Chattanooga winters bring cold nights in the valley and even colder temperatures on Signal Mountain and Lookout Mountain, and a furnace that fails in January needs attention quickly. One Source Heating, Cooling, Plumbing & Electrical provides furnace repair in Chattanooga, TN. Our NATE-certified technicians find the actual cause of the problem, check the system for safety, and explain your options and price before any work begins.
One Source has been in business since 1996. We never use subcontractors, our trucks carry common furnace parts so most repairs can be completed on the first visit, and repair service is available 24/7.
Signs Your Furnace Needs Repair
- The furnace will not start, or the blower runs but there is no heat
- Cold or lukewarm air from the vents
- The furnace turns on and off frequently
- Some rooms stay cold while others are warm
- Banging, rattling, squealing, or scraping noises
- A burning or electrical smell that lingers after the first startup of the season
- A yellow or flickering burner flame instead of a steady blue flame
- The thermostat calls for heat but nothing happens
- Gas or electric bills rising without a change in use
- Carbon monoxide alarms sounding
Furnace Safety First
If you smell natural gas, do not operate switches or appliances. Leave the home immediately and call your gas utility or 911 from a safe location. If a carbon monoxide alarm sounds, get everyone outside and call for help. Once the home is safe, our technicians can inspect and repair the furnace. Every home with gas appliances should have working carbon monoxide detectors.
Common Furnace Problems We Repair in Chattanooga
Ignitor and Flame Sensor Failures
A cracked hot surface ignitor or a dirty flame sensor is one of the most common reasons a gas furnace tries to start and then shuts off.
Dirty Filters and Overheating
A clogged filter restricts airflow, causing the furnace to overheat and shut down on its high-limit switch. Regular filter changes prevent many no-heat calls.
Inducer Motor and Pressure Switch Problems
The inducer motor clears combustion gases before the burners light, and the pressure switch confirms the venting is clear. Failures, blocked vents, or condensate problems can keep the furnace from starting.
Blower Motor and Capacitor Failures
The blower moves warm air through the ductwork. A failing motor or capacitor causes weak airflow, noise, or no heat at the vents.
Thermostat and Control Board Issues
Wiring problems, thermostat failures, and control board faults can look like a major failure. Proper diagnosis keeps you from paying for parts you do not need.
Cracked Heat Exchangers
The heat exchanger keeps combustion gases separate from the air you breathe. A crack can allow carbon monoxide into the home and is a serious safety concern that often means replacement is the safer choice.
Furnaces, Heat Pumps, and Dual-Fuel Systems in Chattanooga
Many Chattanooga-area homes heat with an electric heat pump, while others use a gas furnace or a dual-fuel system that pairs a heat pump with a gas furnace for the coldest days. We repair all of these systems. If your home uses a heat pump, see our heat pump services in Chattanooga. For other heating problems, see heating repair in Chattanooga.
What to Check Before You Call
- Thermostat: Make sure it is set to heat, the set temperature is above room temperature, and the batteries are good.
- Air filter: Replace a dirty filter.
- Power: Check the breaker and the service switch near the furnace.
- Furnace door: The blower compartment door must be fully closed for the safety switch to allow operation.
- Vents: Make sure supply and return vents are open and unblocked.
Do not attempt repairs on the gas valve, burners, or electrical controls. Those require a trained technician.
Our Furnace Repair Process
1. We Review the Symptoms
We start with what you are experiencing and any error codes shown on the furnace control board.
2. We Inspect and Diagnose
We check ignition, flame sensing, venting, airflow, electrical components, and controls, and we inspect the system for safety concerns.
3. We Explain Your Options and Price
You get a clear explanation of what failed and the repair cost before any work begins.
4. We Complete the Repair
With common parts on our trucks, most repairs are completed on the first visit.
5. We Test the System
We run the furnace through a full heating cycle to confirm safe, reliable operation.
Repair or Replace Your Furnace?
Repair is usually the right choice when the furnace is in good condition and a single component has failed. Replacement may be worth considering when:
- The furnace is roughly 15 to 20 years old or older
- The heat exchanger is cracked
- Repairs are becoming frequent or expensive
- Heating bills keep rising
- The home never feels evenly warm
We will give you an honest recommendation and help you compare the cost of a repair with the value of a new system. Today’s high-efficiency furnaces reach 90 to 98 percent AFUE, compared with much lower efficiency in older models. Learn more about furnace replacement and installation in Chattanooga, and ask about our financing options.
Prevent Breakdowns With Annual Maintenance
A tune-up before winter lets our technicians clean and test the ignition system, burners, flame sensor, and safety controls, check venting, and catch small problems before they turn into a no-heat call on the coldest night of the year.
Emergency Furnace Repair in Chattanooga
When the heat goes out on a freezing night, One Source provides 24/7 repair service. Learn more about our HVAC repair in Chattanooga.
Furnace Repair Throughout the Chattanooga Area
We provide furnace repair in Chattanooga and nearby communities, including Hixson, Red Bank, Signal Mountain, Lookout Mountain, East Ridge, Ooltewah, Collegedale, and Cleveland. See all of our Chattanooga heating and cooling services.
Why Chattanooga Homeowners Choose One Source
- In business since 1996
- NATE- and EPA-certified technicians
- We never hire subcontractors
- Fully stocked trucks so most repairs are completed the same day
- 24/7 repair service
- Work backed by our guarantee and a 100% satisfaction commitment
Schedule Furnace Repair in Chattanooga, TN
If your furnace is not heating, short cycling, or making unusual noises, contact One Source to schedule furnace repair in Chattanooga.
Frequently Asked Questions About Furnace Repair in Chattanooga
Why is my furnace blowing cold air?
Common causes include a thermostat set to fan instead of auto, a dirty flame sensor, a failed ignitor, a clogged filter causing the furnace to overheat, or a venting problem.
Why does my furnace keep turning on and off?
Short cycling is often caused by a dirty filter, overheating, a dirty flame sensor, a thermostat problem, or a furnace that is too large for the home.
How long does a furnace last?
Many gas furnaces last roughly 15 to 20 years with regular maintenance. Age, maintenance history, and repair frequency all affect whether repair or replacement makes more sense.
Is a cracked heat exchanger dangerous?
Yes. It can allow carbon monoxide to escape into the home. If one is found, the furnace should be shut down until it is repaired or replaced.
Do you repair heat pumps too?
Yes. We repair gas furnaces, electric heat pumps, and dual-fuel systems throughout the Chattanooga area.
Do you offer 24/7 furnace repair in Chattanooga?
Yes. One Source provides 24/7 repair service for urgent heating problems.
