Why My Gas Fireplace Won't Light
There’s nothing more frustrating than flipping the switch on your gas fireplace, only to find that nothing happens. If your gas fireplace won’t light, you’re not alone. It’s one of the most common service calls we get at Cozy Fireplace + Patio, especially as cooler weather rolls in.
Before you panic or call for a full replacement, there are a few things you can check to potentially fix the problem yourself.
1. Check Your Pilot Light
The pilot light is the small flame that stays lit so your fireplace can ignite on command. If your fireplace isn’t lighting, the first place to check is the pilot.
Common reasons your pilot light won’t stay lit:
The gas valve is turned off
There’s air in the gas line (especially after long periods of disuse)
The thermocouple is dirty or failing
A strong draft blew out the flame
What you can try:
Make sure the gas valve is fully open
Try relighting the pilot following your owner's manual
If it lights but won't stay on, the thermocouple might need cleaning or replacement
2. Dead Batteries in the Remote or Wall Switch
Many modern gas fireplaces are controlled by a remote, a wall switch, or even a thermostat. If your fireplace doesn’t respond, it could be something as simple as a dead battery.
Check these spots:
Batteries in your remote
Batteries in the receiver box (usually hidden near or behind the fireplace)
Batteries in wall-mounted switches
Replacing the batteries can often bring your fireplace back to life in seconds.
3. Check the Thermocouple or Thermopile
If your pilot lights but the fireplace still won’t ignite, the issue might be with the thermocouple or thermopile, components that help your system detect heat and signal the gas valve to stay open.
Over time, these parts can:
Get dirty
Wear out
Lose contact with the pilot flame
What to do:
Inspect for visible dust or corrosion
Gently clean with fine steel wool if you’re comfortable doing so
If that doesn’t fix it, they may need to be replaced by a technician
4. Is There a Gas Supply Issue?
Make sure your gas supply hasn’t been shut off or disrupted. If you’ve recently had work done on your gas lines, moved into a new home, or switched utility providers, this could be a factor.
You should also check other gas appliances in the home (like a stove or water heater). If they’re not working either, the issue may be with your home’s gas supply.
5. It Could Be Time for Maintenance
Like any appliance, gas fireplaces need occasional maintenance to work reliably. Dust, pet hair, and debris can block sensors or prevent proper ignition. If you haven’t had your fireplace serviced in over a year, it may be time for a professional inspection and tune-up.
Cozy Fireplace + Patio offers expert service and troubleshooting to get your fireplace running safely and efficiently.
When to Call the Pros
If you’ve tried the basic troubleshooting steps and your gas fireplace still won’t light, don’t risk damaging the unit or compromising your safety. It’s best to call a certified technician.
At Cozy, we’re here to help with:
Pilot light and ignition issues
Thermocouple and thermopile replacement
Routine maintenance and safety inspections
Upgrades to modern remote systems
Stay Warm the Safe Way
If your gas fireplace still won’t light after basic troubleshooting, it’s time to call in the pros. At Cozy Fireplace + Patio, we specialize in diagnosing and repairing all types of fireplace issues, from pilot light problems to worn-out thermocouples and remote control malfunctions. We also offer routine maintenance to keep your fireplace running safely and efficiently all season long. Whether you need a quick fix or want to explore modern replacement options, our team is here to help. Give us a call, schedule a service online, or stop by our San Antonio showroom to get your fireplace back to cozy in no time.