I havea 3 ton goodman heat pump and i am having some problems. It is a 410a system and it works perfect in the cooling mode but when i switch ot to heat mode it runs about 2 minutes then the outdoor unit kicks out. The contactor terminal on the defrost board is losing power which is whats shutting it down but i cant figure out why its doing this. The pressures in ac mode are right where they shud be but in the heat mode the high and low side pressures go up until it shuts down. Can anyone help me figure out why its shutting down in heat mode but not in the cooling mode? Ive replaced the defrost board but it didnt fix it. Im at a loss.