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 begin sending warm air into the house. Finding the step that fails is most of the job. Around Mission, TX, the usual failure points are an oxide-coated flame sensor, 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. Any one of them halts the startup, and from the hallway they all look alike.
Rather than guess, Mission HVAC tests the sequence one stage at a time. 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: the heat exchanger gets inspected, gas connections get leak-tested, and draft gets verified. 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.
Mission HVAC services natural gas, propane, and electric furnaces of every major brand, from standard 80 percent units to condensing high-efficiency models with their traps, drain lines, and dual pressure switches. Our trucks carry the parts that really fail, such as igniters, flame sensors, pressure switches, capacitors, inducer assemblies, and blower motors, so a typical no-heat call ends with the house warming up. Call (956) 253-1451 for furnace repair anywhere in Mission, and an experienced technician will be on the way today.
Cooling trouble instead? See AC Repair in Mission.
How Much Does Furnace Repair Cost in Mission?
For most Mission homes, a furnace repair runs $150 to $600. Ignition and sensor problems are usually the least expensive, while blower motors, control boards, and heat exchangers cost more. Mission HVAC tests the system, finds the actual fault, and quotes the repair before any work begins.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Flame sensor cleaning or replacementFurnace lights, then shuts off within seconds | $80–$250 | Furnace lights, then shuts off within seconds |
| Hot surface igniter replacementNo ignition; one of the most common winter failures | $150–$400 | No ignition; one of the most common winter failures |
| Draft inducer motorLoud humming or grinding at startup, then lockout | $400–$1,000 | Startup fan fails, furnace won't fire |
| Blower motorNo airflow, or the blower runs nonstop | $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 | Igniter glows but gas never flows to the burners |
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
- Timing, such as a no-heat call on a cold night versus a scheduled repair
- How easy the furnace is to reach
If your furnace is past 15 to 20 years old or the repair is a major one, we'll give you repair and replacement prices side by side. Call (956) 253-1451 to get your price.
Signs You Need Furnace Repair in Mission
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:
- Air moving through the vents that never gets warm
- Frequent on-off cycling that never reaches the thermostat setting
- Grinding or high-pitched squeals from the blower
- Burners light, run a few seconds, then shut down repeatedly
- A bang or boom when the burners ignite late
- Clicking and a glowing igniter with no burner flame
- A flame that burns soft and yellow rather than steady blue
- Water, rust stains, or black soot around the flue or cabinet
Don't Wait for a Total Failure
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. Call Mission HVAC at (956) 253-1451 at the first sign of trouble.
Furnace Repair FAQ
The Benefits of Professional Furnace Repair
A furnace combines gas, flame, high voltage, and a flue in one cabinet, and the failure that matters most is the one you cannot see from outside: a compromised heat exchanger passing combustion gases into the air your blower pushes through the house. Delayed ignition that booms at light-off stresses that exchanger further every morning it goes unfixed. Meanwhile the diagnostic traps stack up: a furnace that trips its high limit may have a bad switch, or it may be protecting itself from a clogged filter or a dying blower, and replacing the switch in the second case just removes a safety while leaving the fault.
Our techs look at every symptom in the context of the whole furnace. We measure flame signal instead of assuming it, which keeps us from replacing a healthy sensor while a cracked igniter or weak gas valve goes unnoticed. Draft is confirmed at the pressure switch and at the flue. Temperature rise is checked against the data plate, so airflow issues are caught before they cut years off the heat exchanger. The gas side is leak-tested with instruments, never with a quick sniff. What you get is a furnace proven safe over a full cycle, plus an honest opinion if the unit is getting close to the point where replacing it beats repairing it again.
How Our Furnace Repair Works
We follow a proven process to ensure every repair and installation is completed to the highest standards. Here's what you can expect when you choose Mission HVAC:
Step-by-Step 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 Inspection
The heat exchanger is inspected, gas connections are leak-tested, and flue draft verified on every visit. A furnace repair that is not proven safe is not finished.
Expert Repair
Igniters, flame sensors, pressure switches, capacitors, and motors ride on the truck, so most furnaces are lit and heating again before we pack up.
Final Cycle Testing
Before we leave, the furnace runs full cycles while we check temperature rise against the data plate, listen for clean, quiet ignition, and test each limit and safety control.
Maintenance Tips for Furnace Repair
Taking preventive measures can help you avoid costly heating and cooling problems down the road. Here are our expert recommendations:
- Avoid packing the utility room, because burners need open space for combustion air
- Book a fall tune-up so weak igniters and fouled sensors are caught before the first freeze
- Keep a working carbon monoxide alarm on every level of the home and check it each month
- Put in a fresh filter monthly through the heating season, the cheapest protection your furnace can get
- Keep the condensate trap and drain clear on high-efficiency units to prevent lockouts
- Store laundry supplies, especially chlorine products, well away from the furnace closet
- Pay attention when the burners light, since a boom instead of a soft whoosh calls for service
Comparing DIY and Professional Furnace Repair
Some simple checks are suitable for DIY, but most heating and cooling repairs benefit from professional tools, training, and experience. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Heat Exchanger | Damage hidden inside the cabinet | Examined as standard on each call |
| Ignition Faults | Guesswork based on blink codes | Igniter, sensor, and valve each metered |
| Gas Safety | Connections judged by smell | Connections leak-tested with instruments |
| High-Limit Trips | Safety switch bypassed or swapped | Filter, blower, and ducts checked for the cause |
| Airflow Match | Fan speed never checked | Rise measured and blower adjusted |
| Verification | It lit once, call it fixed | Complete cycles tested before we leave |
Talk to a Furnace Repair Expert
Don't let a failing system get worse. Call Mission HVAC now for prompt, professional service.
Call (956) 253-1451 TodayWhere We Provide Furnace Repair
Our technicians handle furnace repair throughout Mission and the surrounding communities, with the same upfront pricing everywhere we work.