The thermocouple is the small copper rod that the pilot light hits. 1 Answer. Thermocouples eventually wear out and need to be replaced. It's a heat sensor placed next to the pilot flame that signals the gas valve to stay open when the flame is burning. The thermocouple is a device that senses heat and creates a small electric current that tells the gas valve to stay open. The same problem is common with light bulbs in garage door openers. Meanwhile just turn off the gas supply to that heater for safety. Dean If the thermocouple has broken off you will want to dash out to a plumbing or building supplier and buy a replacement one to get your heater going. Burning or pain in your throat usually isn’t a cause for concern. A gas fireplace that is off would not cause other heating systems to stop. If it’s making just barely enough, the gas valve will open, but slowly, creating the gas build-up and the WHOOOMPH! Source(s): Plumber/ gas … 1 decade ago. So I got a new capacitor just like the original one and plugged it into the wall straight from the motor. But a common problem that people with furnaces run into is a pilot light that keeps going out. The thermocouple, which operates as a safety device, turns the gas supply off when the pilot light goes out. Reader Question: Question: why does the pilot flame keep going out on my hot air furnace? It's a safety device that delivers gas from the gas valve to the pilot light. At closing time I turn off the gas lever to the burners, and next morning I go thru the same process again. What are Thermocouple and Pilot Light? Thus, the thermocouple will turn off the patio heater as it tricks the gas value in to thinking that the pilot light is out. You have a thermocouple fitted by the oven burner and this most probably needs replacing. The thermocouple keeps the gas going to the burner by keeping the gas valve open to the oven burner. Bruce, … Two common reasons the pilot light keeps going out are dirt around the pilot area or a problem with the thermocouple. 1 cause of pilot lights that won't stay lit is a worn-out thermocouple. Now it looked good and I ran some wood through it on my shaper and it seemed good. Answer Save. A layer of dirt and grime can hinder the electric current from reaching the thermocouple. (A device called a thermocouple is designed to recognize when the pilot light fails and then shut off the burner as a safety precaution.) The thermocouple's job is to shut a gas safety valve if the pilot light goes out. Note that on some mornings the burners will ignite normally(no flame torch), and stay on, without a problem. Print this page; Share this page × Ad. To check if the coil is grounding to the housing, just put one test lead on one of the coil's paddle terminals and the other lead to the housing itself. Another cause of bulbs burning out is excessive fixture vibration. When it is not lit, the device shuts the gas supply off, preventing any danger and maintaining safety. Why Does My Pilot Light Keep Going Out? The No. It's easy to replace and a new one costs $5 to $10. The ignitor gives a spark between the cap and the plug to light it and the thermocouple is a safety device to keep the gas on while there’s a flame. A furnace control board where the ignitor relay on the control board is stuck closed and keeps the ignitor burning all the time. If you do notice it’s overflowing, use a pipe wrench to open the cap and drain out any liquid. The typical cause for this is that the pilot light flame has become too far away from the thermocouple. A good example of this is a ceiling fan with a light fixture. A lot of gas FPs have 2 sensors; a thermocouple and a thermopile. And that can be a possible reason for your problem if the carbon build up takes place on the thermocouple of the propane light. If both the main flame and the pilot go out, the problem is likely on the side of the thermocouple (could be thermocouple itself, or the solenoid in the main valve). It was the part of the pilot flame normally pointing backwards to the thermocouple tip (and normally hitting it directly) that caused the fireplace to automatically "de-couple" since the thermocouple never got hot – a cold thermocouple means that the fireplace thinks the fire is blown out and it stops the gas inlet for for safety reasons. I was first given this question by a very good customer. Another question we hear a lot from customers is why their gas fireplace or gas fire pit keeps losing its flame or going out completely without and control. As other answers said, make sure your not drawing more amperage than the alternator is rated for. Hob Gas Burners & Thermocouples . The solution: Again, you’ll have to do some cleaning. The area around the light is dirty. So if the fuse keeps burning out, remove the wire connections and take a multimeter to all fuse and thermostat connections for continunity. Relevance. The burners now keep the thermocouple red the entire day, thus keeping my oven working all day long. As you know, carbon is a non-metal substance. This is the pilot flame that provides the heat. We’ll look at each one here. Faulty Thermocouple: The thermocouple, as explained above, exists to sense if the pilot light is lit. You can try a rough-service bulb to correct this problem. When a fan blade becomes unbalanced, the fan starts to shake, and the vibration jiggles the bulb filament and shortens its life. If the furnace pilot light keeps going out, the thermocouple may be deformed or bent. Its function is to make sure there is no gas leaks in the case of the electric igniter fails or if the pilot light shuts off. jim sharp. When a thermocouple fails, the pilot light won't stay lighted. 2. ( 4 years ) But now it seems that the thermal couple in my furnace keeps going bad way more then once a year. thermocouple was replaced on my air furnace - Bruce 11/17/12. After the furnace burns the pilot light goes out also. Thermocouple. Rather than trying to unfasten the thermocouple inside the water heater's burning chamber, it's easier to remove the whole burner and thermocouple assembly. Anonymous . As a result, a small portion of the thermocouple may be prevented from coming into physical contact with the flame. If infinite resistance shows up then it's fine, there's no short. Clicking this will make more experts see the question and we will remind you when it gets answered. As a result, the gas supply will be cut off and the pilot light will go out. I spoke to the factory and they said it was because I was running it from a old 100' extension cord. The thermocouple is a small metal piece that crosses paths with the burning flame of the pilot light. Anything over 125 volts is going to cause premature light bulb failure and furnace ignitor failure. What would cause standing pilot flame to keep going out . Use a load tester on your battery, Have the module that controls the alternator checked. A sore throat is typically caused by a common infection, like a cold or strep throat. This component usually is located not far from the pilot light burner. High home line voltage. It consists of a heat sensor connected to a solenoid; when the sensor is not heated by the pilot flame, the solenoid closes the gas supply line. Another cause of a weak pilot is a faulty thermocouple. I light the oven but it goes out not sure why have double oven and small oven is okay. Check your voltage to see that you are in the 110 to 125-volt range. Thanks . A burned out or broken thermocouple should be replaced. Patio Heater Won't Stay Lit One common issue that patio heater owners face is keeping their patio heater lit. A faulty thermocouple would shut off the gas supply to even a burning pilot light, which would result in cold water for you. Customer reply replied 10 years ago. 3. Favourite answer. Once the thermocouple detects the flame, it opens the gas valve to produce heat for your home. The thermocouple on your fireplace is located right next to the pilot light. The thermocouple on your gas fireplace is a heat-sensitive device that keeps the pilot gas tube open while the pilot is lit. Ask Your Own HVAC Question. If the thermocouple feels the heat from a pilot light, it keeps the gas line open. The number one reason why the pilot light keeps going out is the thermocouple.Either the thermocouple is going bad or it is dirty and needs to be cleaned. If the pilot light goes out, the thermocouple senses a loss of heat and the rod covers the gas valve cutting off the fuel supply. Usually, a problem with the thermocouple causes the pilot light to go out. Therefore, a dirty thermocouple might be the reason why your water pilot keeps going out. So burning propane will lead to carbon build up on the objects nearby. Comment; Flag; More. Some of the main causes for a pilot to go out will be a dirty pilot (doubtful in this case), loose G-bushing (fastener at screw in/ valve side), or a bad thermocouple. No hot water on a cold Monday morning. Level 3: An expert who has achieved level 3 by getting 1000 points. I have replaced 3 this winter alone. The thermocouple is a component of a gas furnace. The thermocouple acts as a safety measure. Mark . That's why it's important to know how to keep a thermocouple clean and in working order. On 2017-01-16 by (mod) thermocouple that keeps fireplace burning has snapped. That's important because gas is always being supplied to the pilot to keep the flame lit. Posted by Anonymous on Oct 12, 2015. Your furnace’s thermocouple is a copper rod that sits next to your furnace burners.It’s often called the “flame sensor” because its job is to detect whether the pilot light is lit or not.If it can’t sense a flame from the pilot light, it prevents the gas valve from opening and … Want Answer 1. The run capacitor keeps burning up in about 4 minutes. Why does my alternator fuse keeps burning out.? Maybe heat causes enough expansion/ movement for something to only work intermittently. Reply: checklist for thermocouple problems. Thermocouples work by producing a small amount of voltage when it is heated. Check all of your connections for cleanliness and security. If it is working properly, the valve will stay open after the pilot has been on for half a minute or so. Usually its because the pilot flame is to high and covers the top of the thermocouple , the top of the thermocouple needs to be clear of flame this is where it dissipates heat, let me know if that is the case. I'm trying to figure out why the valve would suddenly close/ shut gas off to the burner. The ignitor never gets a break and will burn out quickly. The guy had purchased a lot of custom products from us and I really felt bad about his fire pit having problems. 7 Answers. To replace a thermocouple: However, the thermocouples in many older heaters start malfunctioning. Dirt around the pilot light, particularly around the pilot light opening, can cause it to keep going out. An unlit pilot light means that the burners can’t come on and the furnace won’t work. The thermocouple is already above the flame. Because I knew my thermocouple was working fine (since the pilot light would stay lit), I decided to check the output of the thermopile to see how much electricity it was generating. 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