Trane Furnace System Lockout

Since our hvac system is in our laundry room i understand that lint may cause some issues with the sensor.

Trane furnace system lockout.

It then went into lockout. The remedy to this problem is simple replace the air filter. We also do not have an outside air source however we always keep the laundry room door open for better airflow. When i try to start up the system it shows normal heat call on the circuit board.

Three flashes on the trane furnace control board means that the vent pressure is too high or too low which then activates the pressure switch and causes a lockout. At least the instructions with the new board are a little better than what i had with the first one. Then reset the furnace. For example a clogged air filter may prevent an adequate supply of air from entering the system s cold air return that causes the heat exchanger limit switch to trip.

At least now i have a way to reset the lockout. Unfortunately this year i am on my own and don t know what to do. I have a trane xl 80 system. Gas and oil home heating furnaces trane xl 80 system lockout.

My trane furnace is flashing the 2 red light system lockout code. About 10 seconds after the hot igniter starts to glow the gas comes. Check all incoming and outgoing vents on the furnace air system including on the furnace and clear away anything that may be blocking the air flow. The system did the same thing tried twice to turn on but we still do not have 24v at the red and gray wires going into the top of the gas control.

After 2 weeks of working well the furnace started having the same lock out issues after 3 attempts to light. Your furnace normally will remain in the locked out state until you manually reset it. All furnaces need to have adequate ventilation and a dirty air filter can cause a system lockout to occur. If one of the sensors reports an unsafe condition the furnace controller shuts off fuel and power to prevent unsafe operation.

It does this every year. Most furnace lock outs are caused by problems with igniters flame sensors and limit switches. I ignites about six.