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Hello, clarify please if it is refrigerant R-410a or if it is actually R-401.. there is a huge difference between the two... R 410a is pervasively the most common for air conditioning applications.
Tell me the exact outside temperature when you are reading 310 psig high side.
and... if the suction line attached to the compressor is cool, cold or frosty at that time.
We can go from there.
Thanks. the system is slightly low on refrigerant, depending on its SEER rating the head pressure should be 316 for an 18 seer system, and 336 for a 15 or 16 seer system... and 5 tp 15 psig higher for a 13 or 14 seer system.
It is also possible that cooling coil is ice over, and blocking air flow to the vents, tell me if that seems to be the case or not, we can go from there.
OK, that will work.