Good morning. I had my pump on circulate last night for a 4 hour cycle which meant it would shut off some time during the night. This morning I went to turn on the pump and heater for the day, and switch the multiport valve to filter. After switching the valve to filter the water runs out of the drain port. It's like the valve is stuck open. In all positions the water continues to just run out of the drain port - this is with the pump off. So somehow something is not closing as it should. Any ideas??? Thanks in advance for any advice you may offer.