[Mark McLeod]

Are you using a double solenoid or two single solenoids?

One issue with the code is that the solenoids cannot work in opposition to each other. If you turn one on, then at the same time you should be turning the other off.
They have to be changed to False at some point.

Also, the compressor code doesn't go in periodic tasks, but whatever you've done is obviously not hurting. The compressor is started in Begin and then left alone.

The Open looks fine.