Furnace Repair in Lexington, SC

A furnace in Lexington might go eight months without lighting once. When the first real cold front arrives, that long rest shows up as a cracked ignitor, a flame sensor coated in residue, or a pressure switch hose full of water. Furnace repair in Lexington, SC is mostly about finding which step in the startup sequence is failing, then fixing that part without guessing.

We repair natural gas, propane and electric furnaces, in closets, garages, attics and crawlspaces, for homes and small commercial spaces. A repair visit covers:

• Reading the fault code and testing the full startup sequence
• Ignitors, flame sensors, inducer motors, pressure switches and gas valves
• Blower motors, capacitors, high-limit and rollout switches
• Control boards, transformers and thermostat wiring
• Electric elements, sequencers and relays
• A CO reading and vent check before we leave

The goal is one confirmed cause and one fix, not a box of parts swapped until the burners stay lit.

Furnace not turning on, or blowing cold air?

Match what you're seeing to the likely cause. It won't replace a diagnosis, but it tells you how urgent the problem is.

Why Midlands furnaces fail when the cold arrives

A long idle season is hard on parts that are built to cycle. Dust settles on the burners, spiders and wasps move into the inducer and burner tubes, and the hot surface ignitor, which is brittle ceramic, can crack the first time it heats up in months.

Summer causes its own damage. In an upflow system the air conditioning coil sits right on top of the furnace. If its drain pan clogged or overflowed in July, water may have been dripping onto the burners and controls all summer, and you only find out when the heat won't light. Lightning and power surges from summer storms can damage a furnace control board in August that nobody notices until November. Crawlspace furnaces add rodent-chewed wiring to the list, and a filter loaded with spring pine pollen can make any furnace overheat and shut itself down.

How we diagnose a furnace, step by step

Every gas furnace runs the same sequence of operation, so we test it in order and stop where it breaks.

1. Read the fault code and the history

Most furnaces made in the last few decades flash a code on the control board. We read it before resetting anything, then ask what you noticed and when.

2. Inducer and pressure switch

The inducer motor clears the heat exchanger of old combustion gas. The pressure switch confirms it is drafting. A seized inducer, a cracked hose or a blocked condensate trap on a high-efficiency furnace stops everything here.

3. Ignition and flame proving

We test the ignitor's resistance, watch it glow, confirm the gas valve opens, and check that the flame sensor proves the flame. A sensor with a thin oxide film is a common reason a furnace lights and then quits a few seconds later.

4. Blower, limits and safety

We check blower motor amperage, the run capacitor, the high-limit and rollout switches, and filter and duct restrictions. Then we take a carbon monoxide reading and look at the vent connection.

Electric furnace repair

Electric furnaces skip the flame and use resistance elements switched by sequencers or relays. We meter each element and its control, check the breaker and wire connections for heat damage, and confirm the blower is moving enough air to keep the elements from overheating.

5. Price, repair, then several full cycles

You get the cause in plain words and the price before any part goes in. Common parts are often swapped on the same visit; discontinued ones can take days to arrive. Afterwards the furnace runs several complete heating cycles, we take a CO reading at the flue and clean up.

Common furnace repairs and the trade-offs

• Flame sensor. Cleaning often solves it. If the rod is pitted or the ceramic is cracked, replacing it costs little and saves a callback.
• Furnace ignitor replacement. We match the original where possible. A universal ignitor works on many models and gets you heat sooner when the original is back-ordered.
• Inducer motor or pressure switch. Replacing a switch without finding why it didn't close (a blocked vent, a clogged trap) just brings the problem back.
• Control board. If a surge caused the failure, ask about adding surge protection so the new board isn't next.
• Blower motor or capacitor. A capacitor is a quick fix; a failed motor can be replaced with a direct match or a compatible model.
• Cracked heat exchanger. This lets combustion gases mix with the house air. We will shut the gas off to the furnace, show you what we found, and talk through replacing the furnace. Patching is rarely a sound option.

What changes the price of a furnace repair?

No two no-heat calls cost the same, because the bill follows the part and the hours. The main variables:

• The part that failed, and whether it's stocked or must be ordered.
• The furnace's age and make; discontinued parts take longer to source.
• Where the unit sits: a hall closet is quicker than a cramped attic or a crawlspace.
• Secondary damage, such as rust from a dripping coil or wiring chewed by rodents.
• Time of day; after-hours and weekend calls cost more.
• Whether the fix needs a second trip, such as an ordered board or inducer.
• Root-cause work alongside the part: clearing a condensate trap, adding a surge protector or fixing the drain that rusted the burners.

If the house is already cold, our no-heat emergency service answers calls 24/7. To keep this from happening again next winter, a fall heating tune-up cleans the sensor and tests the ignitor before you need them. We cover West Columbia, Cayce, Oak Grove and the rest of Lexington County.

Gas code, permits and who should open a furnace

Furnace repair touches gas, flue gases and line voltage at once, which is why South Carolina requires HVAC contractors to be licensed through the Department of Labor, Licensing and Regulation (LLR). You can check any company's license on the LLR website before booking. Our company carries full licensing and insurance.

A like-for-like part swap rarely needs a permit. Replacing the furnace, moving gas piping or rerouting the vent usually does, and the Town of Lexington or Lexington County building department issues it under the fuel gas code the state adopts. Safety switches stay in the circuit: a jumpered rollout or pressure switch can let flame or exhaust go where it shouldn't.

Why call us when the furnace quits

You get the diagnosis from the person who runs the company. Chong Kim, the owner, still works the service calls himself, the company is NATE certified, and the habit reviewers notice is the same at a furnace as anywhere: show the reading, explain the options, let you choose, and leave no upsell behind. If the fix is cleaning a flame sensor, that is the fix you hear about. If the heat exchanger is cracked, you see the crack and get a free replacement estimate on Bryant equipment, sourced quickly. We call ahead, clean up after ourselves, and answer no-heat emergency calls 24/7.