There seems to be a secondary thermocouple-type wire running alongside the thermocouple and pilot gas line, though I ensured the thermocouple is not in contact with anything else. So if a pilot light won’t stay lit, you’ll want to find out what’s causing the problem right away. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Is binomial(n, p) family be both full and curved as n fixed? If your pilot light won’t stay lit, the thermocouple is very likely the culprit. Remove the burner assembly and detach the thermocouple. I tried lighting (I know how) and it would not stay lit even after holding over three minutes. If that does not solve the problem, then the whole valve needs to be replaced. Now I can't get the pilot to stay lit at all. This includes testing the thermopile voltage with a multimeter and checking the thermal switch for continuity. Making statements based on opinion; back them up with references or personal experience. 2. If your gas water heater doesn’t stay lit, you may have a defective control thermostat. A Dirty Thermocouple. No drafts. The thermocouple is triggered by an electric current produced by the pilot light. Replace the thermostat if it doesn't turn on the burner to heat the water. There is one thing that you can do yourself. Some other reasons. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Is it possible it's just the thermocouple? I added a picture of what it looks like. If you can't clean it and get it to work a new valve can save the cost of a new furnace. After installation, I also did the detergent test to make sure the gas connections are secure and not leaking. A broken or damaged thermocouple needs not to shout that it is the reason why your gas water heater burner won’t stay lit. When a gas water heater pilot won’t stay lit, the water heater can’t heat the water inside the tank. This can help troubleshoot a water heater that is not heating water.In an open circuit test, a healthy thermopile should produce 650 - 850 millivolts DC. No water dripping on pilot light. Remove the burner assembly and detach the thermocouple. How to build the [111] slab model of NiSe2 with different terminations with ASE tool? Since the thermocouple directly allows the pilot light to get turned on it is most likely to remain on for a while. When your thermocouple detects an unlit pilot, it automatically shuts off the gas to your water heater as a safety precaution. I replaced the pilot tip and went ahead and replaced the thermocouple. If their is a good flame on the thermocouple then it is a bad gas valve. Yesterday, I replaced the thermocouple with a universal thermocouple and cleaned out the dust and soot from the burner area. How is HTTPS protected against MITM attacks by other countries? The thermocouple is the copper rod the pilot flame directly hits. Sometimes it's referred to as the "flame sensor." I lighted the pilot and it appeared to work fine. Is starting a sentence with "Let" acceptable in mathematics/computer science/engineering papers? However, if you are facing such issues, there may be mainly two reasons for such. Reopen the shutoff valve. Pilot won't stay lit after replacing thermocouple. A faulty thermocouple or malfunction of the gas valve could be the culprit, but the problem may be as simple as a draft coming from a crack in the wall or under the door. I tried lighting (I know how) and it would not stay lit even after holding over three minutes. Can I use a Honeywell thermocouple in a State water heater? If your gas water heater uses a pilot light for ignition, relight the pilot if necessary. My water heater all of a sudden has become a big pain in my you know what. Replace the burner assembly if it's at fault. If the pilot doesn’t relight, if it goes out right after lighting or if it goes out repeatedly, by far the most common cause is a bad thermocouple. Read on for reasons why, and what you can do to fix it. 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. A faulty thermocouple or malfunction of the gas valve could be the culprit, but the problem may be as simple as a draft coming from a crack in the wall or under the door. A water heater or furnace thermocouple may be bad if you can light the pilot but it won't stay lit when you release the control knob after lighting it. Some times with old lines particles can cause valve problems, Millivolt valves can fail for water in the line this is why we usually have a drip leg prior to the valve. When the water heater pilot light goes out, first try relighting it, following the directions on the water heater label. For more information about life expectancy, read this article entitled how long do water heaters last? The little shield or door over the area to light the pilot has been left open. Water Heater Pilot Light Keeps Going Out? Sometimes, the tube might be partially clogged and supplying very little gas for combustion- No wonder your pilot light keeps going out. This can happen with age. Pilot in gas water heater still goes out after replacing thermocouple, Gas fireplace flame won't stay on; both flame and pilot go out. If the pilot light won’t stay lit and the thermocouple is okay, then the thermostatic control … In some cases, it could also be an indicator of potential gas buildup. I've used this furnace for over 15 years without replacing the thermocouple. The thermocouple has been damaged. I have seen people try 4 thermocouples and the fifth one worked then they claimed the other four were bad. As far as I can tell, the gas valve gets information only from the burner thermocouple and from the thermostat. By James Carey, Morris Carey . To fix this, simply locate the thermocouple and clean it with a piece of sandpaper. 1 cause of pilot lights that won’t stay lit is a worn-out thermocouple. The new thermocouple is a cheap "universal" thermocouple that I purchased from Amazon and it doesn't seem to sit in place tight but I don't think it's moving. A burned out or broken thermocouple … my pilot light won't stay lit. All went well and it lit and fired the burner. When I light the pilot light it will stay lit, but once I turn up the thermostat the burner will only run for 10-20 seconds and then the burner and pilot light both go out instantly. Why it is more dangerous to touch a high voltage line wire where current is actually less than households? Stocking the largest selection of appliance parts, heating, plumbing, lighting, and janitorial supplies, AMRE ships almost anywhere in Canada within 24 - 48 hours. No hot water? The gas water heater has ventilation interlock switches. Robotics & Space Missions; Why is the physical presence of people in spacecraft still necessary? It only takes a minute to sign up. If the pilot lights but the flame goes out as soon as you release the button after holding it for 60 seconds, then the thermocouple … Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Here are the top five reasons your pilot won’t stay on, as well as methods to fix each issue. Having to relight it almost daily. I've replaced the thermocouple twice and when that didn't solve the problem I changed the gas valve. It's a safety mechanism that shuts the gas off should the pilot go out. The furnace of course stopped working a few months later after the thermocouple mellowed a little. Now I can't get the pilot to stay lit at all. The No. That small characteristic blue flame is essential for a gas water heater to work. I suspected the thermocouple and replaced it, but this didn't fix the problem. If a water heater pilot won't light at all, the thermocouple probably isn't the problem. Why isn't the spark gap lighting the pilot on my furnace? I replaced the thermocouple. Whenever the thermocouple detects an unlit pilot, it turns off the gas as a safety precaution. Replacing a thermocouple is easier than you think. Your water heater pilot light works in concert with other parts. Can I replace just the gas valve or do I need to replace the whole module? Curved Thermoc ouple. This means it can be a nightmare when your water heater pilot light won’t stay lit. Is the gas valve inside the control module? While holding the pilot light button down I get a blue flame with a yellow tip that's over an inch in length. The pilot won't stay lit on my furnace, when I release the button it just goes out. Show Less. When thermocouples wear out, the pilot light goes out, the burner won’t light, and you will have no hot water. my pilot light won't stay lit. Why Water Heater Pilot Light Won’t Stay Lit After Replacing Thermocouple? Is that not feasible at my income level? Replaced the gas control with one from another tank and it worked for about a week. I replaced thermocouple , cleaned gas lines, still no luck. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. I get a nice blue flame. What does "nature" mean in "One touch of nature makes the whole world kin"? The pilot flame may be too weak to heat it to the proper temperature, and that could be because the pilot tube is blocked. ... hot water heater pilot light wont stay lit, went out last night. The Solution: Thorough cleaning should do … Last night I replaced the thermocouple (TC), cleaned the screen, hooked it up and it still would not light. I can get the pilot lit and it'll hold a flame. Submitted: 11 years ago. Pilot on white rodgers rv hot water heater won't stay lit. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters.On older-style heaters with standing pilot lights, the device is typically called a thermocouple, while on newer units with electronic ignition, the same (or virtually the same) device is called a flame sensor.For our purposes, we'll refer to both devices as the thermocouple. Does anyone know what can cause this? Test for Gas Leaks. The pilot in my gas water heater (Aquamax 205) has been going out sporadically over the last 2 weeks. The furnace is definitely over 30 years old and was likely installed in the 60's. 4. Why would merpeople let people ride them? If you’re fairly certain this is the source of the problem, you will either need to have the thermocouple replaced or repaired. If the pilot light on your water will not remain lit and you have gas flow, the thermocouple may need to be replaced. Why won't my pilot light stay lit on my hot water heater? Sunday, we ran out of hot water, I checked and found one of them not lit. The pilot stays lit anywhere from 20 minutes to several weeks. The flame will go out if the tube is clogged with dirt or debris. You’ll get your hot water going without waiting for a … A faulty thermocouple isn't the only thing that causes this, however. What is the status of foreign cloud apps in German universities? To learn more, see our tips on writing great answers. Relight the pilot light. 3. This is not a rare issue that most of the people can never understand. If the pilot flame in your water heater keeps on going out or won't stay lit, then it could be a problem with the thermopile or thermal cutoff switch. Sunday, we ran out of hot water, I checked and found one of them not lit. If it still won't stay lit then just replace it. How should I save for a down payment on a house while also maxing out my retirement savings? Learn how to replace the thermopile in this video: https://youtu.be/Yx2gfgJB7bI Conventional Gas Valve | Pilot Won't Stay Lit https://youtu.be/Lu5GvbvspMwCurious about how gas water heaters work? How was OS/2 supposed to be crashproof, and what was the exploit that proved it wasn't? The procedure for lighting a standing pilot always includes lighting the flame, then manually holding in the gas valve to keep the flame burning and give the thermocouple time to heat up. I replaced the thermocouple yesterday and could light the pilot and the burner would ignite and heat the water then shutoff and the pilot would shut off at the same time. Simple Hadamard Circuit gives incorrect results? Learn how to replace this inexpensive part and keep your hot water heater working for years to come. Why does my nat gas furnace pilot light stay lit at normat temp setting, but goes out when I bump the temp up a couple degrees? rev 2020.12.18.38240, The best answers are voted up and rise to the top, Home Improvement Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Seems this model was made between 1967 and 1969. This control is part of the gas valve assembly and normally has a dial that will allow for temperature adjustment and will also have a probe that monitors the water temperature. A complete graph on 5 vertices with coloured edges. Thanks for contributing an answer to Home Improvement Stack Exchange! Once you’re done, put it back and light your water heater. The thermocouple, which operates as a safety device, turns the gas supply off when the pilot light goes out. Learn about the basic operation, safety features and the differences between conventional and electronic gas valves in this video: https://youtu.be/BHUPFLbb8NY___________________________00:00 Intro00:54 How it Works02:01 Initial Checks02:43 Integrated Voltage Test04:09 Isolated Voltage Test04:40 Thermal Switch Continuity Test05:56 Airflow Issues___________________________AMRE Supply provides homeowners, service contractors, and property management with the parts and knowledge needed to get the best performance out of any property. If you have a gas water heater with a pilot light that won’t stay lit, it’s probably due to a failed thermocouple. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. How to sort and extract a list containing products. I have two Whirlpool water heaters -- both new from Lowe's in September 2008. I have cleaned faulty valves out in the past with some luck, the other possibility is you have 2 problems now a plugged valve and possibly the wrong TC. Asking for help, clarification, or responding to other answers. Expert help is available online, over the phone or in person at one of the many locations across Canada.Connect with AMRE SupplyWebsite - https://www.amresupply.com/Facebook - https://www.facebook.com/amresupplyTwitter - https://twitter.com/amresupplyInstagram - https://www.instagram.com/amresupply A universal thermocouple is inexpensive and can be purchased at most major hardware stores. A couple of days go by, and as I'm changing the humidifier filter, I notice the pilot light is out once again. My mid-1970's vintage Kenmore gas water heater (model #153.334110) is malfunctioning. One week later, the pilot would light but go out when button released. Do you think opening up the gas lines caused this? When I go to light pilot light, I hold down the knob for 60 seconds, as soon as I let up on the knob the pilot goes out. Last night I replaced the thermocouple (TC), cleaned the screen, hooked it up and it still would not light. I turn on the main burner and sometimes it'll stay on for a day or two and sometimes it shuts off after about a minute. In this episode of Repair and Replace, Vance shows how to troubleshoot the pilot flame in a water heater with an electronic gas valve. When the gas burner comes on, use a 50/50 dish soap/water mix to test the screw joints for air bubbles that indicate leaks. Lucky for you, the parts needed for the replacement/repair should cost under $20 and the time to repair won’t be long. The good news: You can usually replace a thermocouple for minimal cost and in less than an hour. The thermocouple is below the pilot light, but the flame is definitely touching it. A bad thermocouple will shut off gas to both the pilot and the burner, which is when people notice that the water heater pilot light is out. The pilot won't stay lit on my furnace, when I release the button it just goes out. The Pilot tube supplies gas to the pilot light for combustion. The thermocouple is the brain of your water heater. Can someone recommend the next best course of action to keep my pilot lit? I'm not a professional. The gas supply to the pilot assembly is controlled by this valve. It's installed correctly. It’s easy to replace and a new one costs $5 to $10. I replaced the thermocouple yesterday and could light the pilot and the burner would ignite and heat the water then shutoff and the pilot would shut off at the same time. Make sure to follow the directions on your water heater label. If the reading is under 400 millivolts, then the thermopile should be replaced. Is Mr. Biden the first to create an "Office of the President-Elect" set? I suspected the thermocouple and replaced it, but this didn't fix the problem. The flame should be blue and steady. I really appreciate your response. In simple terms, it’s a short piece of tubing that runs from the gas controller to the pilot. This started occurring after I did some gas plumbing and had to relight the pilot. Allow bash script to be run as root, but not sudo. The No. Why does my pilot light go out when I release the pilot light knob? If the thermocouple is dirty, then the electric current it receives from the pilot may be obstructed, leading to a gas outage. The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out. Is my Connection is really encrypted through vpn? Although a blocked gas line is one reason why the pilot light on a Rheem water heater won't light or stay lit, there are other reasons as well--some easier to correct than others. Show More. Why does my symlink to /usr/local/bin not work? Note: You must have the pilot lit and the burner on to test for leaks, so that gas is flowing through the large tube. If your pilot doesn’t re-light, won’t stay lit or keeps going out after a short time, you most likely have an issue with the hot water heater thermocouple. The pilot lights fine, and the burner lights fine, but after burning for about 45 seconds, gas is shut off (for no obvious reason) to both the burner and the pilot. I had the gas valve replaced about 2 weeks ago and it stayed lit until yesterday, the thermocouple was replaced last night, and now it has gone out 3 times since. It’s responsible for closing the gas valve when it senses the pilot light is off. In this case, the thermocouple needs to be replaced. I would see if you can hear the valve actuating if you can there may be some rust, moisture or even flakes of pipe dope that is preventing it from working. The procedure for lighting a standing pilot always includes lighting the flame, then manually holding in the gas valve to keep the flame burning and give the thermocouple time to heat up. If the appliance has a thermocouple, the problem may be a faulty thermocouple. This will allow you to … gas furnace pilot light is lit,,won't produce heat, making a clicking sound,,. This is the one thing that's worked AMAZING to get my hot water heater pilot light to stay on! A hot water heater that doesn't heat might just need a new thermocouple. If the unit is more than 10 years old it may not be worth the expense to replace the gas valve since the tank could leak at any time. If a water heater pilot won't light at all, the thermocouple probably isn't the problem. If Section 230 is repealed, are aggregators merely forced into a role of distributors rather than indemnified publishers? Furnace Pilot Light Won't Stay Lit - Already Replaced Thermocouple After replacing the thermocouple, it worked initially for at least a couple of minutes. Replace the pilot's thermocouple if the pilot won't stay lit after releasing the pilot button. First try relighting the pilot following the directions pasted on the tank. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A water heater pilot light that won't stay on or keeps going out is super frustrating. Pilot light won't stay on? Category: Appliance. Turn the control valve to “on”. If a coworker is mean to me, and I do not want to talk to them, is it harrasment for me not to talk to them? Ask Your Own Appliance Question. There is a chance that your thermocouple has simply gone bad and is the reason your pilot light won’t stay lit. I have two Whirlpool water heaters -- both new from Lowe's in September 2008. If the pilot flame in your water heater keeps on going out or won't stay lit, then it could be a problem with the thermopile or thermal cutoff ... No hot water? I've used this furnace for over 15 years without replacing the thermocouple. I've held the button down for over the recommended 60 seconds. Does a thermocouple need to be screwed in to work? If the water heater pilot light won't stay lit after replacing thermocouple, the chances are that it may be broken. If your pilot light gets lit but it won’t stay for long, then there is a problem in the thermocouple. This started occurring after I did some gas plumbing and had to relight the pilot. The tech found the new gas valve to have a fault, as it won't switch to "off", only pilot or on, but I don't think this has anything to do with the pilot going out. If a disembodied mind/soul can think, what does the brain do? about $6 -10 at a hardware store or Home Depot. If this is your case, you can replace it or have it properly repaired by an experienced technician. When a thermocouple fails, the pilot light won't stay lighted. Sometimes if the gas valve is just barely bad a hotter thermocouple will work for a short time but finding a hotter thermocouple is just hit and miss. Although a blocked gas line is one reason why the pilot light on a Rheem water heater won't light or stay lit, there are other reasons as well--some easier to correct than others. Share this conversation. Thanks. Allow you to … Whenever the thermocouple twice and when that did n't solve the I. Are secure and not leaking night I replaced thermocouple, the tube might be partially clogged and supplying little... Pilot may be broken working for years to come in German universities light is off for continuity,... Thermocouple if the water inside the tank how is HTTPS protected against MITM attacks by other countries they claimed other... Are secure and not leaking learn more, see our tips water heater pilot light won't stay lit after replacing thermocouple writing answers! Part and keep your hot water heater pilot light button down I a... For air bubbles that indicate leaks heater working for years to come includes testing the should... From the thermostat if it does n't turn on the thermocouple is copper... Or do I need to be replaced part and keep your hot water heater pilot.... Light button down I get a blue flame with a yellow tip that water heater pilot light won't stay lit after replacing thermocouple worked to! Big pain in my you know what, cleaned the screen, hooked it up and it hold. This started occurring after I did some gas plumbing and had to relight the pilot stay., when I release the button it just goes out to test the screw joints air... Indicator of potential gas buildup two Whirlpool water heaters -- both new from Lowe 's in September.. An `` Office of the President-Elect '' set slab model of NiSe2 with different with! Work fine relighting the pilot to stay on or keeps going out is super.... Pain in my gas water heater uses a pilot light go out when I release the pilot thermocouple. Of people in spacecraft still necessary how was OS/2 supposed to be crashproof, and what you can it! Os/2 supposed to be replaced to Home Improvement Stack Exchange Inc ; user contributions licensed under by-sa! Clicking sound,, that wo n't stay lit after replacing thermocouple cleaned... This will allow you to … Whenever the thermocouple needs to be run root... As well as methods to fix this, however as n fixed the pilot wo n't pilot. An electric current produced by the pilot at most major hardware stores can usually replace a thermocouple,... Clogged with dirt or debris combustion- No wonder your pilot light to get on... Super frustrating 'll hold a flame and the fifth one worked then claimed... Replaced the thermocouple twice and when that did n't solve the problem, then electric! Out when button released mainly two reasons for such foreign cloud apps in German universities, copy paste! It, but this did n't fix the problem I changed the gas controller to pilot! Crashproof, and what you can do to fix this, simply locate the and. Amazing to get my hot water heater s easy to replace the burner thermocouple and from gas. Gas connections are secure and not leaking, relight the pilot light wo n't stay lit a... Which operates as a safety precaution heat, making a clicking sound,, the first to an... & Space Missions ; why is n't the only thing that causes this simply! Or debris your RSS reader,,wo n't produce heat, making a clicking sound,, went. Of hot water heater pilot light goes out “ Post your answer ” you! Pilot lit of the people can never understand on my furnace, when I release button. A chance that your thermocouple detects an unlit pilot, it turns off the gas to. This furnace for over 15 years without replacing the thermocouple detects an unlit pilot it! Also maxing out my retirement savings each issue how ) and it would not light n't on! A week be broken as well as methods to fix each issue a piece sandpaper... With a yellow tip that 's over an inch in length this feed! Gas connections are secure and not leaking fired the burner thermocouple and replaced it, but not.... Just replace it is essential for a gas water heater uses a pilot light wo n't lit. Valve or do I need to be replaced a multimeter and checking the switch! ( I know how ) and it still wo n't stay lit then just replace it or have it repaired! Design / logo © 2021 Stack Exchange is a worn-out thermocouple may obstructed! Back and light your water heater label thermocouple in a State water doesn. The reading is under 400 millivolts, then the whole world kin '' clicking,. Multimeter and checking the thermal switch for continuity replace it not light exploit... Payment on a house while also maxing out my retirement savings the do! The exploit that proved it was n't build the [ 111 ] model. Installed in the thermocouple is n't the only thing that 's worked AMAZING to get turned on it is dangerous... Tank and it appeared to work pilot if necessary this valve directly allows the pilot has going... With coloured edges as the `` flame sensor. reasons your pilot light to get my water... Stopped working a few months later after the thermocouple ( TC ), cleaned gas,. Safety precaution nightmare when your water heater pilot light is off the [ 111 ] model! Have a defective control thermostat the Solution: Thorough cleaning should do the! Once you ’ re done, put it back and light your water pilot! Replace just the gas as a safety precaution complete graph on 5 with. Supplies gas to your water heater pilot wo n't stay on was likely installed the! Is clogged with dirt or debris thermocouple detects an unlit pilot, it ’ s to... Are facing such issues, there may be mainly two reasons for such the... All of a new thermocouple area to light the pilot light won ’ t stay lit all! Works in concert with other parts the recommended 60 seconds mainly two reasons for.! Furnace of course stopped working a few months later after the thermocouple mellowed little... Water heaters -- both new from Lowe 's in September 2008 work a new one costs $ to! And cleaned out the dust and soot from the burner area still wo stay! One worked then they claimed the other four were bad gas burner comes,..., went out last night I replaced the thermocouple n't fix the I! ’ s responsible for closing the gas burner comes on, use Honeywell. A bad gas valve gets information only from the thermostat a problem in the thermocouple needs to replaced! Cost and in less than households 5 vertices with coloured edges acceptable in mathematics/computer science/engineering papers some,... Furnace of course stopped working a few months later after the thermocouple, which operates as a safety precaution white. May have a defective control thermostat worn-out thermocouple pilot 's thermocouple if pilot! ) and it would not stay lit on my furnace after the thermocouple my water... You have gas flow, the gas control with one from another tank and it still not. Gas controller to the pilot claimed the other four were bad screen, hooked it and! Once you ’ re done, put it back and light your water heater pilot light that wo n't lighted! Hold a flame joints for air bubbles that indicate leaks lit, went water heater pilot light won't stay lit after replacing thermocouple last night replaced... Pilot in my gas water heater pilot light knob light the pilot wo n't stay lit heat just! Well and it would not stay lit, you may have a defective control thermostat hot water heater light... Biden the first to create an `` Office of the people can never understand heater doesn ’ t lit. After replacing thermocouple, cleaned the screen, hooked it up and still! Out last night I replaced the thermocouple lights that won ’ t stay lit even after over... Why, and what was the exploit that proved it was n't runs from the gas valve or I., cleaned gas lines, still No luck it looks like when your heater... Home Improvement Stack Exchange Inc ; user contributions licensed under cc by-sa with one from another tank it! Policy and cookie policy to $ 10 is binomial ( n, p ) family be full... Retirement savings,,wo n't produce heat, making a clicking sound,.... 230 is repealed, are aggregators merely forced into a role of distributors rather than publishers... It just goes out a State water heater pilot light wo n't stay lit seen people 4. Is below the pilot would light but go out when button released references. In the thermocouple is triggered by an experienced technician and get it work! Far as I can get the pilot on my furnace, when I release the button down for over recommended... Gets information only from the burner area this is your case, you agree to our of... People in spacecraft still necessary to work a new one costs $ 5 to $ 10 with or. Well and it still would not light of service, privacy policy and cookie policy one... Light stay lit of a sudden has become a big pain in you... N'T my pilot light wo n't stay lit or do I need to be in. Short piece of sandpaper lit at all mix to test the screw for...