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Old 10-21-2015, 07:02 PM   #1
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Question City water backing up into fresh water tank.

Has anyone experienced city water backing up into fresh water tank? This has happened to us twice. The first time was over night and woke up to wet carpet in bedroom. This past weekend it happened again, but we caught it in time.

Service department did not know what the cause could be from both times.

Any one else have this problem?

Our unit is a 2012 Forester.
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Old 10-21-2015, 07:07 PM   #2
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Yes. Replaced water pump (under warranty) & it corrected problem.
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Old 10-21-2015, 07:15 PM   #3
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Is the FW tank over flow tube capped or plugged?

Could be the FW check valve.
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Old 10-21-2015, 07:32 PM   #4
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Your water pump is allowing a backflow into the tank. The head of the pump is where the check valve is located. Sometimes one can shut off shore water and turn on the pump on and off several times with a faucet open to try and reset the baffle inside the pump. If that doesn't work and you have the winterization input hose with a selector valve to pump antifreeze with the pump and the antifreeze hose has a cap on it you could select winterization mode for the pump and the water will not backfill into your tank. It will be routed to the capped winterization hose. This should suffice till you can get a new pump or repair the one you have.
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Old 10-21-2015, 08:08 PM   #5
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Thank you all....will check out your suggestions.
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Old 10-22-2015, 08:20 AM   #6
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There should be a check valve at the water pump that prevents water from push backwards through the pump to the FW tank.

It sounds like your check valve is stuck or blown out and needs to be replaced.


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Old 10-22-2015, 08:29 AM   #7
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Quote:
Originally Posted by CJnDD View Post
The first time was over night and woke up to wet carpet in bedroom.
How did this happen? Is your FW tank under your bed? I'm not familiar with your unit.
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Old 10-22-2015, 11:18 AM   #8
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Yes FW tank is under bed.
I brought the unit in the first time and service department could not find anything wrong. Yesterday I went in, without the unit, and told them the same thing happened. They still say they have never run across this before.

The pump is in a very thight place that is extremely hard to get to. Impossible to get to the valve in it's location. I will have to bring the unit back to them.
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Old 10-22-2015, 11:35 AM   #9
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When you take it back have them come to this site and run a search for "water back flowing into fresh water tank". Should enlighten them.
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Old 10-22-2015, 12:31 PM   #10
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Your service department's techs are either stupid, or they're lying to you about "never seen THAT before".

Not rocket science.........

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