Wondering has anyone had this problem:
York ducted split, runs fine in cool mode, pressures and current draw spot on.
Runs for about 4 min on heating and trips on HP.
Evap airflow is OK
Unit is not overcharged.
Unit uses two orifice refrigerant controls, 1 at condenser, 1 at evaporator.
Suspected that rubbish in evap orifice that blocked the orifice in heat mode - nothing.
This one is doing my head in, or maybe it's time to get out of the game.