It could be either one. It could also be a solenoid hanging open letting water back into the soap tank. I've had that problem at two different washes in the last month. I would start by eliminating the Hydrominder - make certain it isn't leaking by at all.Already got the holes on all the tubes. I'm wondering if the hydrominfer is overflowing the tank or could there be a check valve letting high pressure back into the tank from the bottom.
or could there be a check valve letting high pressure back into the tank from the bottom.
Dan nailed it. I had replumbed my soap and wax on bay two a couple months ago and I had not put them in backwards. Switched them around and it worked like a champ. Thanks Dan