Came out today to replace a defrost control board on a Lennox heat pump model #13HPX-042-230-01, serial #5806D25697. I powered the system down and removed the disconnect. I removed the old board and installed a new defrost control board. I made all the proper wiring connections. Once the board was installed I called for heat and tested the system. The system started after a short delay. The supply temp is 117°F and the refrigerant pressures are within normal range. The system is operating properly at this time.