400PSI 
Hope you’re actually set up for that sort of pressure.
As stated repeatedly above, your coil almost certainly has ice in it…
do you know how to test your mol sieve?
how often do you regenerate them?
How?
see: Molecular sieve beads and perhaps some of the dozen or more other threads linked to that discussion.
Eg: Why is my bho green? (another classic sign of water…)