Furnace Making Noise But No Heat – Troubleshooting Guide

Furnace Making Noise? What To Do... Proudfoot Services
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Furnace Making Noise but No Heat – Troubleshooting Guide


Having a furnace that makes noise but doesn’t provide any heat can be frustrating, especially during colder months. In this article, we will discuss the possible reasons behind this issue and provide you with some troubleshooting tips to help you resolve the problem.

Possible Causes

1. Thermostat Settings: The first thing you should check is your thermostat. Make sure it’s set to heat mode and that the temperature is set higher than the current room temperature. If the settings are correct, move on to the next possible causes.

2. Ignition Problems: A faulty ignition system can prevent your furnace from heating up. Check if the pilot light is lit or if the electronic ignition system is functioning properly. If not, you may need to call a professional to repair or replace the ignition system.

3. Gas Supply Issues: Another common cause of a furnace making noise but no heat is a problem with the gas supply. Check if the gas valve is open and if the gas supply to the furnace is uninterrupted. If there’s an issue, contact your gas provider or a qualified technician to address the problem.

4. Airflow Restrictions: Insufficient airflow can cause your furnace to overheat and shut down. Check the air filters and clean or replace them if necessary. Additionally, ensure that all vents and registers are open and not blocked by furniture or other objects.

5. Faulty Blower Motor: If the blower motor is not functioning correctly, it can result in a furnace making noise but no heat. Listen for any unusual sounds coming from the blower motor, and if necessary, have it inspected and repaired by a professional.

Troubleshooting Tips

1. Check the Air Filters: Dirty or clogged air filters can restrict airflow and cause heating issues. Clean or replace the filters regularly to ensure proper airflow.

2. Examine the Thermostat: Make sure your thermostat is set to the appropriate temperature and mode. Replace the batteries if needed and ensure it’s functioning correctly.

3. Inspect the Ignition System: If you have a pilot light, check if it’s lit. For electronic ignition systems, listen for clicking sounds indicating proper functioning. If there are any issues, consult a professional.

4. Verify the Gas Supply: Confirm that the gas valve is open and the gas supply is uninterrupted. If you suspect a gas leak, evacuate the area and contact your gas provider immediately.

5. Clean the Vents and Registers: Ensure that all vents and registers are free from obstructions. Vacuum any dust or debris that might hinder proper airflow.

6. Call a Professional: If you have tried the troubleshooting tips above and your furnace still isn’t generating heat, it’s best to seek assistance from a qualified technician. They can diagnose the problem accurately and provide the necessary repairs or replacements.


A furnace making noise but no heat can be a sign of various underlying issues. By following the troubleshooting tips mentioned in this article, you can identify and resolve the problem efficiently. Remember, if you’re unsure or unable to fix the issue on your own, it’s always recommended to consult a professional for assistance.