Lennox Error Code 401

Priority condition: Information Only-Dealer Either the compressor ran for more than 18 hours continuously while attempting to cool the home during a single demand or the system refrigerant pressure is low. • Alert code will not lockout system. • If the two-stage outdoor unit has an outdoor control with flashing LED lights then the unit will run in low speed; • An outdoor control with a seven-segment display, the outdoor control will display alert code 401, but continue to run in high speed. • If the outdoor unit is a heat pump, and the outdoor temperature is less than 65°F, alert code 401 is ignored. • Also monitors low pressure switch trips.