Fresh water tank filling on its own?

[RanchoVectra]

The fresh water tank on our 05 Vectra appears to be filling up on its own. The coach is always parked and hooked up to city water, and twce in the last month the fw tank has started to overflow out the drip line provided for this purpose. Three weeks ago I drained it down to under two thirds full, and as of yesterday it was full again. I am going to call the dealer, but have any of you had this problem or heard of this issue? I am guessing the city water/fill tank valve is defective, but thought I'd check to see if anyone else has had the issue.

Thanks in advance....

[RanchoVectra]

The fresh water tank on our 05 Vectra appears to be filling up on its own. The coach is always parked and hooked up to city water, and twce in the last month the fw tank has started to overflow out the drip line provided for this purpose. Three weeks ago I drained it down to under two thirds full, and as of yesterday it was full again. I am going to call the dealer, but have any of you had this problem or heard of this issue? I am guessing the city water/fill tank valve is defective, but thought I'd check to see if anyone else has had the issue.

Thanks in advance....

[ISLAPP]

Have not heard of that happening before, but my guess is that you are correct. It has to be in the valve. Have you tried turning it from one position to the other and then back to city fill?
Mike

[NLOVNIT]

We had this issue with an Aerolite TT a few years back, although ours was related to the placement of the check valve in relation to the pump. This may not help you, but sounds like, somewhere, a valve isn't working properly.

L-

[RanchoVectra]

Thanks for the replies. spoke to the dealer yesterday and they concur, likely the city water / tank fill valve. Another trip to the dealer, wonderful!