Furnace Pilot Light Problems: Why It Keeps Blowing Out
Hey guys! Dealing with a furnace that just won't keep its pilot light lit can be super frustrating, especially when those cold prairie winters hit hard. If your furnace pilot light keeps blowing out, you're in the right spot. Let's troubleshoot this common issue. We'll explore why your furnace pilot light might be giving you trouble and how to get it sorted. A furnace that works perfectly for months and then suddenly quits can be a real headache. Understanding the potential causes is the first step to fixing it. Let's dive into why your pilot light might be acting up and what you can do about it.
Understanding the Pilot Light System
First off, let's talk about how the pilot light system works. The pilot light is a small flame that continuously burns in your furnace. Its job is to ignite the main burners when your thermostat calls for heat. This continuous flame is crucial for the furnace to operate correctly. The pilot light system includes several key components, such as the gas valve, thermocouple or flame sensor, and the pilot light assembly itself. Each of these parts plays a vital role in ensuring the pilot light stays lit and the furnace functions as it should. When any of these components malfunction, it can lead to the pilot light going out, leaving you in the cold. So, before we get into troubleshooting, it's important to understand these components and how they interact to keep your home warm. The pilot light system ensures that when the thermostat signals for heat, the main burners ignite safely and efficiently. Think of it as the spark that starts the engine of your furnace. Without a properly functioning pilot light, the entire heating system can grind to a halt. Keeping this system in good shape is essential for reliable heating, especially during those harsh winter months.
Common Causes for a Pilot Light Blowing Out
So, why does your pilot light keep blowing out? There are several common culprits we can investigate. These issues range from simple fixes to more complex problems that might require professional help. Understanding these potential causes is crucial for diagnosing and resolving the issue effectively. We'll start with the most common and easiest to check, then move on to the more intricate possibilities. By systematically exploring these causes, you can often pinpoint the exact reason your pilot light is failing to stay lit. Let's get into the nitty-gritty of what might be going wrong with your furnace. Remember, safety first! If you're not comfortable working with gas appliances, it's always best to call a qualified technician.
1. Dirty Pilot Light Orifice
One of the most frequent reasons for a pilot light to extinguish is a dirty orifice. The orifice is a small opening that allows gas to flow to the pilot light. Over time, dust, debris, and carbon deposits can accumulate in this tiny opening, restricting the gas flow. This reduced gas flow can cause the pilot light flame to become weak and unstable, making it susceptible to being blown out by drafts or slight pressure changes. To resolve this, you'll need to clean the orifice. First, turn off the gas supply to your furnace. Then, locate the pilot light assembly and carefully remove the orifice. Use a thin wire or a specialized orifice cleaning tool to gently clear any obstructions. Avoid using anything too abrasive that could damage the orifice. Once cleaned, reassemble the pilot light and turn the gas back on. Relight the pilot and see if the issue is resolved. Keeping the orifice clean is a simple yet effective way to ensure a consistent and stable pilot light flame, preventing it from blowing out unexpectedly. Regular maintenance, such as cleaning the orifice annually, can help avoid this problem and keep your furnace running smoothly.
2. Faulty Thermocouple or Flame Sensor
Another common reason your pilot light might be failing is a faulty thermocouple or flame sensor. The thermocouple is a safety device that detects the presence of the pilot light flame. When the pilot light is lit, the thermocouple generates a small electrical current that keeps the gas valve open, allowing gas to flow to the main burners. If the thermocouple is dirty, bent, or damaged, it may not generate enough current to keep the gas valve open. This will cause the gas valve to close, extinguishing the pilot light. Similarly, some newer furnaces use a flame sensor instead of a thermocouple. The flame sensor works on the same principle, detecting the presence of the flame and ensuring the gas valve stays open. To troubleshoot this, first, inspect the thermocouple or flame sensor for any visible damage or dirt. Clean it gently with fine steel wool or a specialized cleaner. Make sure it is properly positioned in the pilot light flame. If the problem persists, the thermocouple or flame sensor may need to be replaced. This is a relatively inexpensive part, and replacing it can often resolve the issue of a pilot light that keeps going out. Ensure you get the correct replacement part for your specific furnace model to guarantee proper functionality.
3. Gas Pressure Issues
Gas pressure issues can also be a significant factor in a pilot light that won't stay lit. If the gas pressure is too low, the pilot light flame may be too weak to stay lit consistently. Conversely, if the gas pressure is too high, it can cause the flame to be erratic and unstable, leading to it being blown out. These pressure problems can stem from various sources, including issues with the gas regulator, problems with the main gas line, or even issues with the gas company's supply. To check for gas pressure issues, you'll need a manometer, a tool that measures gas pressure. Connect the manometer to the test port on your gas valve and measure the pressure while the furnace is running. Compare the reading to the manufacturer's specifications for your furnace model. If the pressure is outside the specified range, you'll need to adjust the gas regulator. This adjustment should be done by a qualified technician, as incorrect adjustments can be dangerous. Low gas pressure can also be caused by a partially closed gas shut-off valve or a kink in the gas line. Ensure all gas valves are fully open and inspect the gas line for any obstructions. Addressing gas pressure issues requires careful diagnosis and precise adjustments to ensure the pilot light receives the correct amount of gas, maintaining a stable and reliable flame.
4. Drafts
Drafts can be a sneaky culprit behind a pilot light that keeps sputtering out. Even a small draft can be enough to extinguish the delicate flame of the pilot light. These drafts can come from various sources, such as leaky windows, poorly sealed doors, or even the furnace's own venting system. To identify drafts, start by carefully inspecting the area around the furnace for any obvious sources of air movement. Hold a lit candle or a piece of tissue paper near potential draft sources and watch for any movement. Seal any gaps or cracks you find with weather stripping or caulk. Check the furnace's venting system to ensure it is properly sealed and that there are no leaks. Make sure the vent pipes are securely connected and that there are no holes or gaps. If your furnace is located in a utility room, ensure the door is properly sealed to prevent drafts from entering. Additionally, consider the placement of the furnace itself. If it's located near a frequently opened door or window, relocating it might be necessary to prevent drafts from affecting the pilot light. Addressing drafts is a simple yet effective way to ensure a stable and reliable pilot light, keeping your furnace running smoothly.
5. Blocked Venting System
A blocked venting system can also cause the pilot light to go out. The venting system is responsible for removing exhaust gases from the furnace. If the venting system is blocked, these gases can back up into the furnace, causing the pilot light to extinguish. Blockages can be caused by debris, such as leaves, nests, or other obstructions that accumulate in the vent pipes. To check for blockages, start by visually inspecting the vent pipes outside your home. Look for any obvious signs of obstruction, such as debris or damage. If possible, remove the vent cap and use a flashlight to look inside the vent pipe. If you see any blockages, try to remove them with a long brush or a vacuum cleaner. Be careful not to damage the vent pipes while doing so. Additionally, check the vent pipes inside your home, ensuring they are properly connected and free from obstructions. Make sure the vent pipes are sloped correctly to allow for proper drainage of condensation. If the venting system is severely blocked or damaged, it's best to call a qualified technician to inspect and repair it. A properly functioning venting system is essential for the safe and efficient operation of your furnace, preventing exhaust gases from backing up and causing the pilot light to go out.
Checking the Nordyne M1GH 077A AW Model Specifics
Since you mentioned you have a Nordyne M1GH 077A AW downdraft furnace, it's worth checking for any model-specific issues. Some furnaces have quirks or common problems unique to their design. Consult the furnace's manual for any troubleshooting tips specific to this model. You might find that there's a known issue with the pilot light assembly or gas valve that's been documented by the manufacturer. Online forums and appliance repair websites can also be valuable resources. Search for discussions about the Nordyne M1GH 077A AW model to see if other users have experienced similar problems with the pilot light. They may have found solutions or workarounds that you can try. Checking for model-specific issues can sometimes provide a quick and easy fix, saving you time and effort in troubleshooting. If you can't find any specific information about your model, don't hesitate to contact a qualified technician who is familiar with Nordyne furnaces. They may have encountered the issue before and can quickly diagnose and resolve the problem.
When to Call a Professional
While many pilot light issues can be resolved with some DIY troubleshooting, there are times when it's best to call a professional. If you're uncomfortable working with gas appliances, or if you've tried the above steps and the pilot light still won't stay lit, it's time to call a qualified technician. Gas leaks can be dangerous, so if you suspect a gas leak, evacuate the area immediately and call your gas company or the fire department. Additionally, if you notice any unusual smells or sounds coming from your furnace, it's best to have it inspected by a professional. They have the tools and expertise to diagnose and repair complex furnace problems safely and effectively. Calling a professional can also save you time and money in the long run. They can quickly identify the root cause of the problem and prevent further damage to your furnace. Don't hesitate to seek professional help when needed to ensure the safety and proper functioning of your heating system.
Final Thoughts
Dealing with a furnace pilot light that keeps blowing out can be a real pain, but with a systematic approach, you can often identify and resolve the issue yourself. Remember to prioritize safety and consult a professional when needed. Keeping your furnace in good working condition is essential for a warm and comfortable home, especially during those cold winter months. Good luck, and stay warm!