My previous thread on this problem:
rvthe.us
Update:
The SeeLevel II system in our Airstream has worked pretty well with exception of the fresh water tank gauge. Our model is the 709-P3 which displays the levels of all three tanks (fresh, gray, and black), battery voltage, and a power switch for the fresh water pump.
Within the first month of when we bought the Airstream new, I would see a "0" on the display for the fresh water tank when I knew the level wasn't zero. This only happened occasionally and never bothered us. Over the first couple years of ownership the problem got worse until last summer the fresh tank would read "0" most of the time, but occasionally would read the correct value or a seemingly random value.
We took the trailer back to Airstream this fall for it's 2 year end of warranty checkup and had a few other things fixed. They looked at the SeeLevel and recrimped the fresh tank wiring between the display panel and the tank sensor. They filled and drained the fresh tank three times and the gauge worked perfectly every time. I have no doubt that the gauge was working when they tested it. The Airstream service center has a great reputation for doing high quality work. When I picked the trailer up the tank was empty and the gauge read empty, so there was no way the gauge could be tested.
We left on a trip a couple days later and low and behold the gauge displayed "0" when the tank was full.
I called Garnet, who makes the SeeLevel, and talked to Dean. We discussed the problem for several minutes. I described that the gauge will read 0 or anything from 0 to 100% when the tank is full and anything between the correct value and 0 when the tank isn't full. There was also one behavior of the display that I noticed a few times. The red numbers on the display will pulse brighter for just a moment then return to the normal brightness. Dean had not heard of this, but went off to talk to a couple colleagues. When he came back to the phone he said that one of the other guys had never seen the pulsing, but had heard of it happening a couple times before and from an engineering standpoint it is possible under certain malfunction conditions and would explain what I'm seeing and the inaccurate display values.
Garnet is sending me a new display panel under warranty.
The customer service I received from Garnet has been fantastic plus I never had to wait on hold. I'm a big fan of Dean and Garnet Industries.
I sure hope the new display panel fixes the problem, because I sure don't want to have to replace the sender on the tank.
We'll see.
SeeLevel II - fresh water tank gauge intermittently not working
Our fresh water tank gauge intermittently either works correctly or displays OPn, which I assume means "open". Has anyone see this and/or have any idea what it means?

Update:
The SeeLevel II system in our Airstream has worked pretty well with exception of the fresh water tank gauge. Our model is the 709-P3 which displays the levels of all three tanks (fresh, gray, and black), battery voltage, and a power switch for the fresh water pump.
Within the first month of when we bought the Airstream new, I would see a "0" on the display for the fresh water tank when I knew the level wasn't zero. This only happened occasionally and never bothered us. Over the first couple years of ownership the problem got worse until last summer the fresh tank would read "0" most of the time, but occasionally would read the correct value or a seemingly random value.
We took the trailer back to Airstream this fall for it's 2 year end of warranty checkup and had a few other things fixed. They looked at the SeeLevel and recrimped the fresh tank wiring between the display panel and the tank sensor. They filled and drained the fresh tank three times and the gauge worked perfectly every time. I have no doubt that the gauge was working when they tested it. The Airstream service center has a great reputation for doing high quality work. When I picked the trailer up the tank was empty and the gauge read empty, so there was no way the gauge could be tested.
We left on a trip a couple days later and low and behold the gauge displayed "0" when the tank was full.

I called Garnet, who makes the SeeLevel, and talked to Dean. We discussed the problem for several minutes. I described that the gauge will read 0 or anything from 0 to 100% when the tank is full and anything between the correct value and 0 when the tank isn't full. There was also one behavior of the display that I noticed a few times. The red numbers on the display will pulse brighter for just a moment then return to the normal brightness. Dean had not heard of this, but went off to talk to a couple colleagues. When he came back to the phone he said that one of the other guys had never seen the pulsing, but had heard of it happening a couple times before and from an engineering standpoint it is possible under certain malfunction conditions and would explain what I'm seeing and the inaccurate display values.
Garnet is sending me a new display panel under warranty.
The customer service I received from Garnet has been fantastic plus I never had to wait on hold. I'm a big fan of Dean and Garnet Industries.
I sure hope the new display panel fixes the problem, because I sure don't want to have to replace the sender on the tank.
We'll see.
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