Zex's box failure?
 

So I have a mustang kit on my car. I think the zex box is failing because it is only spraying out fuel and no nitrous. I tried resetting it and it went back to normal a few times but failed again. Now when i try to reprogram it it wont spray nitrous anymore just fuel. Is the box broke? I only have 900psi going to it. Can I rebuild it? or should i get a new one? Is this common with zex? Thanks in advance fellas, happy weekend!

If you need an Nmu unit I have one that I will sell for $100. Pm if you want it.