Pilot Light Keeps Going Out? Try This First January 12, 2026 A pilot light that keeps going out can be frustrating, especially when it affects your heating or hot water. While it can sometimes point to a deeper boiler issue, there are a few simple checks that are worth trying first before calling out an engineer. Understanding what might be causing the problem can help you act quickly and avoid unnecessary disruption. Common causes behind a pilot light that will not stay lit In many cases, a pilot light goes out due to a relatively straightforward issue rather than a full boiler failure. Older boilers in particular rely on a steady flame to operate correctly, so even small interruptions can cause the system to shut down as a safety measure. A brief outage or draught may cause the pilot light to extinguish, but if it happens repeatedly, there is usually an underlying reason that needs attention. Before assuming the worst, it is worth checking a few key areas. Check for draughts around the boiler Strong air movement can easily blow out a pilot light, especially if the boiler is installed in a garage, utility room, or near an external door. Even something as simple as a window left open can interfere with the flame. Take a moment to see if there are noticeable draughts around the boiler casing. Reducing airflow or closing nearby openings may be enough to stop the issue from recurring. Inspect the pilot light flame colour A healthy pilot light should burn with a steady blue flame. If the flame appears yellow, weak, or flickering, it may indicate dirt buildup or an issue with gas flow. A discoloured flame can prevent the thermocouple from heating properly, which causes the boiler to shut the gas supply off for safety. This is often an early sign that maintenance or boiler repairs may be required. Try relighting the pilot light safely Most boilers include instructions for relighting the pilot light, usually found on the inside of the boiler panel. Follow these carefully and never force any controls. If the pilot light relights but goes out again shortly after, avoid repeated attempts. Persistent failure often means a component is not functioning as it should and needs professional inspection. Consider the condition of the thermocouple The thermocouple is a small safety device that senses heat from the pilot light. If it cools down, it automatically shuts off the gas supply to prevent leaks. Over time, thermocouples can become worn or misaligned. When this happens, the pilot light may light briefly and then cut out again. A qualified heating engineer in Walsall, Wolverhampton and Cannock can check and replace this part if needed. When to stop troubleshooting and call a professional While basic checks are useful, gas appliances should never be taken apart without the correct qualifications. If the pilot light continues to go out, or if you notice unusual smells, soot marks, or poor heating performance, it is time to seek expert help. Ongoing pilot light problems can be a warning sign of a larger issue that could affect boiler safety and efficiency if left unresolved. Need reliable boiler repairs in Walsall, Wolverhampton and Cannock? Heatfire Ltd provides professional fault finding and boiler repairs carried out by experienced heating engineers who understand both older and modern boiler systems. If your pilot light keeps going out and simple checks have not solved the issue, call us today or fill out our contact form to arrange a visit and restore safe, reliable heating.
