The unit was turning off on high pressure in heating mode. I removed 8 oz of refrigerant but then the cooling seemed to be off. I added it back and cooling got better but then it tripped on high pressure again. I called Amana tech support and reconfigured the blower dip switches. The unit was set several 100 cfm too low. After this I still struggled getting the charge just right until I screwed the txv valve for cooling in clockwise several turns to get 7 degrees Superheat. Then I checked subcooling and had 8 degrees which is what the target is. The unit in heating modes operating above pressure table but the ambient air temperature and indoor temp are above table ratings. However it is not cutting off on high pressure. Unit operating normal in both modes with normal air flow and refrigerant charge confirmed proper.