Gas Fireplace & Insert Emergency

Emergency Chimney Service
Overbrook, Greenville SC

Gas smell, yellow or orange flames, CO detector alarm, or smoke from a gas insert — gas appliance emergencies involving the venting system require the right response. Know what the warning signs mean and when to stop use immediately.

Gas Odor Response Abnormal Flame Color Gas Insert Venting Mon–Sat Service
Call Now — (864) 794-6932
Severity by Symptom — Gas Fireplace Warning Signs Ranked

Gas Fireplace & Insert Symptoms — What Each One Requires

Gas appliance warning signs range from true emergencies requiring immediate evacuation to service issues requiring inspection before next use. Knowing the difference prevents both under-reaction and unnecessary alarm.

Critical — Evacuate Now

Gas Odor (Rotten Egg / Sulfur Smell)

Natural gas has a mercaptan odorant added — the rotten egg smell is the warning. Do not attempt to find the leak or operate switches.

CO Alarm + Physical Symptoms

Headache, dizziness, nausea while gas appliance is running. CO at levels causing symptoms requires immediate exit and medical evaluation.

Visible Smoke from Gas Insert

A gas appliance producing visible smoke rather than clear exhaust means serious incomplete combustion or venting failure. Stop use immediately.

High — Stop Use Today

CO Alarm Without Symptoms

CO present but no one feeling ill — still a serious situation. Ventilate, turn off appliance, do not relight until venting is inspected.

Yellow or Orange Flame (Sustained)

Incomplete combustion producing CO continuously. Not a normal flame appearance for a gas burner — indicates burner or venting problem.

Soot Deposits Around Insert Face

Soot around the firebox opening of a gas insert means combustion byproducts are escaping into the room rather than being vented out.

Moderate — Schedule Inspection

Pilot Won't Stay Lit

Intermittent pilot or standing pilot failure. Not an emergency but indicates thermocouple or gas valve issue — requires service before reliable use.

Flame Flickering or Irregular

Occasional orange tips on an otherwise blue flame are normal. Persistent irregular flickering or rolling orange flame is not — schedule inspection.

Increased Condensation Near Fireplace

Gas combustion produces water vapor. Increased condensation on walls or glass near the fireplace may indicate venting restriction reducing exhaust flow.

Flame Appearance — What Normal Looks Like vs What to Watch For

Gas Fireplace Flame Color — Normal vs Abnormal Combustion

The color of a gas flame is a direct indicator of combustion quality. A properly burning gas appliance has a characteristic appearance — deviations from it are diagnostic signals, not cosmetic variations.

Normal Gas Flame Appearance

  • Predominantly blue flame — blue indicates complete combustion with sufficient air mixing
  • Minor orange or yellow tips at the top of the flame — acceptable and normal on decorative log sets
  • Stable flame that holds its shape when appliance is running normally
  • Clear, colorless exhaust — no visible smoke or soot at the vent termination outdoors
  • Flame height consistent and predictable once appliance has warmed up
  • No smell of gas or unusual chemical odor when appliance is running

Abnormal — Stop Use and Inspect

  • Sustained yellow or orange flame across most of the burner — incomplete combustion, producing CO
  • Flame lifting off the burner ports — indicates gas pressure issue or blocked burner ports
  • Flame rolling or flickering excessively — may indicate draft problem pulling air across burner
  • Black soot deposits forming on the ceramic logs, glass, or firebox interior
  • Flame size or height noticeably different from normal without adjustment — gas pressure or valve issue
  • Flame that frequently extinguishes and relights — thermocouple failure or gas supply problem

Overbrook — Gas Insert Conversion and Chimney Venting

Overbrook is a mixed-vintage neighborhood where a significant number of homes have had their original wood-burning fireplaces converted to gas inserts over the past two to three decades. Gas insert conversions — when done correctly — install a new liner sized specifically for the gas appliance's venting requirements inside the existing masonry chimney. The original masonry flue is too large for a gas insert to vent properly without a liner, and a gas appliance venting into an oversized masonry flue is a CO risk: exhaust cools too quickly in the large air volume, condenses, and can back-draft into the home.

The issue in many Overbrook conversions that were done in the 1990s and early 2000s is liner age and condition. Flexible stainless steel liners installed 20 or more years ago are reaching the end of their rated service life, and rigid aluminum liners — which were sometimes used for natural gas applications in that era — have a significantly shorter service life than stainless and may have already deteriorated. A gas insert that has been operating reliably for years can develop CO issues as the liner deteriorates, because the deterioration is internal and produces no visible symptom until the venting pathway is compromised enough to cause CO backup or CO alarm activation.

If your Overbrook home has a gas insert that was installed more than 15 years ago and has not had a liner inspection since installation, a venting system assessment is a reasonable precautionary step — particularly before the first heavy-use period of the heating season.

If You Smell Gas — Exact Steps in Order

Gas Odor Response — Eight Steps in Sequence

1

Do Not Operate Any Switches

Light switches, appliance switches, even a doorbell can produce a small spark. In a gas-filled space, any ignition source is dangerous. Leave switches as they are — do not turn anything on or off.

2

Do Not Use Your Phone Inside

Make all calls from outside the home and away from the structure. Cell phones produce a small electromagnetic field that in rare circumstances can trigger ignition in a heavily gas-saturated environment.

3

Leave Doors Open As You Exit

Open doors allow gas to dissipate from the home. Leave the front door open as you exit — this begins the ventilation process immediately without requiring you to remain inside.

4

Exit the Home Immediately

Do not stop to gather items, investigate the source, or attempt to find the leak. Get everyone including pets out of the home as quickly as possible.

5

Move Away from the Structure

Go to a neighbor's home or a distance from the building. Gas can accumulate at low concentrations outdoors near the structure — move far enough away that you cannot smell gas.

6

Call 911 and Your Gas Utility

Piedmont Natural Gas serves most of Greenville — their emergency line operates 24 hours. Call from outside and away from the home. If anyone has symptoms of CO poisoning, call 911 first.

7

Do Not Re-Enter Until Cleared

Wait for the gas utility or emergency services to confirm the home is safe before re-entering. Do not re-enter to check on anything — professionals have gas detection equipment you do not.

8

Call for Chimney Venting Inspection Before Relighting

After the gas company has resolved the immediate situation and identified the source, a chimney technician should inspect the venting system of the gas fireplace or insert before it is used again — particularly if the leak originated at a gas supply connection inside the firebox area.

Gas Fireplace Venting Types — CO Backdraft Risk by Configuration

Vent Type How It Works CO Backdraft Risk Primary Emergency Risk Factors
Natural Draft B-Vent Draws room air for combustion; exhausts up through metal B-vent pipe to exterior Moderate-High Negative air pressure in tight homes draws exhaust back down; blockage causes immediate CO backup; cold flue on startup can cause back-draft
Gas Insert in Masonry (with liner) Flexible or rigid liner installed in masonry flue sized to insert; draws room air for combustion Moderate-High Liner deterioration allows CO to escape into chimney chase; oversized liner causes condensation and backdraft; blocked liner cap causes CO backup
Gas Insert in Masonry (no liner) Exhausts into oversized masonry flue without dedicated liner — incorrect installation High Exhaust cools and condenses in oversized flue; CO backdraft risk is elevated; not to code — requires liner installation
Direct Vent (sealed combustion) Co-axial pipe draws outside air in and exhausts out through same pipe assembly; firebox sealed from room Low Damaged or incorrectly installed termination cap; blocked outer combustion air intake; seal failure allowing exhaust into room
Vent-Free (no flue) Burns in room; combustion products enter living space directly; relies on room size for safety margin High in small/sealed rooms Room too small or too well-sealed; extended run time; sensor failure; moisture and CO accumulation without occupant awareness
Common Questions — Overbrook Gas Fireplace Emergency Service

Gas Fireplace & Insert Emergency Questions

A gas smell is a gas leak situation — not a chimney problem to diagnose. Do not attempt to find the leak, do not operate any switches or electrical devices, and do not use your phone inside the home. Leave the home immediately, leaving doors open as you exit. Once outside and away from the structure, call 911 and your gas utility company. Do not re-enter until the gas company has confirmed there is no active leak. After the gas company clears the situation, a chimney technician can assess whether the venting system contributed to the issue before the appliance is used again.
A sustained yellow or orange flame in a gas fireplace indicates incomplete combustion — the gas is not burning completely due to insufficient air reaching the burner, or a dirty or obstructed burner. Incomplete combustion produces carbon monoxide. A gas appliance with a yellow or orange flame rather than a primarily blue flame should not continue to be used. Turn the appliance off, ventilate the area, and have the burner assembly, air supply, and venting system inspected before relighting. If a CO detector alarms while the appliance runs with abnormal flame color, treat it as a CO emergency and evacuate.
Yes, though the mechanisms differ. A gas insert installed in a masonry chimney requires a correctly sized liner to vent properly — if the liner is missing, undersized, or has deteriorated, CO and combustion gases can escape into the chimney chase and adjacent living spaces. A blocked flue on a gas insert is arguably more dangerous than on a wood fireplace because gas combustion produces CO continuously and silently, without the visible smoke that warns occupants of a wood fire rollout situation.
A CO alarm during gas fireplace operation points to the venting system as the most probable cause if the alarm did not previously occur. Common causes: a blocked or partially blocked flue vent; a closed or stuck vent termination cap; negative air pressure in a tightly sealed home drawing flue gases back down; or a deteriorated liner allowing CO to escape into the home rather than vent outdoors. Evacuate if anyone has symptoms, ventilate, turn off the gas appliance, and do not relight until a chimney technician has inspected and cleared the venting system.
B-vent fireplaces draw combustion air from inside the room and vent exhaust up through the flue — they are susceptible to the same back-draft and blockage problems as wood-burning fireplaces. Direct-vent fireplaces draw combustion air from outside and are sealed from the room — significantly less susceptible to back-drafting. Vent-free gas fireplaces have no flue at all and vent combustion products entirely into the room — they rely on room size and ventilation to remain safe, and any vent-free appliance in a small or tightly sealed room presents inherent CO risk.

Gas Fireplace Emergency Service — Overbrook, Greenville SC

Gas odor, CO alarm, yellow flames, smoke from a gas insert — stop use and call. Serving Overbrook and surrounding Greenville neighborhoods.

(864) 794-6932