Every time your thermostat calls for heat, the furnace runs a fixed checklist. The inducer motor starts and proves draft by closing a pressure switch, the hot surface igniter heats up, the gas valve opens, the burners light, and the flame sensor confirms there is fire. Only after all of that does the blower start pushing warm air into the house. Finding the step that fails is most of the job. Around Lee's Summit, MO, the usual failure points are a flame sensor fouled with oxide, an igniter cracked by years of heating and cooling, a pressure switch that stays open because of a weak inducer or a clogged condensate trap on a high-efficiency unit, and control boards with burned relays. Each one halts the startup, and from the hallway they all look alike.
Rather than guess, Lee's Summit HVAC tests the sequence stage by stage. We read igniter resistance, measure flame signal in microamps, check that the pressure switch responds to real inducer draft, confirm voltage at the gas valve, and test the blower and its capacitor. Because this is a fuel-burning appliance, the safety basics come with every visit: we inspect the heat exchanger, leak-test the gas connections, and verify flue draft. You cannot tell a furnace problem from a furnace hazard by looking at the thermostat. Before we leave, temperature rise is measured against the data plate so airflow and flame are matched as the manufacturer intended.
Conventional or condensing, gas, propane, or electric, we work on them all, across every major brand, including the traps, drains, and dual pressure switches that come with high-efficiency models. The parts most likely to fail are stocked on every truck: igniters, flame sensors, pressure switches, capacitors, inducer assemblies, and blower motors. That is why most repairs are finished in a single trip. If your furnace is down anywhere in Lee's Summit, call (816) 208-0710 and help will be headed your way today.
When the AC quits in summer, see AC Repair in Lee's Summit.
How Much Does Furnace Repair Cost in Lee's Summit?
For most Lee's Summit homes, a furnace repair runs $150 to $600. Cleaning a flame sensor is a small job; replacing a blower motor or control board is a bigger one. You'll get a written, upfront price from Lee's Summit HVAC after we diagnose the problem.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Flame sensor cleaning or replacementBurners light but cut out almost immediately | $80–$250 | Furnace lights, then shuts off within seconds |
| Hot surface igniter replacementFurnace clicks and tries to start but never lights | $150–$400 | No ignition; one of the most common winter failures |
| Draft inducer motorLoud humming or grinding at startup, then lockout | $400–$1,000 | Loud humming or grinding at startup, then lockout |
| Blower motorBurners run but little or no air comes out of the vents | $400–$1,500 | Burners run but little or no air comes out of the vents |
| Control boardErratic behavior, error codes, or no response at all | $300–$700 | Erratic behavior, error codes, or no response at all |
| Gas valve replacementValve fails to open, so the furnace never lights | $250–$700 | Valve fails to open, so the furnace never lights |
These are common price ranges, not quotes. We confirm the exact price after diagnosing your system.
What Affects the Price
- Furnace age and type, because 90%+ efficiency models have more specialized parts
- Whether a cracked heat exchanger is found, which usually means replacement rather than repair
- Same-day or after-hours service versus a planned visit
- Access to the furnace in attics, closets, or crawlspaces
For older furnaces facing a big repair, we'll show you what replacement would cost too, so you can compare. No heat right now? Call (816) 208-0710.
When to Call for Furnace Repair in Lee's Summit
Recognizing the warning signs early can save you time, money, and prevent significant damage to your property. These are the signals our technicians see most often when a problem is underway:
- A pilot or burner flame that is lazy yellow instead of crisp blue
- A furnace that shuts off every few minutes before the house warms up
- Flames that start, last a few seconds, and go out again and again
- A bang or boom when the burners ignite late
- Water, rust stains, or black soot around the flue or cabinet
- Squealing or grinding from the blower compartment
- The furnace clicks and glows but the burners never light
- Air moving through the vents that never gets warm
Early Action Saves Money
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. If you notice any of these signs, contact Lee's Summit HVAC at (816) 208-0710 for a prompt inspection.
Furnace Repair Issues? We Can Help.
Our experienced technicians are standing by to help.
Get Help: (816) 208-0710Furnace Repair FAQ
Why Professional Furnace Repair Matters
Gas, open flame, high voltage, and a flue all share one cabinet in a furnace, and the most dangerous failure is the one you cannot see: a damaged heat exchanger that lets combustion gases into the air the blower sends through your home. Every morning that delayed ignition keeps booming at startup, that exchanger takes more stress. The diagnostic side has its own pitfalls. When a furnace trips its high limit, the switch itself may be bad, or the furnace may be protecting itself from a clogged filter or a failing blower. Swapping the switch in that second case removes a safety device and leaves the actual problem in place.
Our experienced technicians treat every symptom as a question about the whole system. Flame signal gets measured rather than assumed, so a healthy sensor is never replaced while a cracked igniter or weak gas valve skates by. Draft is verified at the pressure switch and the flue. Temperature rise is checked against the data plate, which is how airflow problems get caught before they shorten the exchanger's life. And the gas side is leak-tested with instruments, not a sniff and a shrug. The result is a furnace that has been proven safe and correct under a full cycle, and an honest report if the unit is nearing the point where replacement beats another repair.
What to Expect From Our Furnace Repair
Our systematic workflow delivers thorough, lasting results on every job. Here's how we handle furnace repair from start to finish:
Sequence Diagnosis
We watch the furnace's startup sequence and measure at every stage: inducer draft, pressure switch, igniter resistance, flame signal, and gas valve operation, to find exactly where it breaks.
Safety Verification
Every repair includes a safety check: heat exchanger inspection, instrument leak testing on the gas side, and flue draft verification, because a furnace that runs is not the same as a furnace that runs safely.
Expert Repair
Most furnace repairs finish in one trip. The common failure parts, from igniters and flame sensors to pressure switches, capacitors, and motors, are stocked on the truck and ready to go.
Final Cycle Testing
We run complete cycles, measure temperature rise against the data plate, confirm clean ignition without booming, and verify every limit and safety control before we leave.
Furnace Repair Prevention Tips
A few simple habits now, like regular filter changes and seasonal tune-ups, can add years to your system's life. Here are our expert recommendations:
- Test your CO detectors monthly and make sure each floor has one
- Put in a fresh filter monthly through the heating season, the cheapest protection your furnace can get
- On high-efficiency models, keep the condensate trap and drain line clear and draining
- Schedule service each fall to catch worn igniters and dirty sensors before cold weather arrives
- Keep storage, lint, and especially chlorine-based products away from the furnace closet
- Listen at light-off; clean ignition is quiet, and booming means the burners need service
- Avoid packing the utility room, because burners need open space for combustion air
Comparing DIY and Professional Furnace Repair
While some minor tasks like changing filters or checking a thermostat can be handled by homeowners, most HVAC work involves refrigerant, gas combustion, and high-voltage electricity, jobs that call for professional expertise. Consider the following comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Heat Exchanger | Damage hidden inside the cabinet | Checked every time we open the unit |
| Ignition Faults | Guesswork based on blink codes | Each ignition component tested |
| Gas Connections | Small leaks missed entirely | Instrument leak test on each visit |
| High-Limit Trips | Safety switch bypassed or swapped | Root cause of overheating corrected |
| Blower Setup | Fan speed never checked | Rise measured and blower adjusted |
| Verification | Declared fixed after one flame | Full cycles proven clean and safe |
Schedule Your Furnace Repair Service
Get your comfort back before a small fault becomes a full breakdown. Lee's Summit HVAC is ready to respond fast.
Call (816) 208-0710 NowWhere We Provide Furnace Repair
We serve Lee's Summit and its neighboring communities for furnace repair, from quick same-day repairs to planned installs.