Why does my gas fire keep going out? 3 reasons why and how to fix it

Gas fires are a popular choice for many homeowners. With instant heating, stylish designs, and enhanced safety, it’s obvious to see why. However, like many home appliances, they can run into problems.

At Fires2U, we understand how frustrating it can be when this happens. Our products are made from high-quality materials and go through thorough manufacturing checks before they are approved to minimise the chance of issues.

If you have an old gas fire that keeps going out, however, we have created a list of the potential reasons why.

Common reasons why gas fires go out

Various reasons might be affecting the performance of your fire. It is best to consult a technician to address the root of the problem if you’re unsure. 

Faulty thermocouple

The thermocouple is a safety device that detects whether the pilot light is on. If this is faulty or misaligned, it may incorrectly sense that the pilot light is off and shut down the gas supply.

To understand whether this is the main issue, check if the pilot light goes out after being lit. A major fault will prevent the light from igniting at all, and the flame may fluctuate in size and emit insufficient heat.

Visible signs of wear, corrosion, or damage on the thermocouple can indicate it's time for a replacement.

What to do

This task requires caution and expertise, so it’s best to hire a professional if you don’t feel comfortable or qualified to do so.

Tools: adjustable wrench, screwdriver, new thermocouple, and thread sealant tape.

1. Safety first: Turn off the gas and electricity supply and ventilate the area.
2. Access and identify the thermocouple: Open the appliance access panel and locate the copper or silver tube (thermocouple) that extends from the gas control valve to the pilot light.
3. Disconnect and remove the old thermocouple: Use an adjustable wrench to remove the tube, removing any screws or clips to pull it out of the mounting bracket.
4. Prepare and install the new thermocouple: Apply thread sealant tape to the threaded end of the new thermocouple, straighten out any kinks and insert it onto the mounting bracket. Ensure it is aligned with the pilot light and attach the other end to the gas control valve, securely tightening the nut with an adjustable wrench.
5. Test the installation: Turn on the gas supply and light the pilot light to check if it stays alight and produces enough heat. Use a soap-water solution to check for leaks at the connection points. Bubbles will form if there's a leak.

Gas supply issues

Low gas pressure or a faulty gas valve can interrupt the gas supply, causing the fire to burn out.

If you can smell gas near the fire, hear hissing sounds, or the gas leak detectors activate, you must contact a professional right away to check for safety.

What to do

If there is a gas leak, high gas pressure, a faulty gas valve, or low gas pressure, you need to contact a highly trained professional, as these are too dangerous to attempt to fix yourself. 

However, there are things you can do to diagnose or mitigate the issue:

1. Low gas pressure: Set the gas regulator to the correct pressure and check if it’s functioning correctly. Look for any obstructions in the gas line and contact your gas company to address the issue.
2. Gas leaks: Immediately turn off the main gas supply and open all windows. Contact your gas company or emergency services, and do not attempt to fix the gas leak yourself.
3. No gas supply: Check that the main gas valve is in the 'On' position, and if there is still no supply, contact your gas company for assistance.
4. High gas pressure: Adjust the regulator to a lower setting. If this doesn’t resolve the problem, contact a professional right away.
5. Faulty gas valve: The valve must be replaced if it’s not opening or closing properly. Hire a technician to complete the process.

Blocked ventilation

Poor ventilation can affect the flame as the vents become dirty or blocked, preventing sufficient airflow. 

It can disrupt the balance of oxygen and pressure needed for stable combustion, activate safety mechanisms, and lead to incomplete combustion and overheating, all of which can cause a gas fire to go out.

Excessive moisture on windows, low heat supply, whistling sounds, and carbon monoxide readings are signs of poor ventilation and should be addressed immediately. 

What to do

Efficient ventilation is crucial for the safety and operation of a gas fire. Hire a professional to repair the issue if you aren’t comfortable doing it yourself.

Tools: screwdriver, adjustable wrench, a vacuum cleaner with a hose attachment, soft brush, soap and water, and a lint-free cloth.

1. Turn off the appliance and ventilate the area: Ensure the gas is off and open all windows and doors.
2. Inspect internal components: Inspect the appliance access panel for dust, cobwebs, or soot and clean it with a vacuum cleaner and cloth.
3. Check the flue: Search for signs of blockage or corrosion and contact a professional to address them.
4. Clean the fan and replace the filters: Make sure the fan is working efficiently, and clean or replace any dirty air filters.

Turn on the appliance and check for drafts: After reassembling the appliance, turn on the gas and check for efficient airflow from the vents. Use a carbon monoxide detector to ensure it is safe to use.