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2nd idea is spot on. Exactly what happened to me. It took a stethoscope to hear the water passing through the Anderson valve.

The replacement valve is brass, The old one was plastic. You can order them from Anderson valve directly for $160. or RV parts dealer was $320.

I also have a spare pump now.
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Old 12-11-2021, 08:24 PM   #9
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my water pump died when it was 7 years old, you may need it..


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Update. I was able to find a new cylinder for the 4 way valve from Atlantic Marine (321-501-4262. I replaced the cylinder and the system now holds pressure and functions normally. Repair took and hour. I now have a new water pump as a bonus, probably not needed. Oh well.....
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