I arrived to a diagnostic service call. Discovered bad nest t-stat/replaced. Board is registering a high limit fault for whatever reason. Reset power a couple times and fault cleared itself. This is a R22 piston. Suction pressure going from 90psig to over 100psig. Evap saturation temp going from 50F to 60F. Evap coil is bad. Client will let me know what he wants to do.