Heat pump repair service call. Outdoor unit is a heat pump. When Furnace was replaced in October we wired system up as straight heat and cool on a 8444 thermostat. When there was a call for cool the outdoor unit would run in heat because the O terminal was not getting voltage. Replaced thermostat with a 8448 stat and wired system correctly for unit to be able to run in cooling mode. Checked system for proper operation.