24/7 Emergency Gas Furnace Repair Across Long Island
When your natural gas furnace stops firing, the cause is usually one of a small set of well-known failure points: a dirty flame sensor that the control board can no longer detect, a hot-surface ignitor that cracked on a heat-up cycle, a gas valve that failed open or closed, a pressure switch that won't make on call for heat, or a control board that has thrown a fault code and locked the system out. Gas furnace diagnosis is a methodical process, and a real gas-fitter technician with the right tools can usually identify and fix the problem in one visit.
All Island Comfort has answered Long Island gas furnace emergency calls since 2004. Our techs are licensed for gas-fitting work in Suffolk and Nassau counties, and our trucks are stocked with the gas furnace parts that fail most often. The same local Wading River number rings to a real dispatcher 24/7, including holidays. The phrase "emergency gas heater repair" is also covered here, since most Long Island residents who say "gas heater" are referring to a gas furnace (the broader term).
If your gas furnace is in lockout, the burner won't fire, the inducer motor won't run, the pilot won't stay lit on an older standing-pilot system, or you smell gas at any concentration, call us immediately. For an active gas smell, leave the house first, call 911 and National Grid (1-800-490-0045), then call us to coordinate the safe restart of your heating system.
Gas Furnace Down? Call Now.
Real local gas-fitter techs 24/7. We'll triage on the phone and dispatch.
Call 631-591-2289Every Gas Furnace Type We Repair on Emergency Calls
Long Island residential gas furnaces span four decades of manufacturing and many efficiency tiers. Our techs work on every common style and brand.
- 80% AFUE atmospheric-vent gas furnaces: Older B-vent gas furnaces with metal flue piping into a chimney. Spill switch, draft hood, and combustion-air diagnostics.
- 90%+ AFUE high-efficiency condensing gas furnaces: Direct-vent gas furnaces with PVC venting and condensate drains. Pressure-switch, condensate-trap, and inducer-motor specifics.
- 95%+ AFUE modulating gas furnaces: Variable-output condensing furnaces (Carrier Infinity, Trane XV, Bryant Evolution, Lennox SLP98). Communicating control board diagnostics.
- Two-stage gas furnaces: Gas furnaces with high-fire and low-fire stages. Two-stage gas valve and staging-control diagnostics.
- Single-stage gas furnaces: Standard fixed-output furnaces. The majority of Long Island residential installs.
- Hot-surface ignition gas furnaces: Modern gas furnaces with HSI ignitors. Cracked-ignitor and weak-spark diagnostics.
- Standing-pilot gas furnaces: Older gas furnaces with a continuous pilot light. Thermocouple and pilot-orifice diagnostics.
- Direct-spark ignition gas furnaces: Mid-vintage gas furnaces with electronic spark. Spark-electrode and gap diagnostics.
- Gas wall heaters & gas heaters: Direct-vent gas wall heaters and "gas heaters" in additions, finished basements, and small spaces.
- Mobile-home gas furnaces: Specialty narrow-cabinet furnaces in manufactured homes.
- Gas valves & gas trains: Single-stage, two-stage, and modulating gas valves. Solenoid and regulator diagnostics.
- Inducer motors: Draft inducer motors that pull combustion gases through the heat exchanger. Bearing failure and pressure-switch interaction diagnostics.
- Furnace control boards: Integrated furnace controls. Diagnostic flash codes, communication faults, and full-board replacement.
- Gas-line connections (residential): Visible gas piping inspection, leak check with combustible-gas detector, and shutoff-valve diagnosis. Anything inside the gas company's meter is utility responsibility.
Common Gas Furnace Emergency Symptoms
Gas furnace emergencies tend to fall into recognizable patterns. Knowing the symptom helps the dispatcher route the right tech with the right parts on the truck.
Furnace Cycles 30 Seconds Then Locks Out
Classic flame-sensor failure. The burner lights but the control board can't "see" the flame, so it shuts the gas off as a safety. We clean or replace the flame sensor on the spot. Five-minute fix once we're there.
Furnace Tries to Ignite But Won't Light
Hot-surface ignitor failure (cracked silicon nitride or silicon carbide ignitor) or gas valve failure. Both common on furnaces 8+ years old. We carry both parts on the truck for the major brands.
Inducer Motor Runs But Burner Won't Fire
Pressure switch isn't making, gas valve isn't opening, or ignition control board is faulty. Diagnostic flow chart and multimeter sort it out in 15 minutes.
Furnace Won't Even Start the Cycle
Inducer motor doesn't even turn on. Usually a control-board fault, a tripped pressure switch, a low-voltage transformer issue at the air handler, or a thermostat wiring problem. Simple multimeter diagnosis.
Pilot Light Won't Stay Lit
On older standing-pilot gas furnaces, the thermocouple weakens with age and stops generating enough millivolt signal to hold the gas valve open. We replace thermocouples on the spot. New furnaces with HSI don't have this issue, but a cracked HSI mimics the symptom.
Smell of Gas Near the Furnace
Treat as a true emergency. Leave the house, call 911 and National Grid 24-hour gas leak line at 1-800-490-0045 first, then call us. We'll coordinate the safe restart after the utility clears the leak. Do not flip switches or use phones inside the house.
Banging or Booming on Ignition
Delayed ignition. Gas accumulates in the chamber before lighting, then ignites with a boom. Dangerous condition. Causes: dirty burner, weak ignitor, low gas pressure, or heat exchanger crack. Shut the furnace off and call us.
Carbon Monoxide Alarm Activated
Most serious gas furnace emergency. Get fresh air immediately, call 911 if anyone has symptoms (headache, dizziness, nausea), then call us. Causes are typically a cracked heat exchanger, blocked flue, or back-drafting. We diagnose with calibrated CO meter and combustion analyzer.
Smell Gas? Don't Even Read the Rest. Leave & Call 911.
Active gas leak: leave first, call 911 + National Grid 1-800-490-0045, then us. We'll coordinate the safe restart.
Call 631-591-2289Our 4-Step Rapid Response for Gas Furnace Emergencies
- 1Triage on the call. A real Long Island dispatcher answers and walks through your symptoms. We rule out anything you can fix in 60 seconds (thermostat, breaker, reset button), then dispatch immediately. No phone tree, no offshore call center.
- 2Local tech to your door. Typical response is 1 to 3 hours across Suffolk and Nassau, faster for the North Shore corridor between Wading River and Port Jefferson. Your tech texts when 15 minutes out.
- 3Diagnose and quote before any wrench moves. Flat diagnostic fee, written quote on-site, your written approval before any repair starts. No surprise charges, no upselling.
- 4Restore safe heat tonight when possible. About 85% of our gas furnace emergency calls finish on the first visit because the trucks carry hot-surface ignitors, flame sensors, gas valves, pressure switches, inducer motors, and capacitors for the major brands. For uncommon parts we identify them on visit one and return next-day without a second diagnostic charge.
What to Do While You Wait for the Technician
- If you smell gas, leave the house immediately. Do not flip switches, light matches, or use phones inside. Call 911, then National Grid (1-800-490-0045), then us once you're outside.
- If no gas smell but no heat, close interior doors and run cold tap drips to prevent frozen pipes.
- Replace thermostat batteries if the screen is blank or dim. Many "furnace failures" are dead batteries.
- Check the breaker and emergency switch. Both must be on for the furnace to receive power.
- Do not keep resetting the furnace if it locks out repeatedly. Each reset attempt risks pumping unburned gas into the chamber.
- If you have a CO alarm activation, get fresh air immediately and call 911 if anyone has symptoms (headache, dizziness, nausea). Then call us.
- Do not use unvented kerosene heaters or the gas oven for heat. Both produce dangerous CO indoors.
Why Long Island Trusts Us With Gas Furnace Emergencies
- 22+ years on Long Island. Family-owned in Wading River since 2004. We know the housing stock and the equipment families.
- A real person answers, day or night. 24/7/365 dispatch from a local Long Island number, not an answering service.
- Heavily stocked trucks. Most calls finish on the first visit because the parts that fail most often live on every truck.
- Cross-trained on every fuel and system. Gas, oil, electric, propane, heat pump, hydronic, steam, radiant. One company, no subcontracting.
- Licensed for everything we do. HVAC, plumbing, oil-burner, gas-fitting, EPA Section 608 refrigerant. Insurance certificates on request.
- Flat, transparent pricing. Diagnostic fee disclosed on the phone. Repair quote in writing before work starts. After-hours premium disclosed up front.
- Service plan members skip the line. Annual maintenance plan members get first dispatch priority and reduced after-hours rates.
Long Island Service Area for Emergency Gas Furnace Repair
We dispatch gas-licensed techs to all of Suffolk and Nassau counties from our Wading River base. If you're on Long Island and have a gas furnace emergency, we'll get to you.
Suffolk County
- Wading River
- Riverhead
- Mount Sinai
- Rocky Point
- Shoreham
- Miller Place
- Port Jefferson
- Setauket
- Stony Brook
- Smithtown
- Huntington
- Northport
- Centereach
- Patchogue
- Sayville
- Manorville
- Calverton
- Mattituck
- Cutchogue
- Greenport
- Westhampton
- Hampton Bays
- Southampton
- East Hampton
Nassau County
- Hempstead
- Oyster Bay
- Long Beach
- Garden City
- Hicksville
- Levittown
- Massapequa
- Mineola
- Freeport
- Westbury
- Plainview
- Syosset
- Bethpage
- Farmingdale
- Manhasset
- Great Neck
- Port Washington
- Roslyn
- Glen Cove
- Rockville Centre
- Valley Stream
- Lynbrook
- Wantagh
- Bellmore
Related Emergency Services
If your furnace is oil-fired instead of gas, or if the issue is on a boiler or different heating system, jump to the right page below.
-
Emergency Furnace Repair
Forced-air furnace not igniting, blowing cold, short-cycling, or locked out. Same-day diagnosis.
Available 24/7 -
Emergency Oil Furnace Repair
Oil furnace lockout, smoke, soot, no-fire. Oil-burner specialists with parts on the truck.
Available 24/7 -
Emergency Gas Boiler Repair
Gas boiler ignition, gas valve, circulator, or zone control failure. Same-day dispatch.
Available 24/7 -
Emergency Heating Repair
Heat is out, equipment silent or not warming. Any heating system, gas, oil, electric, or hydronic.
Available 24/7
Related Standard Services
If it's not an after-hours emergency, our standard service pages cover routine repair, replacement, and tune-ups at non-emergency rates.