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Old 10-19-2016, 08:37 AM   #1
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Automatic LP crossover valve

I cannot get my valve to switch between tanks and end up switching tanks. Anyone know any tricks to troubleshooting this valve or should I just replace it. Is there a good, better, best valve.
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Old 10-19-2016, 08:49 AM   #2
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Try this:

Make sure both tanks are full and properly connected.
Turn both tanks ON
Make sure the switch is pointed to one tank.
When that tank is empty, it should switch to the other tank, but the physical switch will not change and the indicator will show RED, or empty for the tank it is physically pointed to.
Change the switch to point to the full tank and the indicator should turn GREEN.
Turn the empty tank OFF and disconnect and refill.
Reinstall the new full tank and turn it ON - do not change the switch.
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Old 10-19-2016, 09:56 AM   #3
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The actual tad on the changeover does NOT switch , but the flow should, 9nce you manually move the tab the indicator should turn green again providing the other bottle is full.
If it's a bad changeover, look at the Marshall brand online or in a rv parts store.
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Old 10-19-2016, 11:39 AM   #4
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Quote:
Originally Posted by RKamperRV View Post
Try this:

Make sure both tanks are full and properly connected.
Turn both tanks ON
Make sure the switch is pointed to one tank.
When that tank is empty, it should switch to the other tank, but the physical switch will not change and the indicator will show RED, or empty for the tank it is physically pointed to.
Change the switch to point to the full tank and the indicator should turn GREEN.
Turn the empty tank OFF and disconnect and refill.
Reinstall the new full tank and turn it ON - do not change the switch.


That is an excellent explanation.
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Old 10-19-2016, 01:49 PM   #5
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Old 10-19-2016, 04:49 PM   #6
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You'll go crazy thinking one tank is empty, and why won't it switch, and will it ever switch! Like a can of shaving cream, there is always a little bit more. Don't bother loosening, or shaking, or watching liquid levels. As long as the indicator is still green or black (depending on model, but not red), then it is drawing off the tank it is pointing towards. When the switchover occurs, as described, the red flag becomes very obvious in the window. Now flip the lever towards the new supply tank (i.e. the other one) and the red flag goes away. Now you can turn off and replace the first tank, just like they said.
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Old 10-20-2016, 03:12 PM   #7
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I've replaced ours twice already. Marshall is what I use also. And always keep a extra one on hand. Never want to look for one durning the Holidays.
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Old 10-21-2016, 07:53 AM   #8
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I've replaced ours twice already. Marshall is what I use also. And always keep a extra one on hand. Never want to look for one durning the Holidays.
That's really troubling. I have never changed even on on 3 different trailers over 25 years!
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Old 10-23-2016, 09:51 AM   #9
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The original failed after about a year. Bought a off brand, lasted about year and half. Bought a Marshall. Good to go. We full time also.
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