Noise issue. Upon arrival found heat pump turned off and coil covered with ice. Turned unit on and it shortly went into defrost mode to melt off the ice. System turned back on and ran normally before getting rid of all the ice and getting the coil dry, found defrost timer set to 50. Moved pin to 90 for a longer defrost cycle in order to completely get rid of ice and dry coil before it turns on again. Checked refrigerant pressures and electrical components, found burnt contactor, found no flood protection inside. Quoted repairs and recommended getting quote to replace system due to age.