So…my spa emptied out one night and I figured there was some debris keeping my diverter valve open. I remove actuator and pull out the diverter assembly and it looks like this:

So I purchased another diverter valve assembly for $80…and within two days it happens again:

First, anyone know what causes this? The inside of the valve is smooth. Could it be I need to lube up the inside of the 3-way valve? Not sure what to try next. Any guidance appreciated!

So I purchased another diverter valve assembly for $80…and within two days it happens again:

First, anyone know what causes this? The inside of the valve is smooth. Could it be I need to lube up the inside of the 3-way valve? Not sure what to try next. Any guidance appreciated!