A malfunctioning furnace during cold weather can be distressing. Knowing what to do when your furnace stops working can save you from discomfort. This article provides a step-by-step guide to troubleshoot and address issues when your furnace fails.

Assess the Situation

1. Check the Thermostat: Ensure the thermostat is set to "heat" mode and set to a temperature higher than the current room temperature. Replace the batteries if needed.

2. Inspect Power Supply: Verify that the furnace is receiving power. Check the circuit breaker and reset it if necessary. Also, check the furnace switch to ensure it's turned on.

Check for Basic Issues

1. Inspect Air Filters: Dirty or clogged filters can obstruct airflow, causing the furnace to malfunction. Replace or clean the filters if they're dirty.

2. Check Air Vents and Registers: Ensure all vents and registers are open and unobstructed to allow proper airflow throughout the house.

Examine the Furnace

1. Inspect the Pilot Light (for Gas Furnaces): If the pilot light is out, follow the manufacturer's instructions to relight it. If you're unsure or uncomfortable doing this, contact a professional.

2. Check for Error Codes: Modern furnaces often have LED displays that show error codes. The LED should be visible through a small window on the furnace door. The meaning of the error codes can usually be found on the inside of the furnace door. (Note: the LED will not be powered when the door is removed)

Contact a Professional

1. Schedule Professional Inspection: If the furnace still doesn't work after these troubleshooting steps, it's time to call a certified HVAC technician. Explain the steps you've taken and the symptoms observed for a more accurate diagnosis.

2. Avoid DIY Fixes: Furnaces are complex systems. Attempting DIY repairs without proper knowledge and tools may cause more damage or risk safety hazards.

3. Prepare the Area for Repair: Ensure the area around the furnace is free from obstruction. This will save the technician time (and you money) in diagnosing and repairing your furnace.

4. Have all the facts when you call: Providing the technician with the symptoms of your malfunctioning furnace before they arrive will help ensure the technician arrives with the material and tools needed to repair your system.

5. Know Your Furnace’s Model Number: Knowing your furnace’s model number and serial number can speed up the process of ordering new parts for your furnace. The model and serial number are usually located on a sticker within the furnace or on the furnace door.

Preventive Measures for Future Incidents

1. Regular Maintenance: Schedule annual furnace inspections and maintenance to ensure it operates efficiently and prevents sudden breakdowns.

2. Emergency Preparedness: Consider investing in a backup heat source or portable heaters to stay warm during furnace outages, especially in extreme weather conditions.

Conclusion

Encountering a non-functional furnace can be stressful, but following these troubleshooting steps can often identify and resolve simple issues. Remember, safety comes first, and if you're unsure, it's always best to contact a professional HVAC technician to diagnose and fix furnace problems efficiently and safely.

For professional advice on furnace troubleshooting, contact HVAC Expert Tech. Our experienced team is committed to providing reliable HVAC services tailored to your needs.