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Carbon Monoxide Diagnosis & Combustion Safety
Carbon monoxide is the one chimney hazard you can't see, smell, or afford to guess about. We diagnose CO and combustion spillage with instruments — a combustion analyzer reading CO/O2/stack temp, a draft gauge, and a worst-case depressurization test that catches the spillage a calm-day check misses. Because that test looks at how the whole house — exhaust fans, HVAC, tight insulation — pulls on the flue, we're the right crew to both find the source and correct it, whether the fix is a tune, a draft correction, makeup air, or a flue resize. Then we re-measure to verify it; an unverified CO fix is just hope.
Duration
2–4 hours
Warranty
1-year workmanship
Standards
CSIA techs · NFPA 211 · IRC
Human reply
< 2 min
What is it
What is carbon monoxide diagnosis & combustion safety?
A carbon monoxide problem is the one chimney hazard you can't see, smell, or afford to guess about. When a CO detector alarms, when a flame burns wrong, or when a tight home starves an appliance of air, the difference between a real fix and a dangerous reassurance is whether someone measured it. Texas Service Experts diagnoses CO and combustion-spillage problems with instruments — combustion analyzers, draft gauges, and worst-case depressurization testing — and corrects the source, then verifies the fix by re-reading the numbers.
Measurement, not intuition, is what finds the cause — because CO comes from incomplete combustion and from flue gases spilling into the house instead of going up the chimney. We probe the appliance with a combustion analyzer to read CO, O2, and stack temperature, measure draft in inches of water column at the draft hood, and run a worst-case depressurization (BPI-style) test — closing doors and running exhaust fans to put the house at its most negative — to see whether the flue still drafts or spills under real-world conditions. A tight, exhaust-heavy modern home can pull combustion gases back down a chimney that tests fine on a calm day; only worst-case testing catches it.
With the mechanism identified, we correct it at the source. A mis-tuned appliance gets its burner tuned into spec. A flue spilling from a draft problem gets the draft fixed — resizing, a draft-inducer, or a height correction. A house depressurizing the combustion zone gets combustion air added or return leaks sealed. An oversized common flue orphaning a lone water heater after a furnace upgrade gets re-lined to the correct size. The fix matches the actual finding — not a parts-swap guess.
Re-verification is the non-negotiable final step. After the correction, we re-run the combustion and draft readings and re-test under worst-case conditions to confirm CO is in spec and the flue draws without spilling, then document the before-and-after numbers. We address detection, too: standard UL-2034 alarms only sound at 70 ppm and ignore the chronic 5–30 ppm exposure that causes long-term harm, so where appropriate we place low-level (7-ppm) monitors near combustion appliances and sleeping areas, and can wire a spillage interlock that shuts an appliance down on backdraft.
Common signs you need this service
- A CO detector has gone off, even with no one feeling any symptoms yet.
- A flame that burns wrong, or soot and odor showing up around a combustion appliance.
- Smoke or spillage that shows up only when the exhaust fans run or the doors get closed.
- A water heater that began backdrafting after a new high-efficiency furnace went in.
Every carbon monoxide diagnosis & combustion safety includes:
- Combustion-analyzer + draft-gauge readings at the appliance
- Worst-case (BPI-style) depressurization spillage test
- Source correction — tune, draft fix, makeup air, or flue resize
- Re-verified before/after numbers; low-level monitor + interlock options
Materials we use
Combustion AnalyzerDraft GaugeLow-Level (7-ppm) CO MonitorSpillage Interlock
Scoped from a graded inspection
With our crew, a carbon monoxide diagnosis & combustion safety is never guesswork. We scope every job from a graded, photographed inspection first — the NFPA 211 level the evidence calls for — so the work is matched to what your flue and masonry actually need, with the report to prove it. The documented inspection is the record the carbon monoxide diagnosis & combustion safety is built on.
Chimney inspectionBuilt to code
The code your carbon monoxide diagnosis & combustion safety has to meet.
A carbon monoxide diagnosis & combustion safety isn't a matter of opinion — it's held to published national standards. Texas Service builds every job to the named codes below and documents it, so the work is provably right for an inspector, an insurer, or a future buyer. These are the universal standards; your city's permit and inspection requirements are confirmed with the local authority before we pull the job.
NFPA 211NFPA 54UL-1777UL-103HTIRC
Worst-case depressurization (CAZ)
To confirm spillage, the house goes into worst-case depressurization per BPI combustion-safety practice, doors closed and every exhaust running, and we measure whether the combustion appliance zone still drafts.
Verified correction
After correcting the source, we re-run the worst-case test along with combustion and draft readings, proving CO sits in spec and the flue draws without spilling, then log the before/after numbers.
Low-level CO monitoring
Because standard UL-2034 alarms stay silent until 70 ppm, low-level (≈7-ppm) monitors go near appliances and sleeping areas to catch the chronic exposure those alarms miss.
Codes cited are the established national standards (NFPA, UL, IRC) that govern this service. The adopted code edition, permit, and inspection requirements vary by city —Texas Service verifies them with your local authority having jurisdiction on every job.
Our process
How a carbon monoxide diagnosis & combustion safety job runs.
01
Measure
Read CO, O2, and stack temp on a combustion analyzer, and measure draft right at the hood.
02
Stress-test
Run a worst-case depressurization test, doors closed and exhaust going, to force any spillage into view.
03
Correct the source
Tune the burner, correct the draft, add combustion air, or resize an orphaned flue, whichever the finding calls for.
04
Re-verify
Re-take the readings and rerun the worst-case test, document before and after, and set low-level monitors or an interlock if you want them.
Why choose us
Why DFW homeowners pick Texas Service for carbon monoxide diagnosis & combustion safety.
We've worked on 1,000+ DFW homes over 10+ years. Every job — small sweep or full rebuild — runs the same way: certified technicians, written quotes, photo reports, warranty in writing.
10+
Years experience
CSIA
Certified techs
23
Metros covered
A combustion analyzer reads CO, O2, and stack temp right at the appliance, so the numbers are measured rather than guessed.
Worst-case (BPI-style) depressurization test catches intermittent spillage
The fix is matched to what the finding shows, then re-checked against the same readings.
Low-level (7-ppm) monitor placement and spillage-interlock wiring available if you want the added protection.
Who we are
Texas Service Experts. 10+ years on DFW chimneys.
Family-owned, CSIA-certified, NFPA 211–compliant. We're the team you call when you want it done right the first time — no rotating subcontractors, no upsell pressure, no surprises. Same techs, same trucks, same standard.
CSIA Certified
Chimney Safety Institute of America
NFPA 211 Compliant
Code-compliant on every job
Owner on every job
Personal accountability, every time
1-year workmanship warranty
In writing, every job
Texas Service
DFW Metroplex · CSIA-Certified
NFPA 211
Code compliant
Carbon Monoxide Diagnosis & Combustion Safety by location
Dallas, TXFrisco, TXMcKinney, TXFort Worth, TXPlano, TXArlington, TXIrving, TXGarland, TXGrand Prairie, TXMesquite, TXRichardson, TXAllen, TXCarrollton, TXDenton, TXLewisville, TXFlower Mound, TXThe Colony, TXCoppell, TXGrapevine, TXSouthlake, TXColleyville, TXKeller, TXTrophy Club, TXWestlake, TXHighland Park, TXUniversity Park, TXAddison, TXFarmers Branch, TXDuncanville, TXDeSoto, TXCedar Hill, TXLancaster, TXRowlett, TXRockwall, TXWylie, TXSachse, TXMurphy, TXFairview, TXProsper, TXCelina, TXLittle Elm, TXArgyle, TXRoanoke, TXHaslet, TXNorth Richland Hills, TXHurst, TXEuless, TXBedford, TXWatauga, TXBurleson, TXMansfield, TXMidlothian, TXWaxahachie, TXEnnis, TXKaufman, TXTerrell, TXForney, TXHeath, TXFate, TXRhome, TXHouston, TXSugar Land, TXThe Woodlands, TXPearland, TXLeague City, TXConroe, TXMissouri City, TXAtascocita, TXKingwood, TXCypress, TXSpring, TXKaty, TXFriendswood, TXHumble, TXTomball, TXRichmond, TXAustin, TXRound Rock, TXCedar Park, TXGeorgetown, TXLeander, TXSan Marcos, TXPflugerville, TXKyle, TXHutto, TXLakeway, TXBuda, TXManor, TXBastrop, TXBee Cave, TXDripping Springs, TXSan Antonio, TXNew Braunfels, TXSchertz, TXCibolo, TXSeguin, TXConverse, TXBoerne, TXUniversal City, TXLive Oak, TXLeon Valley, TXFair Oaks Ranch, TXHelotes, TXAlamo Heights, TXFloresville, TXBulverde, TXGarden Ridge, TX
FAQ
Common questions about carbon monoxide diagnosis & combustion safety.
How often should I have my chimney swept?
The NFPA recommends a Level 1 inspection every year, with a sweep once buildup reaches 1/8" of creosote — for a wood fireplace you actually use, that's about once a heating season. The neighborly part: since we're already on the roof, the same crew checks your dryer vent and caps the visit with a quick whole-home safety look, so one appointment covers what would otherwise be three.
Are your technicians certified?
Yes — our inspectors hold current CSIA (Chimney Safety Institute of America) certifications, verifiable in the CSIA member directory at csia.org, and we have NFI specialists for fireplace work. The same trained crew handles your chimney, fireplace, dryer-vent and air-duct needs, so you're not juggling four different contractors for one house.
Do you offer emergency service?
Yes — 24/7 response (subject to crew availability) for active leaks, an animal trapped in the flue, post-fire damage, and storm damage, same-day in most cases. One call reaches one crew that can handle whatever the situation turns out to need, instead of bouncing you between specialists while the water's still coming in.
Do you provide written quotes before work begins?
Always — a written quote before we lift a tool, with photos of what we found, so you see exactly what you're approving. If the same visit turns up something in the dryer vent or ducts, it goes on one itemized quote and one invoice rather than a string of separate trips.
What's the Whole-Home Care Plan membership?
The Whole-Home Care Plan is our annual maintenance plan at $19.99/month ($240/year): a Level 1 inspection and sweep ($248 value), priority scheduling, 10% off all repairs, and emergency-response priority. Because one crew covers chimney, fireplace, dryer-vent and ducts, the plan keeps the whole house on a single schedule instead of a calendar full of separate service calls. Cancel anytime, no contract.
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10+
Years
NFPA 211
Standard
CSIA
Certified
< 2hr
Response
Ready when you are
Talk to a CSIA-certified expert today.
Free written quote. Same-week scheduling. 24/7 emergency response when you need it.
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Emergency
24/7 Response
Active leak, animal in flue, post-fire damage, or smoke event? Real humans on the line 7 AM to 12 AM every day — replies in under 2 minutes. Tech dispatch within 2 hours during business hours, subject to crew availability after-hours.
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