Trane Furnace System Lockout

It does this every year.

Trane furnace system lockout.

This condition is known as lock out. After 2 weeks of working well the furnace started having the same lock out issues after 3 attempts to light. 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. 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.

Then reset the furnace. We also do not have an outside air source however we always keep the laundry room door open for better airflow. 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.

Since our hvac system is in our laundry room i understand that lint may cause some issues with the sensor. It then went into lockout. 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. The remedy to this problem is simple replace the air filter.

The furnace will go into lockout sometime in the next 24 hours. When i try to start up the system it shows normal heat call on the circuit board. After about 1 3 minutes the fan motor begins to run and delivers heat through the duct system. At least now i have a way to reset the lockout.

At least the instructions with the new board are a little better than what i had with the first one. I have a trane xl 80 system. Unfortunately this year i am on my own and don t know what to do. 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.

I ignites about six. All furnaces need to have adequate ventilation and a dirty air filter can cause a system lockout to occur. Most furnace lock outs are caused by problems with igniters flame sensors and limit switches.