coleman super saver

[txheat]

water is backing up into my wax and hp soap chemical holding tank while using only rinse option (clean bay walls). There are no check valves. Manifold has coils and tubing goes to water holding tank and onto the pump. How is fresh water backing up to the tank? I replace the hydrominder still no solution. Could it be the 1/2" solenoid?

 

[MEP001]

There is a 3/4" check valve under the fresh (usually hot) water tank for each pump. The soap and wax lines tee in there before the check valve.

 

[Greg Pack]

Also, check your incoming rinse water pressure- should be no more than 15-20 psi