A furnace pilot light that has gone out is a common yet concerning issue for homeowners, especially during the chilly months in the South Bay area of Los Angeles. The pilot light is a small flame that ignites the gas burner in your furnace. When it goes out, your heating system cannot function, leaving your home cold and uncomfortable. This problem can manifest suddenly, often without warning, and can be particularly alarming for families who rely on their heating systems for warmth. Understanding the causes and solutions can help you address the issue quickly, ensuring the comfort and safety of your household.
If you smell gas when attempting to relight, stop and call your gas company. Do not use matches or lighters if gas smell is present.
$100 - $400 for thermocouple or flame sensor
30 minutes to 2 hours
urgent
When to call: Don't attempt to repair pilot or gas components yourself. If pilot won't stay lit after relighting once, professional service is needed.
1. Check for Drafts: Inspect the area around the furnace for any drafts or open windows that might be affecting the pilot light.
2. Examine the Pilot Light: Look at the pilot light to see if it's completely out or just flickering. If it's out, proceed to the next steps.
3. Clean the Pilot Orifice: If you feel comfortable, gently clean the pilot orifice with a soft brush to remove any debris.
4. Inspect the Thermocouple: Ensure the thermocouple is properly positioned and not damaged. If it's loose or faulty, it may need replacement.
5. Verify Gas Supply: Make sure the gas supply to the furnace is turned on. Check other gas appliances to see if they are working.
6. Observe Weather Conditions: Consider whether recent high winds or severe weather could have affected the pilot light.
Homeowners can safely perform initial diagnostic steps such as checking for drafts, inspecting the pilot light, and verifying that the gas supply is on. Cleaning the pilot orifice may also be feasible for those comfortable with basic maintenance tasks. However, if the issue persists after these checks, or if you are unsure about handling components like the thermocouple or gas valve, it’s crucial to call a professional. Gas-related issues can be hazardous, and a qualified technician can ensure that repairs are done safely and effectively.
If your pilot light goes out repeatedly or if you notice any unusual smells, such as gas, it is vital to call a professional HVAC technician immediately. Additionally, if you are uncomfortable performing any checks or repairs yourself, do not hesitate to seek professional help. Safety should always be the top priority when dealing with gas appliances.
A furnace that won't produce heat can be a safety concern and a major discomfort, especially during cooler South Bay evenings.
A furnace that blows cold air isn't completing the heating cycle, leaving your home cold despite the system running.
Short cycling means your system turns on and off frequently without completing a full heating or cooling cycle. This wastes energy and stresses components.
Fast 45 Minutes response throughout South Bay
Average dispatch time in most service areas in South Bay.
Full coverage within 30 miles of Torrance.
Emergency service any time. Scheduling 8:00 AM - 8:00 PM.
A furnace pilot light that won't stay lit prevents heating. This issue is common in older furnaces and usually has straightforward causes.
Pilot Out is one of the more common HVAC complaints we see in South Bay. The challenge is that the same symptom can have multiple root causes, and the wrong diagnosis turns a $150 fix into a $1,500 mistake. Below is the actual diagnostic order our technicians follow, refined over thousands of field calls.
Some causes of pilot out can be ruled out (or fixed) without a technician. We always tell customers: try these first, in this order. If any of them resolve the issue, you've saved yourself a service call.
Don't attempt to repair pilot or gas components yourself. If pilot won't stay lit after relighting once, professional service is needed.
Safety alert: If you smell gas when attempting to relight, stop and call your gas company. Do not use matches or lighters if gas smell is present.
Typical repair cost for pilot out: $100 - $400 for thermocouple or flame sensor. Repair time: 30 minutes to 2 hours. Our diagnostic fee is $89 and is waived with repair. We provide a written quote before any repair work begins, and we never use "while we're in there" upselling.
Some causes of pilot out are unavoidable (component aging, manufacturing defects), but most are preventable with simple maintenance. Our most-recommended prevention steps:
Verified reviews from customers who had pilot out issues resolved by our team.
“Temperature dropped to 41°F overnight, furnace wouldn't ignite. Called at 6:18 am — tech was at our place by 7:40. Diagnosed a failed pressure switch (proved it with a manometer test), had the OEM Honeywell SmartValve part on the truck, swapped it. Also found a partly-clogged condensate trap was kicking the secondary safety. Fully tested under load before he left. House was 70°F by 9:30.”
Andrew Z.
Gardena
Heating Repair
March 4, 2025
“Carrier 59TN furnace (Hot Surface Ignition) wouldn't fire. Tech diagnosed a failed control board (CESO110057-02) — common on this model around year 12. Had a refurbished board on his truck (with a 3-year warranty), saved us $180 vs a new one. Total visit: 70 minutes. Technically minded, doesn't talk down to you, doesn't try to upsell.”
Michael R.
Lakewood
Heating Repair
February 19, 2025
“Our 12-year-old Carrier Performance 16 quit on the hottest Saturday of August. Called at 2:14 pm, tech Marco was in our driveway near Sepulveda by 3:05 — under an hour. Diagnosed a failed dual-run capacitor (45/5 µF) in fifteen minutes, had the OEM part on the truck. Total visit was 90 minutes. He also flagged that our condenser fins were salt-pitted from the marine layer and showed me how to rinse them quarterly. Honest pricing, no upsell.”
Michael R.
Torrance
AC Repair
August 14, 2025
“Been on their twice-yearly tune-up plan since 2022 — Lennox Elite 16ACX outside, EL296V furnace inside. They always text the day before, show up in the window, and email the report with static-pressure and refrigerant subcooling numbers. Last spring they caught a slow R-410A leak at the schrader valve before it turned into a $1,200 problem. Worth every dollar of the $189/year membership.”
Jennifer K.
Torrance
HVAC Maintenance
July 2, 2025
“Another company had quoted me $8,000 for a complete furnace replacement claiming a cracked heat exchanger. RedAlert sent a tech with a borescope camera, ran the unit, did a CO test in the supply plenum (came back at 0 ppm), and showed me on screen there was no crack — just a failed hot-surface ignitor. $350 part + labor and the 80% AFUE Goodman has been running clean for ten months. Will never call anyone else.”
David L.
Torrance
Furnace Repair
January 22, 2025
“Replaced a 19-year-old 10 SEER unit with a Carrier Performance 17 (3-ton) and matching evaporator coil. Crew did the manual-J load calc, oversized the line set by an inch, pulled a deep vacuum (500 microns held for 20 min — they showed me the gauge). Took a full day plus a return for permit close-out. Lost a star only because the original quote underestimated the disconnect-box upgrade by $180; they ate the difference without asking.”
Sarah M.
Torrance
AC Installation
September 30, 2024
Quick answers to common HVAC questions
To relight your furnace pilot light, first ensure the gas supply is on. Then, follow the manufacturer's instructions, typically involving turning the gas valve to 'off' for a few minutes, then to 'pilot,' and using a long lighter to ignite the pilot light.
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