Carrier 59MN7 with multiple faults

[tadc]

Well, the saga continues. I haven't had them back out yet, but last night while the furnace was running in High Fire after experiencing another Low Pressure fault, I noticed this:



The static pressure was bouncing around 0.00-0.01, which seems like a instrumentation fault. It will typically run more like 0.08 in high fire, and just now it's reading .06 at 330 CFM in low fire.

Any thoughts on what this means?