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I don't know the pressure numbers but they were checked with gagues by an a/c guy 2 weeks ago - he said they were correct for the R-410a system.
the air handler is in a first floor closet and does have a water safety switch: Rectorseal model SS2 installed to the right of the PVC drain pipe which goes to a sump pump hanging below - how can I check to see if that drain line is completely clear?
I'll try your suggested troubleshoot outline,