This spa is draining at night. Previous company replaced the suction and return 3 way valves. They installed the return valve backwards. The heater was on and the PVC overheated and expanded due to the blockage and almost burst. Then they tried to tell them there was a problem with the heater (which is new) and charge $500. Spa still draining at night. That's when they called me.
I installed a check valve on the spa return line. It's still draining at night. I took apart the suction side valve. It appears to be fully closed to the spa and sealing properly. I checked the blower line, that check valve is sealed and there was no water in it.
My next step was going to be to install another check valve on the suction side, but I wanted to ask you all what I'm missing.
The pool has water feature, but thats only on the pool, not the spa.
It does have a popup cleaning system. Could the water be siphoning back through that?
There is no smaller return line to the spa, the only one is the main one controlled by the return valve.
The pump on the right is to the water feature and I don't believe it's connected to the spa piping anywhere.
Any help is much appreciated!