Open intake pump and remove pump impeller. Replace pump cover. Connect the two wires from the solenoid valve to the two electrical motor lugs on the Crown Head, so that valve opens when head runs and closes when head stops. The direction of flow arrows should point toward the head. This will allow you to regulate the water flow into the bowl, and also to shut off the water for servicing, etc.
Water backs up into the deodorant tank, causing it to overflow.
Reinstall, being sure the arrow points toward the toilet and not toward the deodorant tank. If problem persists, replace the check valve, again being sure that arrow points to the toilet and not toward the deodorant tank. A. Refer to winterizing instructions in Owner's Manual. A. Raritan toilets are not by themselves designed to hold water unless a vented loop is installed in the discharge line with the top of the loop generally 4 inches higher than the top of the bowl. The higher the loop the more water will remain after each flush.