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Quick Troubleshooting Guide for Furnace Issues
Posted On: December 9, 2024
A malfunctioning furnace can be a major inconvenience, especially during colder months. Below is a simple guide to help identify and potentially resolve common furnace issues before calling a professional.
1. Furnace Won’t Turn On
- Check the Thermostat: Ensure it’s set to “Heat” and the temperature is set higher than the room temperature.
- Power Supply: Verify that the furnace is receiving power. Check the circuit breaker and reset it if necessary.
- Pilot Light or Ignition System: For older models, ensure the pilot light is lit. Modern furnaces might have electronic ignitions, which may need resetting.
2. Weak or No Airflow
- Check the Air Filter: A clogged filter can restrict airflow. Replace the filter if it’s dirty.
- Inspect the Blower Motor: Ensure the blower motor is functioning. Listen for unusual sounds or inspect the belt for damage.
- Blocked Vents: Make sure all supply and return vents are open and unobstructed.
3. Furnace Blowing Cold Air
- Thermostat Setting: Double-check that the thermostat is set to “Auto” and not “Fan.”
- Pilot Light or Ignition Issue: If the pilot light is out, relight it following the manufacturer’s instructions.
- Gas Supply: Ensure the gas valve is open and the supply is uninterrupted.
4. Frequent Cycling (Turns On and Off Repeatedly)
- Dirty Air Filter: Replace if clogged.
- Thermostat Placement: Ensure the thermostat is not placed near a heat source, as this can cause incorrect temperature readings.
- Overheating: A clogged filter or dirty blower wheel might cause the system to overheat and shut down as a safety precaution.
5. Strange Noises
- Rattling: Check for loose panels or screws and tighten them.
- Squealing: This might indicate a worn-out blower belt or motor bearings needing lubrication or replacement.
- Banging: Could signal a delayed ignition or ductwork expansion; consider professional inspection.
6. Furnace Leaking Water
- Condensate Line Blockage: Ensure the condensate drain line is clear and unclog it if necessary.
- Clogged Drain Pan: Check and empty the drain pan if it’s full.
- Condensing Furnace Issues: Inspect the exhaust vent or condensate pump for malfunctions.
7. Furnace Not Producing Enough Heat
- Thermostat Calibration: Ensure the thermostat is accurate and functioning correctly.
- Dirty Burner or Heat Exchanger: Clean these components carefully or schedule professional maintenance.
- Ductwork Issues: Check for leaks or blockages in the duct system.
When to Call a Professional
If troubleshooting doesn’t resolve the issue or if you notice signs of a more serious problem (e.g., gas smells, persistent leaks, or electrical issues), contact a certified HVAC technician immediately.
Regular maintenance and timely filter replacements can prevent many of these common issues!
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See What Our Customers Are Saying:
Dec 6, 2017
Received a new range and needed someone to disconnect the old range and connect the new gas range. They did a thorough job and were kind enough to remove the old range from the house. Thank you!
Dec 4, 2017
Very satisfied with this company! Salesperson Dave was very good, very knowledgeable and gave me the impression that he wanted to sell me what I needed rather than what would put the most money in the company's pocket. He also called back after the installation to see if I was satisfied with the result. The installation crew of Greg, Grant and Peter did a great job. They arrived on time, completed the job quickly, answered all my questions and thoroughly cleaned up. They told me to call if I had any further questions. They left me with the impression that they really cared about their work and my satisfaction and that it wasn't " just a job". Prior to researching for a new furnace, I had never heard of this company but I'm glad that I did and would highly recommend them to anyone looking for a new furnace or air conditioning unit. They may be small but they do a great job!!
Nov 7, 2017
I first met Greg and Grant (The Twin Brothers from Twin Tech - yup -it's not just a cool company name) back in 2014 when our furnace broke down and they installed our Carrier Furnace and AC that we purchased through Sears. I liked them instantly when I met them due to their friendly and professional service, and the fact that they didn't mind taking a little extra time to explain things in terms I could understand. Since that time they have reached out to me at least once a year to ensure that everything was running smoothly with my system and to keep me appraised of their evolving services. Due to this high level of proactive customer service I didn't hesitate to call and obtain their help for a Gas Stove removal and installation. When I scheduled the call Greg and Grant let me know that they would arrive the morning of the appliance delivery to disconnect the old gas stove, and then return in the afternoon to connect the new stove. Sure enough, they did just that as promised. Where they exceeded my expectations is with the extra level of support helping to assemble the burners and grills on the stove and in the oven. This may seem like a small thing to some but to my wife who was at home during this entire process it meant a stress free transition to the meal prep for the day. When I called home to ask about the install she commented that, "they left the place cleaner than it was when they arrived and they setup all the grills on top of the stove and in the oven... they didn't have to do all that -Wow!". You know what they say, Happy Wife, Happy Life. So in summary, I am recommending Twintech Heating & Cooling for all of your Furnace, Air Conditioning, and Gas Line needs. I've even called on these guys to help swap out a leaky water valve. They are just so easy to reach and communicate with by phone, and they don't mind a text message to confirm the details. You can rest easy when you have the Twins on your side as an extension of your household maintenance plan.
Oct 19, 2017
First thing, they actually showed up for a quote. Other big name companies in the area didn't even return my call , job was done as expected and new equipment is quiet and installed very clean and professional. Would highly recommend these guys.
Oct 17, 2017
They removed our old furnace and replaced it with a new furnace and AC system.
Sep 28, 2017
Work was performed in a clean and timely manner. The furnace and metal work was performed by the Twintech team (did not require separate contractor to do the metal work). Energy audit was arranged and promised rebates were received. The overall price was very competitive. We have recommended Twintech to several of our friends and family. Awesome job.
Sep 20, 2017
Grant and Greg installed a heating and AC system in our new Linwood post and beam home. Post and beam can be challenging structures for running ductwork and their high ceilings and open concept frequently frustrate efforts at balancing air flow and controlling temperatures. But these guys did it and did it right the first time. Even the building inspector was impressed with what he saw. More importantly, the boys brought a high degree of trust and integrity to the job. Something in short supply these days.
Sep 13, 2017
Very polite and professional. They removed my o
ld furnace and A/C and installed my new ones. They were efficient and thoroughly cleaned up when they were done! I would highly recommend them!
Sep 13, 2017
Pro from start to finish. They were able to fix my gas fireplace at very little cost as well.
Aug 8, 2017
Excellent installation very knowledgeable gentlemen! Would highly recommend them to all my friends for any hvac work !
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