Toilet runs continuously

[lejamjr]

I have a 2013 Big Sky 3100rl and when I fill the water tank the toilet will run. I almost flooded the bathroom. I was thinking maybe the peddle might be sticking but it doesn't do it when im hooked directly to city water. Any ideas? Thanks in advance

 

[Rene T]

I’m thinking that when you are hooked up to city water, the pressure may be a little higher and squashing the seals getting them to hold

 

[jsb5717]

Probably just time to replace the flush valve. Usually they just end up leaking on the floor but still sounds like that's the problem.

 

[Carl n Susan]

If it is a Thetford toilet, just replace it now with a Dometic 320 before the Thetford overflows the bowl and floods the RV.

 

[RMcNeal]

What Carl said!!! Been there, done that and still have the T-Shirt.

 

[Daryles]

When you replace the toilet, install a shut off valve on the pipe.
Also buy a water alarm.

Detects as little as 1/32 inch of water to provide an effective early warning, minimizing the risk of water damage. Its a popular product! https://a.co/d/ggn9ODK

 

[lejamjr]

Probably just time to replace the flush valve. Usually they just end up leaking on the floor but still sounds like that's the problem.

I did about 1.5 years ago.

 

[lejamjr]

If it is a Thetford toilet, just replace it now with a Dometic 320 before the Thetford overflows the bowl and floods the RV.

It is