North Carolina Noob question about high pressure light

I tried searching for a thread on this but couldn't find it, so I'll ask my noob question. My WaterFurnace envision unit (tall type with handler on top) keeps showing a red high pressure fault light. But... everything seems to continue working fine - i.e., the fault isn't cutting off the service). I've read, researched, watched videos, etc.; also changed filters, reset the fault by shutting off/restarting the unit. No luck with any of this. Does this indicate a bade high pressure switch mostly, or a malfunctioning comfort diagnostics module, or...?.?. Sorry if this is a silly question, but I'm hoping someone out here can provide a bit of info to help me. Thanks in advance!