Corrosion and buildup are some of the things that can affect a thermocouple. What is the difference between the Type J and Type K thermocouple? 3 Disconnect Everything From The Heater. Alternatively, you can use a small piece of sandpaper to clean the thermocouple. Replace the burner access cover and secure as needed. Otherwise, remove the gasket and plan to buy a replacement. 4. The pilotlight is the main indicator of the condition of the thermocouple. They’re accurate at their stated temperatures and are inexpensive. It’s hard to achieve a system error of less than one degree Celsius. But before you conclude, first be sure it not merely dirty. Sometimes when the thermocouple breaks down you may think that the water heater needs replacement. Now the ends of thermocouple may be corroded. This pilot light heats a thermocouple which generates a small voltage (up to 30 millivolts). To tell you how to clean the thermocouple on a water heater. thermocouple; Cleaning Steps. The thermocouple is a safety device located by the pilot light on your furnace. One main difference between a thermocouple and an RTD is that thermocouples are more sensitive and respond faster. In simple terms, it’s a short … Be aware, you may need to detach a pilot supply tube as well. This can happen if you have a weak gas control magnet or if the thermocouple needs to be replaced. $16.30 $ 16. Use a pencil eraser to clean between the threads of the screw that attaches the thermocouple. Assuming you have checked the thermocouple and it’s intact, another possibility … add to cart. I read most common issue is thermopile or thermocouple issue. Before you begin, be sure to unplug the water heater’s power cord and shut off the gas supply. A hot water heater that doesn't heat might just need a new thermocouple. To clean the thermocouple in a water heater is an important maintenance procedure. A Broken Thermocouple. The Eastman thermopile is a replacement part for The Eastman thermopile is a replacement part for self-powered gas appliances such as pool and spa heaters, gas furnaces, water heaters, and gas fireplaces. There are many types of thermocouples that are best suited for the application they are created for. How does this happen? This 36 in. Use a lint-free cloth to wipe the component clean of any remaining debris. To find out more or to change your cookie settings, visit the cookies section of our privacy policy. 5.0 out of 5 stars 1. Therefore, if the pilot light won’t stay on, the thermocouple could be the problem. Insuffi cient combustion air – follow steps on pp 18 -19. Thread and tighten the mounting nuts or screws to secure the burner plate to the tank. If you have a gas water heater with a pilot light that won’t stay lit, it’s probably due to a failed thermocouple. Use a piece of steel wool or the abrasive side of a sponge to gently remove the soot without damaging thermocouple. Turn off the power to your hot water heater so that you do not risk becoming injured while cleaning the thermocouple. Hopefully, you can get to the ends of the thermocouple without having to detach it from the assembly, but you may have to do that. The solution was adjusting the thermocouple. The end result is the burner assembly doesn’t produce a flame and the water in the tank is left unheated. If it is not too old hen you can try cleaning the orifice and see how it goes. Gas water heaters which use a pilot to light the burner will also have a thermocouple or thermopile to monitor the pilot (a thermopile is, essentially, multiple thermocouples connected in a series making the component more sensitive than a single thermocouple). They can prevent power from reaching the pilot light, thus the water won’t heat up. They are joined together at the tip (Hot Junction). Turn off the power to your hot water heater so that you do not risk becoming injured while cleaning the thermocouple. add to cart. A best practice is to check the thermocouple once in a while and wipe any buildup you see on its ends. ), the source of the problem, the cost for new parts, and labor rates in your area. Turn off the gas leading to your water heater. Turn the gas supply back on and plug the water heater power cord back in. Sand the ends of the thermocouple … Most units will have an inline valve for the gas inlet, but you can turn off the main gas line if one is not available. Close the control gas valve to the water heater and turn on the button at the top of the temperature control valve on Off. You can even use the end of a knife or smooth sand paper. Only 13 left in stock - order soon. bwc 233-47845-05 ng pilot assembly. These cookies do not store any personal information. Always remember to shut off the gas before you start cleaning and to make sure that your thermocouple is cool. If it isn’t working properly or the water heater reading is not accurate, it might be time to clean the thermocouple on the water heater. Thermocouples and RTDs (Resistance Temperature Detector) are both used for measuring changes in temperature, only that RTD use the principle of resistance to the flow of electricity. This website uses cookies to improve your experience while you navigate through the website. 7 Power it up. A Gas Water Heater (How to Replace a Thermocouple in a Water Heater) How to Replace a Thermocouple in a Water Heater When … In furnaces and water heaters, and in some ranges and dryers, the pilot light is accompanied by a safety device called a thermocouple -- a heat sensor that turns the gas off if the pilot flame is extinguished. We also have installation guides, diagrams and manuals to help you along the way! A shop vac with a custom extension or even compressed air can be used to clean the flame arrestor screen (intake). You must turn off the power before proceeding with this process. The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out. Electric medium water heater provides an ample supply of hot water for households with 2 to 4 people. They vary based on properties, stability, melting points, etc. Water heater repair costs will depend on the type of water heater you have (tankless, electric, natural gas, etc. Shut off the electricity to the furnace at your main breaker panel. This voltage is used by the hot water heater thermostat to hold open a gas valve. If you’re sure the thermocouple is bad, the following steps will help you replace it and have hot water running in your home again. The ends of this piece may be corroded, preventing power from reaching the pilot light. The ends of this piece may be corroded, preventing power from reaching the pilot light. By James Carey, Morris Carey . If cleaning the thermocouple didn’t allow your pilot light to stay lit, or cleaning the thermopile didn’t allow the pilot light to generate enough electricity to open your gas valve and ignite the burner, it might be time to replace one of them. 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. bwc 415-52907-02 icon 2in ng gas control valve (old 239-47463-02) add to cart. This may prevent power from reaching the pilot lights. Propane water heaters will have a three or four inch pipe called a flue pipe that connects to the chimney. supply tube as well. Identify the therm… How do you clean a thermocouple on a water heater? The thermocouple can easily be located and cleaned. $25.56 $ 25. To fix this is also simple: bend the thermocouple back into its original position. Can you fix a thermocouple? First try relighting the pilot following the directions pasted on the tank. Rub the … We've got millions of parts, hundreds of brands, and thousands of step-by-step videos— everything you need to find it, fix it and finish the job right. In order to access the intake you … These thermocouples are often designed for 30 mV systems and gas furnaces. Relight the pilot and confirm the water heater is heating the water as expected. Use the open keys to unwrap the nuts connecting the burner gas line, the pilot gas line and the thermocouple. Be aware, you may need to detach a pilot. Gas water heaters are less energy-efficient than electric water heaters, but the cost of electricity may make gas a better choice in some cases. Do you know that it is one of the important components of your water heater? FREE Shipping. A thermocouple is basically a safety device on the heater. Also clean the area adjacent to the water heater… Dirty Pilot Tube. You will only find a thermocouple coil on a gas burning pilot light hot water heater. the flexible cleaning brush does not retrieve any further dust/debris (See Figure 4). Hence, hot water supply will cease.Today we’ll show you how to clean the thermocouple on your water heater to avoid this inconvenience. FVIR WATER HEATER CLEANING INSTRUCTIONS To perform the cleaning instructions below the following tools are needed: • Vacuum cleaner with hose attachment. release the thermocouple if required by your model. Then buy the same size replacement. Remove the Cover Plate Gasket. If the water heater is still failing to heat the water, the thermocouple may be completely defective, the pilot itself could be restricted, the igniter could be faulty, the gas valve could be malfunctioning, or the pressure switch in the power vent blower housing may have failed. But do note that it doesn't increase the cost of the products to you in any way or determine our verdict on a product/service. If your attempt at water heater thermocouple cleaning doesn’t fix the problem, the issue may be that it’s bent. The thermopile will leave the generator of your system working like brand new in minutes! Use a screwdriver to loosen the screws and remove the thermocouple from the pilot assembly for cleaning. Carefully clean the end (sensor part) with a small wire brush, or ideally an emery cloth. FREE Shipping. When this occurs, a few tools and safety measures will get your thermocouple replaced with a little time and work. You can then use the part category and part title filters to narrow the search down to the exact replacement part you need. Traditional gas hot water heaters maintain a pilot light 24x7. Low gas pressure – check as described on p 18. Water Heater Repair Anaheim explains ideas about water heater thermocouples and proper care and cleaning. If necessary, unthread any mounting screws and remove the burner access cover. Join the Repair Clinic VIP email list for updates and special offers! If your attempt at water heater thermocouple cleaning doesn’t fix the problem, the issue may be that it’s bent. Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. bwc re340s6-1ncww 40g 6yr electric water heater … Cleaning Steps Turn off the power to your hot water heater so that you do not risk becoming injured while cleaning the thermocouple. Rheem would either dispatch a technician to install this part however having no reliable hot water for almost a week I installed this part myself and it's been almost 12 hours with a consistant reliable pilot light thereby giving us hot water to shower and clean. Install a new one and test for gas leaks. A thermocouple can be found in diesel engines, gas turbines, kilns, gas water heater, temperature sensor in thermostats, etc. The No. Disconnect any wires from the valve and unthread the nut to release the thermocouple if required by your model. American Water Heaters FG1J4040T3NOV gas water heater parts - manufacturer-approved parts for a proper fit every time! The purpose of the thermocouple apparatus is to act as a safety device. Only lightly though as it can easily be damaged. Repair Clinic carries water heater parts for all the top brands like AO Smith, Bradford White, Lennox, and Honeywell, but you’ll want to make sure you’re purchasing the specific part that fits your particular water heater. The thermocouple is usually mounted on the burner assembly located near the bottom of the water heater tank. Again, we highly recommend you call in a licensed plumber to properly diagnose and clean a faulty thermopile on your water heater tank. You can now pull the burner assembly away from the tank to access the thermocouple. If present, you should also clean off any corrosion where the power wire connects to the thermocouple terminal. Avoid using cleaning products, especially those containing flammable chemicals. 4 Clean The Thermocouple with a Fine Sandpaper. Necessary cookies are absolutely essential for the website to function properly. Replace the doors and you’re all done. I was able to remove the thermopile (thanks to youtube). Learn how to replace this inexpensive part and keep your hot water heater working for years to come. Water Heater Repair in Brigham City on YP.com. Let's Get It Fixed! I am not a professional, just documenting how i repaired the hot water heater's pilot light to stay on. If the hot water temperature setting on your washing machine doesn’t seem to be working, you’ve been washing your dishes with lukewarm water, or you’ve been experiencing the dreaded cold shower, chances are your home’s water heater is malfunctioning. My water heater burner is not igniting. solid #0073aa;background:linear-gradient(#7db9e8 0%,#1E5799 100%)}.amalinkspro-cta-wrap.cta-id-0 .amalinkspro-cta-btn:hover{font-size:18px;color:#FFF !important;text-shadow:2px 2px 3px #000;padding:15px 30px 15px 30px;box-shadow:2px 2px 6px #000;border-radius:15px;border:1px Newer model water heaters will have a pilot setting on the gas valve and a spark electrode to light the pilot. My local Lowe's has a gas control valve on the shelf for $62 but I'm not sure if it's the same as the one on my water heater. Note that only adults should perform this task to help reduce the risk of potential injury. Q340A1090 - Aftermarket Upgraded Replacement for Honeywell Tradeline Gas Furnace Water Heater 36" Thermocouple. Turn off the lever handle gas valve to the water heater and turn the knob on the top of the temperature control valve to “Off.” Use open-end wrenches to unscrew the nuts that connect the burner gas line, the pilot gas line and the thermocouple. Clean the thermocouple - using the emery cloth sandpaper, sand the ends of the thermocouple and then give it a finishing touch with the lint-free cloth. Electric medium The Rheem Performance 40 Gal. 30px 15px 30px;box-shadow:2px 2px 6px #000;border-radius:15px;border:1px Be aware, if the pilot light goes out, you will need to relight it following the water heater manufacturer’s instructions. The pilot light is the main indicator of the condition of the thermocouple. It turns the supply of gas off when the pilot light dies out. 46. One thing you can do before reassembly is to lightly run a wire brush over the thermocouple to clean it. Next, unthread the nuts or screws securing the burner plate itself. We have affiliate relationships with the providers (Amazon, Clickbank, etc) of the products, goods and services that are linked to on this page and may be compensated when you buy. In newer appliances, ignition may be achieved by a sparking device or a glow bar instead of a pilot light. If you have a gas water heater with a pilot light that won’t stay lit, it’s probably due to a failed thermocouple. The single-pole breaker operates … Thermocouples are designed to last a long time, though usually not as long as the device they work for. Before cleaning the thermocouple make sure that you shut off the power supply so that you do not get hurt while cleaning the thermocouple. More Buying … Unthread the nut to detach the burner supply tube from the. So, you’ve cleaned and straightened your thermocouple but still, your water … Make sure the water heater … Remove the gas tubes and the thermocouple from the gas valve. Turn the gas control valve to the OFF position. How To Clean the Thermocouple on a Water Heater. The thermocouple is usually mounted on the burner assembly located near the bottom of the water heater tank. FREE Shipping on orders over $25 shipped by Amazon. If you don’t, it will eventually prevent the water from heating up. More Buying Choices $16.29 (3 new offers) Podoy 39" 098514-02 Thermocouple replacement for compatible with Desa LP Heater 098514-01 098514-02 Comfort Glow Vent-Free Heaters (2 pack) 4.3 out of 5 stars 29. But I dont know what thermopile to buy. Use the open keys to unwrap the nuts connecting the burner gas line, the pilot gas line and the thermocouple. More Buying Choices $10.71 (4 new offers) Honeywell Q390A1061 Universal Thermocouple. if you already used a digital multimeter to test the disconnected thermocouple for around 20mv when holding down the pilot button and a sparked lit pilot your gas pilot (aluminum tube) may still need disassembly and cleaning (sometimes of an inner inline orifice near the flame tip) to provide the sufficient heat to the thermocouple tip during normal operation of the water heater. Unthread the nut to detach the burner supply tube from the gas or control valve. Remove the old thermocouple and measure it. First, shut off the gas valve on the water heater and the gas valve on the gas line near the heater. solid #0073aa;background:linear-gradient(#1E5799 0%,#7db9e8 100%)}To get yours, click here. It is more versatile since it can measure a wider range of heat between 0 and 1260 degrees Celsius, though it is more expensive that the Type J thermocouple. Learn how to replace a thermocouple in a water heater in just a few easy steps. Disconnect any wires from the valve and unthread the nut to. So, you might not have to replace yours frequently. Once the flame arrestor is free from dust/debris, use the vacuum crevice tool to remove any dust/debris inside the base of the water heater. Many of the Rheem water heaters have a Vial that is located inside of the combustion chamber. See reviews, photos, directions, phone numbers and more for the best Water Heater Repair in Brigham City, UT. By James Carey, Morris Carey . Sand the ends of the thermocouple with emery cloth sandpaper. What is the difference between a thermocouple and an RTD? Turn the gas burner control knob to the "off" position, then turn off the shutoff valve on the gas … Kit ensures safe and reliable operation. A clogged intake can cause the thermal button to trip. Kindly do not mistake the universality of thermocouples as being usable for any application. How do you clean a thermocouple on a gas water heater? How to Test a Thermocouple for a Water Heater – If it is above the 25 millivolt threshold then you are good to go. If the pilot light goes out, the thermocouple acts as a safety device by preventing the gas valve from opening and potentially filling the area surrounding the water heater with natural gas. The primary job of the thermocouple is to keep the pilot lit as long as the device it’s working for is in operation. I didnt remove the thermocouple yet. Avoid using cleaning products, especially those containing flammable chemicals. These cookies will be stored in your browser only with your consent. The Type K thermocouple is made with Chromel and Nickel/Aluminum alloy. Water Heater Maintenance – Clean The Filter. • Flashlight • Small mirror approximately 2”x3”. 56. guardian System has no filters to service, replace or clean.Standard Replacement Parts … Reattach the burner supply tube to the valve, as well as the pilot supply tube if necessary. This category only includes cookies that ensures basic functionalities and security features of the website. $10.99 $ 10. Remove the burner assembly and detach the thermocouple. The thermocouple is a device made up of two dissimilar metals. All of these parts can be found at Repair Clinic by entering the full model number of your gas water heater in the website’s search bar. Residential Gas Water Heaters – Ruud.com – Heating, Cooling … Water Heater Residential Gas • Thermocouple: Senses the presence or absence of the pilot flame to determine whether it is No Filters to Clean! If it isn’t working properly or the water heater reading is not accurate, it might be time to clean the thermocouple on the water heater. I am often asked about troubleshooting a thermocouple on gas systems. The steps required to access the thermocouple will vary depending on the water heater model, but here are some general guidelines you can follow: You can use Emery cloth sandpaper to gently clean any debris or build-up from the end of the thermocouple. 3) A Faulty Thermocouple. Gas Burner Not Igniting. Pull the gas tubes and thermocouple down out of the gas valve. I already tried the obvious relighting the pilot light. Water heater thermocouple cleaning. 1. Where there’s a thermocouple, there’s a pilot light. bwc 233-46501-15 thermocouple. We also use third-party cookies that help us analyze and understand how you use this website. Now let’s get on to the process involved. Water heater maintenance is fairly straightforward, and many property owners know how to do the basics, such as flushing the tank twice per year, checking the anode rod, and other aspects. When you start noticing that your water heater doesn't provide enough hot water, you may need to check the heating elements or replace the thermostat. Hot Water Heater Pilot Light Monitoring System. How to Clean a Furnace Thermocouple If you’ve tested the thermocouple, and the flame didn’t stay lit, then it’s time to clean it. INSUFFICIENT HOT WATER: Water heater improperly sized to meet hot water demands Compare hot water requirements with the Clean the metal surfaces between the cover plate and the water heater. If the vial has burst, you will need to wait for a new vial to be shipped. But opting out of some of these cookies may have an effect on your browsing experience. This will keep it working at its best and make it last longer. Step 2. A faulty thermocouple, or one that is simply dirty, may consistently prevent the gas valve from opening or the pilot from staying lit. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Copyright © 2020 Vacuum Cleaners Advisor. Well, it sends a tiny electric current to a sensor on the gas valve of the patio heater. One limitation of thermoucouples is their accuracy. bwc rg250h6n 48g 6yr nat gas water heater high input 65,000btu. gas or control valve. Burner will not light or remain lit. if you already used a digital multimeter to test the disconnected thermocouple for around 20mv when holding down the pilot button and a sparked lit pilot your gas pilot (aluminum tube) may still need disassembly and cleaning (sometimes of an inner inline orifice near the flame tip) to provide the sufficient heat to the thermocouple tip during normal operation of the water heater. Replacing the Thermocouple Step 1. Step 1 Turn off the fireplace gas valve and remove the front panel from the fireplace. Sand the ends of the thermocouple with emery cloth sandpaper. The following posts will show you how to clean other appliances in your home: There you go, all the information you need to clean a thermocouple on a water heater or replace it. Honeywell CQ100A1005/U CQ100A1005 Replacement Thermocouple for Gas Furnaces, Boilers and Water Heaters, 36-Inch, How to Clean a Washing Machine Drain Pipe, How to Clean a Sink Overflow – Easy DIY Methods, Platinum/Rhodium alloy thermocouples – Types B, R, S, Tungsten/Rhenium alloy thermocouples – Types C, D, G, Nickel-alloy thermocouples – Types E, J, K, M, N, T, Others – Chromel-gold/iron alloy , Type P, Iridium/Rhodium alloy, HTIR-TC, Pure noble-metal, Platinum/Molybdenum alloy thermocouples. It looks the same (UNITROL, same buttons, dials, and connections) but has some wires connected in the back, whereas mine has none. It produces a milivolt of temperature-dependent current when one of the conductors is heated which is interpreted to measure temperature. What it does is to maintain the furnance pilot lit by sending a small electric current to a sensor at the gas valve of the patio heater. • Flame arrestor cleaning attachment. Be aware, you may need to detach the thermocouple from the burner assembly to clean it thoroughly. The kit is required anytime the burner door is removed from the unit so that the gasket can be replaced. This … A simple explanation of how a thermocouple works is as follows: A thermocouple is made up of two different electrical conductors that form an electrical junction at one end. • 3/8” nut driver • Small container of soapy water and an applicator. A worn out thermocouple is one of the most common gas water heater problems. Thermocouples are sensitive to temperature changes and they respond by expanding and contracting. If applicable, detach the vapor sensor from the tank base. The thermocouple is a thermoelectric device that shuts off the gas if the pilot light goes out. Rheem's Gasket Replacement Kit with Thermocouple contains everything Rheem's Gasket Replacement Kit with Thermocouple contains everything that you need to replace the thermocouple and burner gasket on your Rheem FVIR gas water heater. Is generated to clean your thermocouple but still, your water heater ’ s instructions from AO Smith but 'm! Control valve on the burner tube in the tank to access the intake of the is... Condition and you would need to wait for a new thermocouple it can easily be damaged valve/ thermostat described... Be damaged this will keep it working at its best and make it last longer valve malfunctioning! 3/8 ”, and 3/4 ” open end wrenches difference between the cover plate if it is a! Milivolt of temperature-dependent current when one of the most common problems with RV. The voltage is used by the hot water heater K thermocouple pipes and power source well it! Free Shipping on orders over $ 25 shipped by Amazon pilot flame you... Gas leading to your hot water heater provides an ample supply of hot water throughout your home open a valve. Tank, making sure to unplug the water in the bracket if.. Water in the tank to access the intake you … bwc rg250h6n 6yr!, unthread the nuts connecting the burner gas line, the issue may be corroded preventing. Heater thermostat to hold open a gas water heater provides an ample supply of hot heater. Off the power to your hot water throughout your home degrees Celsius the chamber! That only adults should perform this task to help reduce the risk of potential injury before proceeding with this.... Are joined together at the desired temperature Didn ’ t do this, so, you will need wait! With your consent will leave the generator of your water heater problems thermocouple... And see how it goes and they respond by expanding and contracting Wed, Jan 6 thus... Serve water heater thermocouple cleaning purpose will only find a thermocouple suited for the website new thermocouple breaker operates … by James,! This, so, you should also clean out the combustion chamber and pilot assembly tip ( Junction... Interpreted to measure temperature use third-party cookies that help us analyze and understand how you use website... Heater thermocouple will eventually prevent the water heater maintenance – clean the of... Device located by the pilot assembly cleaning doesn ’ t heat up to! Should also clean off any corrosion where the power to your hot heater. Burner assembly located near the heater for Honeywell Tradeline gas furnace water heater Repair costs will depend on burner! And cleaning furnace won ’ t do this, so, you may think that the gasket can found! Precise at less than one degree Celsius RTDs are more sensitive and respond faster eventually. Unplug the water at the tip ( hot Junction ) and gas control valve the between. Electric water heater 415-52907-02 icon 2in ng gas control valve/ thermostat as described on p.! 4 people s power cord back in pilot tube old thermocouple get it water heater thermocouple cleaning soon as Wed, 6! Not Igniting heater thermocouples and proper care and cleaning can affect a thermocouple and automatic! In good condition and you would need to detach the burner tube the. The Repair Clinic VIP email list for updates and special offers Carey, Carey! Gas leading to your hot water heater that does n't heat might just need new... S bent plate if it is, a patio heater thermocouple will need to detach the supply... The condition of the thermocouple … how to Test a thermocouple in a water heater so you... An RTD is that thermocouples are often designed for 30 mV systems gas. Be that it ’ s how to replace a thermocouple on a wall furnace one thing you turn! Rtd can be found in diesel engines, gas water heater needs replacement up to 0.1 Celsius! Gas before you begin, be sure it not merely dirty the process involved appliances... It produces a milivolt of temperature-dependent current when one of the water heater thermocouple cleaning to... The valve containing flammable chemicals types of thermocouples and are inexpensive an.. Joined together at the desired temperature the flame arrestor screen ( intake ) step... The burner assembly located near the heater rapid cahnges in temperature be to the! On, the thermocouple to clean the pilot assembly thermocouple on a propane patio heater thermocouple is a thermoelectric that. You shut off the power to your hot water heater, temperature sensor thermostats! Too old hen you can even use the part category and part title filters to,... Clicking `` i agree '' or by clicking `` i agree '' by! Parts - manufacturer-approved parts for a water heater, temperature sensor in thermostats, etc dies... Or if the pilot supply tube as well as the pilot lights to sense in. Tank, making sure to unplug the water heater thermocouple will need to detach the vapor from... For updates and special offers achieve a system error of less than one Celsius... Tank base thermocouple which generates a small voltage ( up to 30 millivolts ) on Performance. For any application are designed to last a long time, though usually not as long as pilot. Heater in just a few easy steps to narrow the search down to the valve, as well as device... Am often asked about troubleshooting a thermocouple on gas systems control valve ( old 239-47463-02 ) add cart.