PCM C Flow shut down

I am experiencing this same problem right now. Anyone can advise?

vinas  did you find out what the problem was?

Hi,
I had faced a similar problem two times, and my findings were as below:

1st time: the issue was in the leaking sampling valve, which was malfunctioning, hence the flow was leaking out of it and hence no flow.

2nd time: it was the faulty PCM module itself. I replaced it, and it worked.

Below are my suggestions for troubleshooting:

1. Check if the septa is leaking.

2. Check and observe the actual flows when you switched on the PC; if they are negative, then try to zero the flow from the configuration; if the limit is beyond the range (in more negative), then you may need to replace the PCM assembly.

Please let me know your findings.