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I have a situation with a goodman 2 ton-410 unit--first was given wrong txv--installed new txv- getting high head pressures, unit goes out on high pressure. I can run the unit with the bulb off the suction line, but have 8 degree superheat, and 26 degree sub-cooling-with bulb off of the suction line. When I put the bulb back on the suction line it takes about a minute to over pressure. Noticed 4 degree difference across filter dryer. It was 78 degree day and I was running 375 psi on high side, and a 50 degree coil. Could this unit be overcharged-did not weigh charge. Could it possibly be a blocked filter dryer that when the txv bulb is in ambient air and open it will run but when it starts to meter there's either a blockage or the bad luck of a bad txv. Also tried to shock txv with hot then cold water no change.