A retail store owner reports that the R-410A heat pump serv-ing the store is blowing cold air from time to time and not heating as it normally does. It runs constantly. The unit has a TXV. The technician turns the thermostat to the first stage of the heating mode. The air coming out of the air registers is cool; it feels like the return air. The outdoor unit is on the roof, and the indoor unit is in an attic crawl space. The thermostat is set with the first stage calling for heat; the outdoor unit should be on. The technician goes to the roof. The outdoor unit is running, but the gas line is cool. A gauge manifold is installed on the high and low sides of the system. The low side is operating in a vacuum, and the high-side pressure is 202 psig, which corresponds to the inside temperature of 70°F. This indicates that liquid refrigerant is in the condenser (the indoor coil). If the condenser pressure were 105 psig, well below the 202 psig corresponding to 70°F, it would indicate that the unit is low in refrigerant charge. What is the likely problem and the recommended solution?