1. A heat pump (HP) system, comprising: an indoor blower/heat exchanger (ID) system; an outdoor fan/heat exchanger and compressor (OD) system, said ID system and said OD system being fluidly coupled together by refrigerant tubing that forms a refrigerant system; a refrigerant high pressure sensor located on said refrigerant tubing and configured to provide a trip signal of said refrigerant system when a discharge pressure of the OD system exceeds a pressure limit; and a controller coupled to said heat pump system and configured to: receive said trip signal from said refrigerant high pressure sensor; and set a maximum heating % demand of said heat pump system based on a first heating % demand, said first heating % demand being a heating % demand at the time of said trip signal; calculate a second heating % demand based on said maximum heating % demand; and cause said HP pump system to operate based on at least one of said second heating % demand or said maximum heating % demand.