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Quick Overview
There are a few common reasons why a gas fireplace pilot light won’t start:
- No gas flow – The gas line may be turned off or there could be a clog preventing gas flow.
- Dirty pilot assembly – Buildup of dirt, soot, or spider webs can prevent the pilot from lighting.
- Dead thermocouple – The thermocouple generates a small electric current to hold the gas valve open. If it’s dead, no gas will flow.
- Faulty gas valve – The valve itself may be stuck or broken, not allowing gas to pass even when clicked.
The first steps are to confirm the gas supply is turned on and to clean any debris from the pilot assembly. If those don’t resolve the issue, the thermocouple and/or gas valve may need replacement by a professional.
Step-by-Step Pilot Light Troubleshooting
Here are the detailed steps to troubleshoot why your gas fireplace pilot light won’t start:
1. Confirm you have gas supply
Before anything else, you need to check that gas is actually flowing to the fireplace. There should be a shutoff valve nearby, often near the gas meter. Verify that this valve is turned on and allowing gas flow.
The orientation of the handle indicates if it’s on or off:
- Handle parallel to pipe = GAS ON
- Handle perpendicular to pipe = GAS OFF
Turn the valve to align with the pipe to enable gas flow. Then, try igniting the pilot light again. If it still doesn’t light, proceed to the next steps.
2. Clean the pilot assembly
Assuming you have gas supply, the next most common issue is a blocked pilot tube or blocked igniter/flame sensor. These can get obstructed by dirt, spider webs, pet hair, lint, and other debris.
Carefully clean around the pilot assembly with compressed air or a vacuum hose. Pay special attention to the small pilot tube opening and the igniter/sensor tip. Avoid bending any parts while cleaning.
Also inspect the area for any spider webs or insect nests that could be blocking gas flow. Remove any obstructions that are found.
With a clean pilot assembly, attempt to light it again. If the pilot still fails to ignite, continue to the next steps.
3. Check connections and thermocouple
The pilot flame heats up a thermocouple, which generates a small voltage to operate the gas valve. Check that the thermocouple is properly connected at both ends. Make sure the connections are tight and secure.
A multimeter can be used to check if the thermocouple is producing a voltage:
- Disconnect the thermocouple from the gas valve.
- Ignite the pilot flame.
- Check for at least 15 millivolts DC on the multimeter when holding the thermocouple tip in the pilot flame.
If zero voltage, then the thermocouple needs replacement. A properly working one should produce more than 15 mV when heated by the pilot.
Also inspect where the thermocouple connects to the gas valve. Make sure the connections are tight and that the tip of the thermocouple extends into its slot.
4. Replace the thermocouple
If voltage checks confirm the thermocouple is dead, replacement is needed. Follow these steps:
- Turn off gas supply and allow fireplace to cool completely.
- Remove the screw holding the thermocouple tip to the pilot assembly.
- Unscrew the thermocouple nut from the gas valve.
- Pull the thermocouple out of its slot in the valve.
- Install new thermocouple and tighten screw and nut.
- Reconnect gas supply and test pilot operation.
Be very careful not to bend or break the new thermocouple. Get the tip centered in the pilot flame. If the connections are tight and it’s positioned correctly but the pilot still won’t stay lit, proceed to check the valve.
5. Inspect the gas valve
The gas valve allows gas to flow to the pilot and main burners. If it’s stuck or broken, gas won’t flow even when the pilot is lit.
Do a visual inspection of the valve first. Look for any cracks, damage, or leaks. Next, listen closely as you toggle the valve on and off. You should hear a click indicating the internal switch functioning properly.
If the valve appears damaged or you don’t hear it click, replacement will be necessary. This requires disconnection from gas supply lines. It should be done by a professional plumber or HVAC technician.
If no issues are found, the valve could still be malfunctioning internally. A technician can troubleshoot further by checking for proper voltage. Replacement may be needed if voltage is abnormal.
6. Professional repair or replacement
If you’ve tried all the DIY troubleshooting steps but the pilot still fails to light, it’s time to call a pro. A technician can evaluate thermocouple voltage, gas pressure, valve operation, and other components. They have the expertise to get your fireplace pilot going again.
Some pros will even offer guaranteed pilot light relighting services. This can save you money over just calling them out each time it goes out. Consider upgrading to an electronic pilot assembly for maximum reliability.
Though a last resort, your entire gas valve or control system may need replacement if it’s older or damaged. This will add cost but is sometimes necessary for ongoing safe operation.
Common Pilot Light Troubleshooting Questions
Why does my pilot light keep going out?
If a gas fireplace pilot light won’t stay lit, the thermocouple is most often the cause. This small device generates just enough voltage to operate the gas valve. If it fails to produce voltage, the valve shuts off gas flow and the flame goes out. A bad thermocouple must be replaced.
Can I light the pilot light myself?
You can certainly attempt to relight a gas fireplace pilot yourself. The process involves igniting the flame while simultaneously pressing the gas valve knob at the correct time. It may take a few tries to get right. If you can’t get it lit after several attempts, call a professional for assistance.
Why does my pilot have an orange flame?
A small orange flame on the pilot is usually normal and nothing to worry about. Large, flickering orange flames or lots of black smoke indicate an issue. This is often caused by blocked gas ports, which reduces proper air flow. Cleaning the pilot assembly and orifice should restore a mostly blue pilot flame.
Should I have my pilot light on all the time?
There are pros and cons to leaving your gas fireplace pilot on continuously. An always-burning pilot provides convenience, but wastes some gas while the main burner isn’t on. Newer electronic pilots and safety systems reduce risks associated with a standing pilot light. Never leave a pilot burning in a vacant home. Discuss your options with a technician.
Why do I smell gas when I try to light the pilot?
If you detect a gas smell when trying to ignite the pilot light, immediately turn off the gas supply valve and call the gas company. Never attempt to light a pilot when gas odor is present. The smell likely indicates a serious leak. An emergency gas line shutoff is needed until repairs can be made.
Conclusion
Troubleshooting problems with getting a gas fireplace pilot light started begins with confirming gas supply and cleaning the pilot assembly. Dead thermocouples or faulty gas valves are common causes as well. Persistent issues should be evaluated by a professional technician to identify any necessary repairs or part replacements needed for safe operation. Keeping your pilot assembly debris-free and getting annual service checks can help prevent annoyances with keeping your fireplace working properly.
Cleaning Tips for Gas Fireplace Maintenance
Proper cleaning and maintenance is key to keeping your gas fireplace operating safely and efficiently. Here are some helpful tips:
Clean the Glass
Use a mild glass cleaner and soft cloth to wipe down the inside of the glass door periodically. Avoid abrasive cleaners. Also clean the exterior glass surface as it collects dust and fingerprints.
Inspect the Vent System
Make sure the chimney cap is free of debris like bird nests or leaves. Ensure ventilation pathways are clear. Rodents sometimes nest in vent pipes.
Check the Burners
Remove logs/coals and use a vacuum hose to suck up dust and debris around the burners. Reinstall components carefully.
Use a Vacuum Hose
Use a soft brush attachment to gently vacuum the pilot assembly, burner surfaces, and surrounding compartment.
Wipe Down Surfaces
Wipe down exterior surfaces like the door, trim, and screens with a standard household cleaner. Avoid abrasive scouring pads.
Clean Fan Blades
Unplug and use a vacuum crevice tool to clean each fan blade of any built up dust.
Replace Screens
Inspect metal screens in the vents and pilot enclosure. Replace damaged or heavily rusted screens as needed.
Have a Professional Cleaning
For a thorough deep cleaning, contact a chimney sweep. They can safely clean the entire system and make repairs if necessary.
Following these basic cleaning tips will help keep your gas fireplace looking great and working properly for years of cozy enjoyment.
Gas Fireplace Pilot Light Troubleshooting Table
| Issue | Potential Causes | Solutions |
|---|---|---|
| Pilot won’t light | No gas flow | Confirm gas supply valve is on |
| Clogged pilot tube | Clean pilot assembly | |
| Dead thermocouple | Replace thermocouple | |
| Faulty gas valve | Test/replace gas valve | |
| Pilot won’t stay lit | Thermocouple issue | Check/replace thermocouple |
| Large orange pilot flame | Blocked pilot tube | Clean pilot assembly |
| Gas smell when lighting | Gas leak | Turn off gas, call professional |
Conclusion
Troubleshooting a gas fireplace pilot light that won’t start requires methodically checking each component. Verify gas supply, clean the pilot assembly, test the thermocouple, and evaluate the gas valve. If issues persist, professional repair by a technician may be needed. Additionally, regular fireplace cleaning and maintenance can prevent many pilot light problems. Refer to the helpful troubleshooting tips in this article to get your gas fireplace pilot going again for cozy ambiance and warmth.
Safety Tips for Gas Fireplace Pilot Lights
Gas fireplace pilot lights allow for convenient ignition of your fireplace, but also require some safety awareness:
- Never leave a pilot burning in a vacant property – turn it off
- Annual professional inspection of all gas components
- Install carbon monoxide detectors near all gas appliances
- Keep flammable materials away from the fireplace
- Ensure adequate ventilation for operation
- If gas odor detected, leave immediately and call gas company
- Consider installing electronic pilot for added safety
- Replace thermocouple every few years or at first sign of trouble
- Clean pilot assembly regularly to allow proper gas flow
- Turn off gas supply before repairs or troubleshooting
- Make sure glass screen is closed during operation
Gas fireplaces provide beautiful ambiance, but also require care and caution. Follow these tips and work with qualified professionals to ensure many years of safe, cozy fireplace enjoyment.
Stay warm!