The best way is to consult your furnace’s owner’s manual to see what the code means and what troubleshooting steps you can try. And if you are unable to fix the problem yourself, you should call a qualified HVAC technician.
Safety Guidelines:
- Always turn off the elec./gas supply to the furnace before working on it.
- Be careful not to damage the furnace wiring.
- If you are not comfortable working on your furnace yourself, call a qualified HVAC technician.
Flame Sensor Dirty or Not Properly Aligned
| 1. Turn off the gas supply to the furnace. This is a safety precaution to prevent gas from leaking into the home. 2. Locate the flame sensor. The flame sensor is usually located in the combustion chamber near the burner. It is a small metal rod with a wire attached to it. 3. Clean the flame sensor. Use a soft brush or vacuum cleaner to remove any dirt or dust from the flame sensor. Be careful not to damage the flame sensor. 4. Check the alignment of the flame sensor. The flame sensor should be positioned so that it is directly in the path of the flame. If the flame sensor is not aligned properly, it will not be able to detect the flame and the furnace will not shut down. 5. Turn on the gas supply to the furnace. 6. Test the furnace. Turn on the furnace and see if it ignites and runs properly. If the furnace does not ignite, repeat the steps above. Here are some additional tips for fixing a dirty or not properly aligned flame sensor: – Use a can of compressed air to blow out any dust or debris from the flame sensor. – If the flame sensor is heavily corroded, you may need to replace it. – Make sure that the flame sensor is properly grounded. – Check the wiring to the flame sensor to make sure that it is secure. |
Pressure Switch Stuck Open
| 1. Turn off the gas supply to the furnace. This is a safety precaution to prevent gas from leaking into the home. 2. Locate the pressure switch. The pressure switch is usually located near the inducer motor. It is a small, square-shaped device with two wires attached to it. 3. Check the pressure switch hose. The pressure switch hose connects the pressure switch to the inducer motor. Make sure that the hose is not kinked or damaged. If the hose is kinked or damaged, replace it. 4. Clean the pressure switch port. The pressure switch port is located on the pressure switch. Use a soft brush or vacuum cleaner to remove any dirt or dust from the pressure switch port. 5. Test the pressure switch. To test the pressure switch, apply a vacuum to the pressure switch port. The pressure switch should close when a vacuum is applied. If the pressure switch does not close, replace it. 6. Turn on the gas supply to the furnace. 7. Test the furnace. Turn on the furnace and see if it ignites and runs properly. If the furnace does not ignite, repeat the steps above. Here are some additional tips for fixing a stuck open pressure switch: – Use a can of compressed air to blow out any dust or debris from the pressure switch port. If the pressure switch is heavily corroded, you may need to replace it. – Make sure that the pressure switch is properly grounded. – Check the wiring to the pressure switch to make sure that it is secure. |
Pressure Switch Stuck Closed
| 1. Turn off the gas supply to the furnace. 2. Locate the pressure switch. The pressure switch is usually located near the inducer motor. It is a small, square-shaped device with two wires attached to it. 3. Check the pressure switch hose. The pressure switch hose connects the pressure switch to the inducer motor. Make sure that the hose is not kinked or damaged. If the hose is kinked or damaged, replace it. 4. Clean the pressure switch port. The pressure switch port is located on the pressure switch. Use a soft brush or vacuum cleaner to remove any dirt or dust from the pressure switch port. 5. Test the pressure switch. To test the pressure switch, apply a vacuum to the pressure switch port. The pressure switch should open when a vacuum is applied. If the pressure switch does not open, replace it. 6. Turn on the gas supply to the furnace. 7. Test the furnace. Turn on the furnace and see if it ignites and runs properly. If the furnace does not ignite, repeat the steps above. Here are some additional tips for fixing a stuck closed pressure switch: – Use a can of compressed air to blow out any dust or debris from the pressure switch port. If the pressure switch is heavily corroded, you may need to replace it. – Make sure that the pressure switch is properly grounded. – Check the wiring to the pressure switch to make sure that it is secure. |
Limit Switch Open
| 1. Turn off the gas supply to the furnace. 2. Locate the limit switch. The limit switch is usually located near the heat exchanger. It is a small, metal rod with a wire attached to it. 3. Check the limit switch wires. Make sure that the limit switch wires are properly connected. If the wires are loose or damaged, repair or replace them. 4. Clean the limit switch. Use a soft brush or vacuum cleaner to remove any dirt or dust from the limit switch. 5. Test the limit switch. To test the limit switch, apply heat to the limit switch. The limit switch should close when heat is applied. If the limit switch does not close, replace it. 6. Turn on the gas supply to the furnace. 7. Test the furnace. Turn on the furnace and see if it ignites and runs properly. If the furnace does not ignite, repeat the steps above. Here are some additional tips for fixing an open limit switch: – Make sure that the furnace filter is clean. – Make sure that the vents are not blocked. – Make sure that the furnace is getting enough airflow. – Check the furnace heat exchanger for cracks or damage. |
Rollout Switch Open
| 1. Turn off the gas supply to the furnace. 2. Locate the rollout switch. The rollout switch is usually located near the heat exchanger. It is a small, metal rod with a wire attached to it. 3. Check the rollout switch wires. Make sure that the rollout switch wires are properly connected. If the wires are loose or damaged, repair or replace them. 4. Clean the rollout switch. Use a soft brush or vacuum cleaner to remove any dirt or dust from the rollout switch. 5. Test the rollout switch. To test the rollout switch, apply heat to the rollout switch. The rollout switch should close when heat is applied. If the rollout switch does not close, replace it. 6. Turn on the gas supply to the furnace. 7. Test the furnace. Turn on the furnace and see if it ignites and runs properly. If the furnace does not ignite, repeat the steps above. Here are some additional tips for fixing an open rollout switch: – Make sure that the furnace filter is clean. – Make sure that the vents are not blocked. – Make sure that the furnace is getting enough airflow. – Check the furnace heat exchanger for cracks or damage. |
Blower Motor Not Running
| 1. Turn off the gas supply to the furnace. 2. Locate the blower motor. The blower motor is usually located near the heat exchanger. It is a large, electric motor that drives the furnace fan. 3. Check the blower motor power cord. Make sure that the blower motor power cord is properly connected. If the power cord is loose or damaged, repair or replace it. 4. Clean the blower motor. Use a soft brush or vacuum cleaner to remove any dirt or dust from the blower motor. 5. Test the blower motor. To test the blower motor, apply power to the blower motor directly. If the blower motor does not run, replace it. 6. Turn on the gas supply to the furnace. 7. Test the furnace. Turn on the furnace and see if the blower motor runs properly. If the blower motor does not run, repeat the steps above. Here are some additional tips for fixing a blower motor that is not running: – Check the furnace capacitor. The furnace capacitor is a small, electrical component that helps to start the blower motor. If the capacitor is defective, it will prevent the blower motor from starting. – Check the blower motor relay. The blower motor relay is a small, electrical switch that turns the blower motor on and off. If the relay is defective, it will prevent the blower motor from turning on. – Check the furnace control board. The furnace control board is the main circuit board that controls the furnace. If the control board is defective, it will prevent the blower motor from turning on. |