Igniter and Flame Sensor Repair
When burners will not light or shut off a moment after lighting, the igniter or flame sensor is often involved. We test each part, clean or replace what has failed and confirm a steady flame.
FURNACE REPAIR
Furnace Repair in Pueblo, CO
When your furnace will not start, blows cool air or shuts off before the house warms up, Fesmire Heating & Air Conditioning finds the actual fault before recommending a repair. We are a second-generation, family-owned and operated company based in Pueblo, proudly serving homeowners in Pueblo, Pueblo West and surrounding Southern Colorado towns, with 25+ years of service behind our work. As an Armstrong Air ProTeam contractor, we repair any brand of furnace. You get a plain explanation of what failed, your options and clear next steps before any work begins.
Call Now 719-240-5109Business hours: Monday – Friday, 7am – 4pm
- 25+ Years of Experience
- Family-Owned & Operated
- Second-Generation
- Armstrong Air ProTeam
- We Service Any Brand
WHY FESMIRE
Why Pueblo Homeowners Call Our Furnace Repair Company
A furnace that stops heating can have many different causes, from a dirty flame sensor to a failed control board. We trace the fault with testing instead of swapping parts and hoping, which helps you avoid paying for repairs the furnace never needed.
Fesmire began as a father's company and is now run by his son. When your furnace breaks down, you deal with the people who answer personally for the diagnosis and the fix, and that second-generation accountability keeps our recommendations honest. Our company story shows where we came from.
As an Armstrong Air ProTeam contractor, we know Armstrong Air and York furnaces well, yet a repair never depends on the nameplate. We service any brand, including furnaces another contractor installed or that came with the house.
A furnace burns fuel and sends combustion gases out of your home, so a repair visit is about more than getting the blower running again. We look at the burners, venting and heat exchanger area as part of the diagnosis, and we tell you plainly if something affects safety.
We put the needs of our customers first and work with you every step of the way. You hear what failed, what the repair involves and what your options are, and nothing begins until the plan makes sense to you.
Fesmire has been installing and servicing heating and cooling equipment since 2000. Veterans and seniors receive 10% off when they mention it, and our Specials & Coupons page explains how it works.
WARNING SIGNS
Signs Your Furnace Needs a Repair Visit
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The Furnace Runs but the House Stays Cold
If you hear the furnace running and feel little warmth, heat is not reaching your rooms the way it should. A failing blower, a clogged filter, a tripped limit switch or a fault on the burner side can each cause it. These problems call for different repairs, so testing matters more than guessing. Check that the filter is not clogged, then give us a call.
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The Furnace Will Not Start or Light
A furnace that stays silent when the thermostat calls for heat may be missing power, a signal or a working ignition. On a gas furnace, a failed igniter, a dirty flame sensor, a stuck gas valve or a tripped safety switch can keep the burners from lighting. Confirm the thermostat is set to heat and the furnace switch is on before you call.
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Cycling On and Off Without Finishing a Heat Cycle
A furnace that starts, runs briefly and shuts down again is telling you something is wrong. Restricted airflow, a flame sensor that cannot confirm the flame, a worn limit switch or a venting problem are common culprits. Short cycling wears the system and leaves rooms cold, so it deserves a proper diagnosis instead of repeated resets.
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Banging, Squealing or Rattling From the Cabinet
A soft click as the burners ignite is normal. A bang at startup, a squeal from the blower or a rattle in the cabinet is not. Delayed ignition, worn motor bearings, a loose blower wheel or a failing inducer motor can each produce a distinct sound, so turn the system off if the noise is harsh and call us.
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Yellow Flame, Soot or an Unusual Smell
A gas burner flame is normally steady and blue, so a yellow or flickering flame, soot around the furnace or a persistent burning odor deserves attention. These signs can point to combustion, venting or heat exchanger trouble. Keep working carbon monoxide detectors in your home, and if one alarms, get everyone outside first. If you smell gas, leave the house and call your gas utility from outside.
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Uneven Heat, Weak Airflow or Climbing Heating Bills
Rooms that never warm up, weak air at the registers or a heating bill that rises with no change in how you use your home can all signal a struggling furnace. A tired blower motor, a clogged filter, dirty burners or duct connection problems may be behind it. We trace where the heat is being lost before suggesting any repair.
Furnaces work hardest through our cold Southern Colorado winters, and regular furnace maintenance through our residential maintenance plan helps catch these problems before the heating season is underway.
OUR REPAIR PROCESS
How We Trace a Furnace Fault From Thermostat to Vent
1. Listen to the Symptoms and Check the Basics
What your furnace did before it failed is often the best clue, so we start with your description and the simple items that cause more service calls than most people expect.
- Ask what you saw, heard and smelled, and when the trouble began
- Learn whether the problem comes and goes or stays constant
- Confirm the thermostat setting, the furnace switch and the breaker
- Note any blinking indicator light or fault code on the control board
- Record the brand and model from the data label inside the cabinet
2. Inspect the Burners, Ignition and Venting
A furnace has a combustion side and an airflow side, and a fault on either one can stop the heat. We look at the combustion side first because it is also where safety matters most.
- Examine the igniter, flame sensor and burners for soot, corrosion or buildup
- Watch the ignition sequence and note anything that stalls, repeats or shuts down
- Inspect the flue pipe and venting for gaps, blockage or damage
- Look over the heat exchanger area for visible cracks or signs of overheating
- Check the gas connection and valve for visible problems
3. Test the Blower, Controls and Safety Switches
Even when the flame lights, the furnace has to move heat through your home and shut itself down if something goes wrong. We test the parts responsible for both jobs.
- Measure voltage and amperage on the blower and inducer motors
- Test capacitors, relays and the control board for correct operation
- Confirm the limit and pressure switches open and close as designed
- Inspect the air filter, blower wheel and cabinet for dirt or restriction
- Verify that the thermostat signal reaches the furnace
4. Pinpoint the Failure and Review Your Options
Once the cause is clear, we explain it in everyday language and let you decide how to proceed.
- Name the failed part and explain how it produced the symptoms you noticed
- Describe what the repair involves and what to expect if the problem is left alone
- Point out anything we found that affects safety
- Lay out repair and replacement options honestly when both are reasonable
- Provide a clear, itemized quote for the work you choose before anything begins
5. Repair, Run Full Heat Cycles and Document the Results
We finish by proving the repair worked under real operating conditions and leaving you with a record of what was done.
- Repair or replace the failed part and secure every electrical and gas connection
- Run the furnace through complete heating cycles and watch the full ignition sequence
- Record the final test readings so the furnace's operation is documented
- Clean the work area and remove the old parts
- Give you a written summary of what we found, what we did and what we recommend going forward
Tell us what your system is doing.
Call us and we’ll start with step one.
719-240-5109Business hours: Monday – Friday, 7am – 4pm
REPAIRS WE HANDLE
Furnace Problems We Diagnose and Fix
Gas Valve and Burner Service
A valve that sticks or burners that fire unevenly can leave you with weak heat or none. We diagnose the gas train carefully and repair or replace only what testing shows has failed.
Blower Motor and Capacitor Repair
The blower moves heat through your ducts, and a worn motor or failed capacitor can leave the house cold even while the burners run. We test the motor, its capacitor and the blower wheel.
Control Board Repair
The control board runs the furnace's ignition and safety sequence. When it misbehaves, we trace the fault with testing instead of guessing, then repair or replace the board.
Limit Switch and Overheating Repair
A limit switch shuts the furnace down when it runs too hot, and a tripped one signals a deeper problem such as poor airflow. We find the cause and correct it.
Inducer Motor, Pressure Switch and Venting Repair
The inducer pulls combustion gases out through the vent, and the pressure switch confirms it is working. We test the motor, the switch and the vent path for faults and blockage.
Heat Exchanger Inspection and Findings
A damaged heat exchanger is a safety concern, so we inspect it carefully and explain exactly what we see. If it affects your decision, we lay out your repair and replacement options openly.
Thermostat and Low-Voltage Wiring Repair
A faulty thermostat or damaged control wiring can keep a healthy furnace from starting or from shutting off. We trace the signal path and repair the circuit.
Not sure which repair your system needs?
Call us and we’ll find the cause first.
719-240-5109Business hours: Monday – Friday, 7am – 4pm
Customer Reviews
Read Reviews of Fesmire on Google (opens in a new tab)
What Pueblo Homeowners Say About Fesmire Heating & Air Conditioning
The best measure of our work is what our neighbors in Pueblo and Pueblo West have to say about it. Read the reviews customers have shared on Google, or add your own after your visit.
COMMON QUESTIONS
Furnace Repair FAQs for Pueblo Homeowners
When a furnace runs without producing enough warmth, the cause is often a clogged filter, a failing blower, a tripped limit switch or a burner-side fault. Start by checking that the filter is clean and the thermostat is set to heat. If the air stays cool or lukewarm, switch the system off and call us at (719) 240-5109 so we can test it.
Short cycling usually means the furnace is protecting itself or cannot confirm that it is burning properly. Restricted airflow, a dirty flame sensor, an overheating limit switch, a venting problem or a thermostat fault can all cause it. Repeated resets can stress the equipment, so switch it off and let us find the cause. We explain what we find before any repair begins.
Confirm the thermostat is set to heat above room temperature, the furnace switch is on and the breaker has not tripped. If those are fine, the cause may be an igniter, flame sensor, control board or safety switch. Do not try to bypass safety controls. Leave the furnace off and call us Monday through Friday, 7am to 4pm, and we will diagnose it.
A gas burner flame is normally steady and blue, so a yellow or flickering flame, soot or a persistent burning smell can signal a combustion or venting problem. Treat it seriously. Keep working carbon monoxide detectors in your home. If one alarms, get everyone outside first, and if you smell gas, leave and call your gas utility from outside. After that, call us to inspect the furnace.
A bang at startup can point to delayed ignition, where gas builds up briefly before lighting, while squealing often comes from worn blower or inducer motor bearings or a slipping belt on older blowers. Rattling may be a loose panel or blower wheel. Turn the furnace off if the noise is harsh, because continued running can damage other parts, and call us to diagnose it.
Make sure the thermostat is set to heat with fresh batteries if it uses them, the air filter is clean, the furnace switch is on and the breaker has not tripped. Check that the registers are open and not blocked by furniture. If nothing helps, leave the furnace off and call (719) 240-5109 during business hours with what you noticed.
Yes. We service any brand of furnace, whoever installed it, including systems that came with the house. As an Armstrong Air ProTeam contractor we know Armstrong Air and York furnaces well, but the repair never depends on the badge. Share the make and model from the data label inside the cabinet when you call, and we will plan the visit around your equipment.
It depends on what failed and how the rest of the system is holding up. A single failed part on an otherwise sound furnace usually makes sense to repair, while repeated breakdowns or a cracked heat exchanger may point toward replacement. We explain both paths honestly and let you decide. If replacement is the better path, we also handle furnace installation.
Yes. We provide heating, air conditioning and heat pump service for mobile and modular homes, including their furnaces. These homes can have different equipment and space considerations than a site-built house, so we confirm what you have before recommending a repair. Our mobile and modular home HVAC page explains our approach, and you can call (719) 240-5109 to describe your setup.
Yes. In many homes the furnace blower also moves cooled air through the ducts, so a failing blower motor or capacitor can affect heating and cooling alike. We check the shared components when we diagnose your furnace. If your central air also needs attention, our air conditioning repair service covers it.
SERVICE AREA
Furnace Repair in Pueblo & Nearby Southern Colorado Towns
Fesmire is based in Pueblo, and our main service area is Pueblo and Pueblo West. We repair furnaces for homeowners in the communities below, and you can see every town we cover on our Service Areas page.
Primary Service Cities
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Pueblo, CO Our home base, where we diagnose and repair furnaces of any brand for local homeowners. -
Pueblo West, CO Part of our main service area, alongside Pueblo, with the same furnace repair service. -
Avondale, CO Furnace diagnosis and repair for Avondale homeowners, on any brand of system.
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Colorado City, CO Heating repairs for Colorado City homes, from ignition problems to blower faults. -
Walsenburg, CO Furnace repair for Walsenburg homeowners, with options explained before work begins. -
Florence, CO Furnace repair for Florence residents.
Also serving
Fowler, CO Greenhorn Valley, CO Rye, CO Rocky Ford, CO Manzanola, CO Westcliffe, CO Trinidad, CO Beulah, CO
Don’t See Your Location?
Not sure if we serve your area? Call us at 719-240-5109 — we're happy to let you know.
719-240-5109
Save on Service
Veteran & Senior Discounts in Pueblo, CO
Those who served and those who’ve earned their rest deserve a break. Mention it when you call or schedule, and we’ll take 10% off your service.
Veteran & Senior Discount
10% Off When You Mention It
Cannot be combined with any other offer.
719-240-5109
RELATED SERVICES
More Ways We Keep Your Home Comfortable
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Air Conditioning Services
Central air repaired, maintained and installed, so the same company keeps you comfortable through summer.
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Heat Pump Services
Ducted heat pumps that heat and cool through your existing ductwork, for homeowners weighing their options.
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Mini-Split Services
Ductless systems suit additions, garages and rooms your furnace and ducts do not reach well, and we service LG and other brands.
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Package Unit Services
Heating and cooling in one outdoor cabinet, repaired, maintained and replaced for residential properties.
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Indoor Air Quality
Honeywell air cleaners, humidifiers and dehumidifiers that help improve the comfort of the air inside your home.
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Call Us Now
Not sure which service you need? Call us and we’ll help you find the right next step for your system.
GET SCHEDULED
A Pueblo Heating Contractor That Repairs With Straight Answers
When your furnace stops heating the way it should, you want a repair contractor who finds the real cause and tells you plainly what it found. Fesmire Heating & Air Conditioning has been installing and servicing heating and cooling equipment since 2000, and as a second-generation, family-owned and operated company, we put the needs of our customers first. You deal with the people who answer for the work, and every repair begins with a conversation about what your furnace has been doing. Furnaces take real wear through a Southern Colorado winter, so we treat each visit as a chance to tell you the condition of the whole system.
Here is what to expect when you call. We listen to the symptoms, inspect the burners, venting and airflow side of the furnace, test the controls and explain the cause in everyday language. You hear your options before any repair begins, there are no surprises or hidden fees and the decision is always yours. We repair any brand, from Armstrong Air and York furnaces to the equipment already in your home. When the work is done, you receive a written summary of what we found and what we did, so you always know the condition of your system. Veterans and seniors receive 10% off when they mention it.
Not sure whether what you notice is a repair issue? Describe it to us, whether it appeared this week or has been building all season. Our residential maintenance plan is built around heating and cooling tune-ups, our furnace services overview covers everything we do for heating systems, and you can browse all of our heating and cooling services if you need help beyond a furnace repair. Call (719) 240-5109 Monday through Friday from 7am to 4pm, and we will get you scheduled. We serve homeowners across Pueblo, Pueblo West and the surrounding Southern Colorado towns.
719-240-5109- 25+ Years of Experience
- Family-Owned & Operated
- Second-Generation
- Armstrong Air ProTeam
- We Service Any Brand