u/relaxing

4th gen, 3 heads, 1 year old install, suddenly no has chill.

Error codes PC03 and PC31.

Hooking up a pressure manifold, the low gauge reads 275 PSI / 19 bar. I think that’s good? Does it matter which head’s service port I test?

Testing the low pressure switch with a multimeter reads open.

I thought I could be clever and jam a loop of wire into the board side switch connector to fool it into thinking the switch was closed, and while that did quiet the error, the system did not start producing cool air.

Ideas for other things to try?

Do I just need a new low pressure switch? I did try thwocking it with a screwdriver.