How to Troubleshoot Common Gas Fireplace Insert Problems

A gas fireplace insert provides warmth and ambiance with the convenience of a switch or remote control. However, like any appliance, it can occasionally experience issues. Knowing how to troubleshoot common problems can save time and frustration. Below are some of the most frequent issues homeowners encounter with their gas insert, along with simple troubleshooting steps to help restore functionality. 

Fireplace Won’t Turn On 

If your gas fireplace insert isn’t turning on, start with these checks: 

• Confirm the gas supply– Ensure the gas valve is open and supplying fuel to the unit. 
• Check the pilot light– If your insert has a standing pilot light, verify that it is lit. If not, follow the manufacturer’s instructions to relight it. 
• Replace batteries– If your unit uses a remote or wall switch, check and replace any weak or dead batteries. 
• Inspect the power supply– If your fireplace is electric-ignition, ensure it's plugged in and receiving power. 

Resetting a Locked Control Module 

One of the most common problems with a gas insert is the fireplace failing to light or respond to the remote due to a locked control module. To reset it, follow these steps: 

1. Reset the breaker– Turn off and restore power to the fireplace via the circuit breaker. 
2. Manually reset the module – If the issue persists, remove the fireplace front panel by lifting it up and away. 
3. Check for LED signals – Inside the fireplace, locate the control module and check for blinking red and green lights, indicating a lockout. 
4. Perform the reset– Slide the reset switch left to turn it off, then back right to restore the remote or wall switch setting. A beep will confirm the reset. 
5. Test the remote – Try turning the fireplace on with the remote to verify functionality before replacing the front panel. 

Strange Odors When Operating 

If you notice unusual smells coming from your gas fireplace insert, consider these potential causes: 

• Dust buildup – A fireplace that hasn’t been used for a while may emit a burning dust smell during the first few uses. Running the fireplace on high for about 30 minutes should resolve this. 
• Gas leaks – If you detect a strong gas smell, immediately turn off the gas supply and ventilate the area. Contact a professional for inspection. 
• Blocked venting – A dirty or obstructed vent can cause improper combustion, leading to odors. Have your venting system checked and cleaned regularly. 

Unusual Noises 

Your gas insert should operate quietly, so if you hear unexpected sounds, check the following: 

• Clicking– Some clicking is normal as the fireplace ignites and the metal components expand with heat. However, excessive or persistent clicking may indicate a faulty igniter or loose connections. 
• Whistling – A whistling noise may be caused by an improperly adjusted gas pressure regulator or an obstruction in the gas line. 
• Blower noise – If your fireplace has a fan, rattling or loud humming noises could indicate dust buildup or a loose fan blade. Cleaning or adjusting the fan can often fix the issue. 

Soot or Creosote Buildup 

Excessive soot buildup inside your gas fireplace insert can indicate incomplete combustion. Possible causes include: 

• Dirty burner ports – Clogged burner ports can lead to uneven flames, increasing soot production. 
• Improperly positioned logs– Ensure the logs are arranged according to manufacturer instructions. Misplaced logs can disrupt airflow and create excess soot. 
• Ventilation issues – Poor venting can contribute to incomplete combustion. Have a professional inspect and clean the venting system annually. 

How to Clean and Maintain Your Gas Insert 

Routine cleaning helps keep your gas fireplace insert in peak condition. Here are some basic maintenance steps: 

How to Remove & Clean the Glass 

1. Turn off the fireplace and allow it to cool completely. 
2. Remove the glass front following manufacturer instructions. 
3. Use a non-ammonia-based cleaner or fireplace glass cleaner with a soft cloth. 
4. Dry the glass thoroughly before reattaching it. 

Cleaning the Sensor Rod 

A dirty sensor rod can cause ignition problems. To clean it: 

1. Locate the sensor rod near the pilot light. 
2. Use fine-grit sandpaper or steel wool to remove any carbon buildup. 
3. Wipe it clean and ensure it’s securely positioned. 

Fixing a Noisy Fan 

If the fan in your gas insert is making noise: 

1. Turn off power to the unit. 
2. Remove dust and debris from the fan blades with a soft brush or compressed air. 
3. Check for loose mounting screws and tighten them as needed. 

Relighting the Standing Pilot 

If your standing pilot light goes out: 

1. Turn the gas control knob to the “off” position and wait a few minutes. 
2. Turn the knob to “pilot” and press it down while lighting the pilot with a match or igniter. 
3. Continue holding the knob down for 30-60 seconds to allow the thermocouple to warm up. 
4. Release the knob and confirm that the pilot stays lit. 

When to Call a Professional 

While some issues can be resolved with simple troubleshooting, there are times when professional service is necessary: 

• The fireplace repeatedly fails to light. 
• You smell gas near the unit. 
• The pilot light won’t stay lit despite multiple attempts. 
• There is excessive soot buildup inside the unit. 
• The fireplace shuts off unexpectedly during operation. 

Keep Your Gas Fireplace Insert in Top Shape 

Regular maintenance and prompt troubleshooting can keep your gas fireplace insert running efficiently and safely. By following these tips, you can address minor issues before they become costly repairs. However, if you ever feel uncertain or encounter a persistent problem, Fireside’s experienced technicians are here to help. Contact us today to schedule a professional inspection or repair service!