Thermopile Voltage Low Water Heater1443 Proper Position for the Pilot Assembly for the ULN Residential Gas Atmospheric. With the leads apart, you will read infinity. 553K views 4 years ago How to replace a thermopile on a water heater. A healthy thermopile will show 650 to 850 millivolts or somewhere in between. Pilot light in a water heater is a small flame that continually operates. It combines different thermocouples, and the main task of the thermocouple is to keep the water heater temperatureperfectly fine. If you happen to see the thermopile voltage low error often, it means there is some problem with the primary thermopile system. This fractional voltage energizes a small solenoid designed for millivolts. The thermopile generates electricity in the Honeywell water heater that is needed to power the gas control valve. Place the New Thermopile Wire. 2022-02-24 What is the voltage output of a thermopile?. On a water heater, the thermopile voltage is used to measure the temperature of the water in the tank. The machine may flash a specific light multiple times to help you identify the problem. I have an LP water heater by AO Smith (GCV 40 301). Install the Manifold Component Block. Reconnect the Thermal Switch Wiring. Google "replacing the thermopile on a State gas water heater". Three hundred millivolts or higher voltage is a sign of a good thermopile. I'll show you how to replace a thermopile on a water heater with a Honeywell gas valve. Thermopiles are used for contactless temperature sensing. What should - Answered by a verified Plumber. Voltage: 380 V. The temperature differential between the two conductors produces the voltage in a thermopile. A reading below 300 millivolts would require you to replace the thermopile. If the open-circuit test reads below 400 millivolts, then the thermopile likely requires service or replacement. If the thermocouple has low voltage, then your heater won't be able to deliver warm water. If you happen to see the thermopile voltage low error often, it means there is some problem with the primary thermopile system. Unfortunately, this error isn’t exclusive to Honeywell water heaters. Pilot light keeps going out? A faulty thermocouple may be at fault. As it is the cheapest way to go, I'd suggest a new thermopile, it could be the thermoseat (tiny electromagnet) in the valve is faulty and not sticking. Firstly, the thermopile is at fault. However, every once in a while, you may come across some issues, and thermopile voltage low can frustrate the hell out of you. Honeywell Water Heater Parts at Low Costs! Honeywell Water Heater Pilot Light Won’t Light. Pilot light keeps going out? A faulty thermopile may be at fault. Base ring filter looks clean to me. If the thermopile voltage is low, the pilot light will go out. You can try the following steps to fix a low Thermopile voltage: #1 Check the thermopile connection Ensure the Thermopile has securely connected to the system and that the connection is not loose or. The thermopile of your water heater can’t produce the required voltage output for two reasons. The machine may flash a specific light multiple times to help you identify the problem. A couple times it has given the double blinking light "Thermopile voltage low". com: Water Heater Thermopile 1-48 of 197 results for "water heater thermopile" Results Price and other details may vary based on product size and color. Thermopile Voltage Low Rheem Your water heater may not work, and the gas control valve blinked with the two lights – which means that you have voltage thermopile. Product information Technical Details. This could be due to a number of factors, such as: -The thermostat is set too low. Before moving towards the thermopile, you have first to set the multimeter. Secondly, turn on the meter and set it to Ohms. How to test a thermocouple's voltage using a multimeter. If your pilot light won’t stay lit, the thermocouple probably needs to be replaced. l 7 flashes - Gas control valve failure. I installed a brand new Rheem 40 gallon 32000 BTU gas water heater last week and everything was going fine. Reliance Water Heater CO 100112328 21" Thermopile Assembly $2380 + Resideo WT8840B1000 Water Heater Gas Control Valve, NAT 160 Degree F 1" Cavity $15249 Total price: Add all three to Cart These items are shipped from and sold by different sellers. Most water heaters would show you a list of status light codes. I have a rheem performance water heater and I was getting the thermopile voltage low indicator. Heater went cold, and controller indicated the two flashes for Thermopile Low Voltage. It means the voltage dropped too low. The function of a thermopile is to transfer the heat radiation emitted from the object to a voltage output. What do I do now to fix problem … read more. Heater Material: MS, SS. Almost all heaters come with good indicators and documentation to help you in the setup process. The right professional can fix the igniter without causing further damage to the unit. The error thermopile voltage low means the voltage of the thermopile dropped well below that number. 553K views 4 years ago How to replace a thermopile on a water heater. It will also tell you the range of millivolts your water heater thermopile has. Low thermopile voltage issues are due to cold junction errors, loose wires, faulty internal units. How to test a thermopile's voltage using a multimeter. Three hundred millivolts or higher voltage is a sign of a good thermopile. It will also tell you the range of millivolts your water heater thermopile has. After replacing thermopile which included the igniter and gas supply pipe, the pilot goes out immediately after releasing control knob. A thermopile is just a high voltage thermocouple. Inspect thermocouple to ensure that it is fully engaged into pilot bracket. Detector, Thermopile, TO-5, 0. Thermopile low voltage means that the thermopile fails to deliver the correct voltage, and the water heater blinks a red light at you. Now all of the sudden it flashes a red light twice which the manual says is "thermopile voltage low". When the thermopile voltage is low, and the pilot light is out, you will not be able to enjoy that steamy shower that you are accustomed to. The pilot is still on, so it can be completely faulty, right?. If the thermopile voltage is low, it will affect the operation of the gas valve and may prevent the appliance from igniting altogether. water heater with Honeywell control has 2 flashing red lights low voltage … read more Rick HVAC Supervisor 39,181 satisfied customers Just replaced the thermopile on the water heater but it's Just replaced the thermopile on the water heater but it's still giving the low voltage code. Final Thoughts Indeed, dealing with a thermopile problem in your water heater could be a huge pain. I installed a brand new Rheem 40 gallon 32000 BTU gas water heater last week and everything was going fine. 1442 Thermopile Gas Control (Vesta) Valve 1442 Technical Bulletin. The error thermopile voltage low means the. Heater Material: SS: Brand: GHI: Color: Metalic: Dimensions (millimetre) As Per Need: Voltage Range (volt) As Per Need: Weight (kilogram) As Per Need: Power(Watts) 230:. Pilot light keeps going out? A faulty thermopile may be at fault. Before fixing the Thermopile, you must know meaning and working process of the thermopile. There's a roughly 12"x6" grate for return air on the door into the closet. If the thermopile voltage is low, it will affect the operation of the gas valve and may prevent the appliance from igniting altogether. If the voltage is low, it means that the water. If the thermopile does not generate the correct voltage, the heater may fail to provide you hot water. Hello, our water heater pilot light goes out once releasing the pilot button to set the heat. #1 Honeywell WV8840B1042 gas valve; Whirlpool N40T61-343 water heater Heater went cold, and controller indicated the two flashes for Thermopile Low Voltage. How do you replace a thermopile on a water heater? Replacing a Thermopile. Remember that a healthy thermopile in an open circuit test will often read between 650 to 850 millivolts. As it is the cheapest way to go, I'd suggest a new thermopile, it could be the thermoseat (tiny electromagnet) in the valve is faulty and not sticking. Proper tightness should be finger tight plus ¼ turn. A thermopile is used for a standing pilot system and generally produces around 600-750 millivolts. , Plumber 17,634 Satisfied Customers 20 years of plumbing experience, including high end homes and service Mike R. Our water heater has been working great the past few months, but then this week the we noticed the water doesn't get as hot. It is a tool that records the electrical values of your water heater. How do you replace a thermopile on a water heater? Replacing a Thermopile. Many other types of water heaters use. If so, it needs to be replaced by a skilled technician. Business listings of Heater Parts, Electric Heater Part manufacturers, suppliers and exporters in Ahmedabad, हीटर पार्ट्स विक्रेता, अहमदाबाद, Gujarat along with their. I am getting no warm water at all. If the voltage is low, it means that the water temperature is lower than it should be. Carbon monoxide detector is working and reading zero. You can try the following steps to fix a low Thermopile voltage: #1 Check the thermopile connection Ensure the Thermopile has securely connected to the system and that the connection is not loose or broken. All Explained on this 750 Millivolt Thermopile powered Honeywell Gas Valve Control. The Ask an Expert Home Improvement Questions HVAC Questions HVAC Guru, HVAC TECH 24,459 Satisfied Customers 20yrs in the HVAC industry with certificates and degrees. If the voltage is low, the thermo-pile won't be able to operate correctly. NEW FCG-75-400 water heater pilot goes out and thermopile voltage on 5 attempts has steady state readings of 646, 641, 636, 632 and 636 mV. The output is in the range of tens or hundreds of millivolts. Not all systems alert you in the same way. HVAC Guru is online now Related HVAC Questions. This could be due to a number of factors, such as: -The thermostat is set too low. The Honeywell controller blinks red twice coding to thermopile low voltage, but when I disconnect the two wire connector from the Honeywell controller and measure the voltage when pressing the spark burner get a reading of +700 millivolts which indicates the thermopile should be fine. Before moving towards the thermopile, you have first to set the multimeter. Remove the Pilot Assembly and Thermopile Wire. Thermopile Voltage Low Rheem Your water heater may not work, and the gas control valve blinked with the two lights – which means that you have voltage thermopile. The top element is receiving 240V however the bottom unit is only receiving 120V. I installed a brand new Rheem 40 gallon 32000 BTU gas water heater last week and everything was going fine. My experience with thermopiles often yield up to 750mV after a couple minutes of heating. On older 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. It will also tell you the range of millivolts your water heater thermopile has. For a quick test you could get a AA battery and wire that on to the valve to see if it holds then. Acceptable range for most water heaters is around 400 mV. Thermopile Voltage Low Rheem The water heater might not be working as expected, and your gas valve blinks with two lights, meaning you have a the voltage. The machine may flash a specific light. First, remove the thermocouple. 24 after $25 OFF your total qualifying purchase upon opening a new card. Most water heaters would show you a list of status light codes. My experience with thermopiles often yield up to 750mV after a couple minutes of heating. If the thermopile voltage is low, it will affect the operation of the gas valve and may prevent the appliance from igniting altogether. As an example like the video below about Water Heater Pilot Light & Thermopile Troubleshooting :. Smith, Kenmore, State, American Water Heater 4. Before fixing the Thermopile, you must know meaning and working process of the thermopile. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters. On older heaters with standing pilot lights, the device is typically called a thermocouple, while on newer units. The error thermopile voltage low means the voltage of the thermopile dropped well below that number. So, what do you do when your water heater thermopile voltage is low? High winds can cause the pilot to be extinguished, which stops thermopile voltage. I checked the water heater and am getting a flashing red lights that signals that the "thermopile voltage low". Numerous sources inform you of the thermopile voltage being low on your water heater. Pilot is lit on my Rheem gas water heater and 2 red lights flashing on Honeywell gas control valve indicating low Ask an Expert Home Improvement Questions HVAC Questions Pilot is lit on my Rheem gas water heater and 2 red lights Kenton Guidry, HVAC Technician 1,031 Satisfied Customers 12 years install/service experience. The thermopile generates electricity in the Honeywell water heater that is needed to power the gas control valve. Low Thermopile Voltage Your Rheem water heater will blink red light two times every three seconds if the thermopile voltage is low. Low thermopile voltage issues are due to cold junction errors, loose wires, faulty internal units. Now take a multimeter and set it to DC volt. I get the same code two-flash code as before, Thermopile Low Voltage. Just replaced the thermopile on the water heater but it’s still giving the low voltage code. What causes low thermopile voltage? So, this is what the thermopile voltage low error means. If you happen to see the thermopile voltage low error often, it means there is some problem with the primary thermopile system. Thermopile Voltage Low Rheem The water heater might not be working as expected, and your gas valve blinks with two lights, meaning you have a the voltage thermopile. Our water heater has been working great the past few months, but then this week the we noticed the water doesn't get as hot. Compatible with Rheem Performance Series Gas. The error means the thermocouples in the collection cannot generate enough current to power the control panel that we mentioned. Might have to remove some front metal. Check connection at combination thermostat/gas valve. However, every once in a while, you may come across some issues, and thermopile voltage low can frustrate the hell out of you. It might not make enough voltage if it is not in the right place. If the voltage is low, the thermo-pile won’t be able to operate correctly. A healthy thermopile will show 650 to 850 millivolts or somewhere in between. Clearance around the water heater is probably just a few inches on the sides, maybe more like five in the front and back. If it is below 450 millivolts, be sure the thermopile is defective, and you need to change it. Reliance Water Heater CO 100112328 21" Thermopile Assembly $2380 + Resideo WT8840B1000 Water Heater Gas Control Valve, NAT 160 Degree F 1" Cavity $15249 Total price: Add all three to Cart These items are. MultiMeter Thermocouple Test Procedure. Smith, Kenmore, State, American Water Heater. What is the ideal output voltage of a thermopile? A healthy thermopile in an open circuit test will read between 650 to 850 millivolts or somewhere in between. Step 2: Now, it’s time to relight the pilot. When the thermopile voltage is low, and the pilot light is out, you will not be able to enjoy that steamy shower that you are accustomed to. Upgrade 100112328 21" Thermopile Assembly for Gas Water Heater, 750 Millivolt Thermopile Replacement Kit Compatible with Reliance, Whirlpool, A. ₹ 5,000/ Piece Get Latest Price. Unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. Since almost all major brands of atmospherically vented water heaters have switched from a thermocouple to a. Just replaced the thermopile on the water heater but it’s still giving the low voltage code. Having a Defective Spark Electrode. Most water heaters would show you a list of status light codes. Detector, Thermopile, TO-5, 0. Honeywell WV8840B1042 gas valve; Whirlpool N40T61-343 water heater Heater went cold, and controller indicated the two flashes for Thermopile Low Voltage. Acceptable range for most water. Looking for specific info? See questions and answers Customer reviews. Low thermopile voltage issues are due to cold junction errors, loose wires, faulty internal units. Unfortunately, this error isn't exclusive to Honeywell water heaters. Now all of the sudden it flashes a red light twice which the manual says is "thermopile voltage low". The thermopile must be at the correct. If you happen to see the thermopile voltage low error often, it means there is some problem with the primary thermopile system. Thermopiles work as sensors or generators. When the thermopile voltage is low, and the pilot light is out, you will not be able to enjoy that steamy shower that you are. Check out some similar questions!. Detector, Thermopile, TO-5, 1. Honeywell WV8840B1042 gas valve; Whirlpool N40T61-343 water heater Heater went cold, and controller indicated the two flashes for Thermopile Low Voltage. Country of Origin: Made in India. Top 10 Gas Water Heater Pilot Light Problems! Won't Light, Won't Stay Lit! AC Service Tech LLC 480K views 2. Tried Ask an Expert Home Improvement Questions Plumbing Questions Mike R. AO Smith Gas Water Heater 24" Thermocouple Replacement 9000056045 - YouTube 0:00 / 7:13 AO Smith Gas Water Heater 24" Thermocouple Replacement 9000056045 RepairClinic. If the igniter is getting the voltage but the heater is not lighting, this is a sign that the igniter is defective. l 8 flashes - Power off failure. Any other ideas I should try before calling for service?. Usually, that number falls in the 650 range to 850 range. I understand that the top element feeds the bottom element. Excelitas Technologies Sensors. Many other types of water heaters use the same Honeywell thermo-pile controller. After replacing thermopile which included the igniter and gas supply pipe, the pilot goes out immediately after releasing control knob. NEW FCG-75-400 water heater pilot goes out and thermopile voltage on 5 attempts has steady state readings of 646, 641, 636, 632 and 636 mV. If the thermopile needs replacing, is it possible to replace it without buying a complete burner assembly on this AO Smith GCV 40 301 unit? should be a easy part to find breplum Professional Professional Joined Nov 14, 2017 Messages 1,876 Reaction score 947 Location Lafayette, CA Jun 7, 2019 #9. l 4 flashes - Temperature exceeded. Thermopile low voltage means that the thermopile fails to deliver the correct voltage, and the water heater blinks a red light at. On a water heater, the thermopile voltage is used to measure the temperature of the water in the tank. Not your question? Ask your question View similar questions Add your answer here. I have a Rheem hot water heater that. 553K views 4 years ago How to replace a thermopile on a water heater. On a water heater, the thermopile voltage is used to measure the temperature of the water in the tank. Additionally, the location of your device such as windy area can also develop such voltage issues. is online now Related Plumbing Questions. Most water heaters would show you a list of status light codes. The Honeywell CQ200A has been proven in millions of appliances as the contractor's preferred thermopile and are found in many of today's self powered gas fireplaces. Usually, that number falls in the 650 range to 850 range. And secondly, loose wiring connections can also cause this symptom. Afterward, to each connector, connect the probes. Additionally, the location of your device such as windy area can also develop such voltage issues. Some show a continuous blinking red light, while others work in light sequences of three or four. Our water heater has been working great the past few months, but then this week the we noticed the water doesn't get as hot. Now all of the sudden it flashes a red light twice which the. The thermopile generates electricity in the Honeywell water heater that is needed to power the gas control valve. Usually, that number falls in the 650 range to 850 range. Feed the Wires Through the Manifold Door. Make sure that the gas controller is in the off position before attempting this repair. Thermopile Voltage Low Rheem The water heater might not be working as expected, and your gas valve blinks with two lights, meaning you have a the voltage thermopile. Place the New Thermopile Wire. The Honeywell controller blinks red twice coding to thermopile low voltage, but when I disconnect the two wire connector from the Honeywell controller and measure the voltage when pressing the spark burner get a reading of +700 millivolts which indicates the thermopile should be fine. water heater with Honeywell control has 2 flashing red lights low voltage … read more Rick HVAC Supervisor 39,181 satisfied customers Just replaced the thermopile on the water heater but it's Just replaced the thermopile on the water heater but it's still giving the low voltage code. When the heat hits the hot junction or tip of the thermocouple, it produces millivolts. As long as the solenoid is energized, the pilot valve inside the. So, the corrective action you need to take is- check the thermopile and replace it if it gets defective. Check thermocouple and replace if necessary. 1317 – Dual Voltage Rating on Residential Electric Water Heaters 1317 Technical Bulletin 2013 there is a new pilot assembly kit for the California Ultra Low NOx gas water heaters. Honeywell WV8840B1042 gas valve; Whirlpool N40T61-343 water heater Heater went cold, and controller indicated the two flashes for Thermopile Low Voltage. On a water heater, the thermopile voltage is used to measure the temperature of the water in the tank. ABSTRACT: The Vesta Water Heater Control System is a low-power device designed to operate using the millivolt output of a thermopile placed in the pilot flame of the water heater. Now test the voltage on the thermopile following the steps below: Step 1: Pull out your heater’s bottom access cover. Reliance Water Heater CO 100112328 21" Thermopile Assembly $2380 + Resideo WT8840B1000 Water Heater Gas Control Valve, NAT 160 Degree F 1" Cavity $15249 Total price: Add all three to Cart These items are shipped from and sold by different sellers. Smith, Kenmore, State, American Water Heater 4. Acceptable range for most water heaters is around 400 mV for an. l 2 flashes - Thermopile voltage is low. 19 FREE delivery Thu, May 4 on $25 of items shipped by Amazon Or fastest delivery Tue, May 2. The pilot is lit and I hear the burner kick on sometimes. How to test a thermopile's voltage using a multimeter. The voltage will also be low if the temperature difference is too low. Apply for a Home Depot Consumer Card. What do customers buy after viewing this item? Page 1 of 1 Start over. Hello, our water heater pilot light goes out once releasing the pilot button to set the heat. Since almost all major brands of atmospherically vented water heaters have switched from a thermocouple to a. Many sources tell you about thermopile voltage low on the water heater. It means the voltage dropped too low. Thanks to modern technologies and simplified systems, it has become relatively easy to install and maintain a water heater. Status Light Blinking 3 Times Flickering the light 3 times on the status light is the error indication of the stuck open draft pressure switch in the heater. If the thermopile needs replacing, is it possible to replace it without buying a complete burner assembly on this AO Smith GCV 40 301 unit? should be a easy part to find breplum Professional Professional Joined Nov 14, 2017 Messages 1,876 Reaction score 947 Location Lafayette, CA Jun 7, 2019 #9. The temperature differential between the two conductors produces the voltage in a. Water heater voltage [ 1 Answers ] My water heater quite woking. Adjust tip of thermocouple to be fully engulfed by pilot flame. This "Reliance Water Heater 9007876 Gas Thermopile Assembly" was used to replace a Kenmore water heater Model #153331651 "9007876 Pilot Assembly w/Tubing and Fittings". When it happens, the status light will blink once every 3 seconds which indicates normal operation. Amazon's Choice Reliance Water Heater CO 100112328 21" Thermopile Assembly 398 $2380 $43. How To Reset Your Honeywell Water Heater How Do You Light A Pilot Light?. The thermopile should test out between 650 to 850 millivolts if it'. After replacing thermopile which included the igniter and gas supply pipe, the pilot goes out immediately after releasing control knob. If the voltage is low, it means that the water temperature is lower than it should be. My 50 gallon AO LP gas water heater is flashing twice, which indicates that the thermopile voltage is low. If it is below 450 millivolts, be sure the thermopile is defective, and you need to change it. Replacing a Thermopile. NEW FCG-75-400 water heater pilot goes out and thermopile voltage on 5 attempts has steady state readings of 646, 641, 636, 632 and 636 mV. Remove the Pilot Assembly and Thermopile Wire. Thanks to modern technologies and simplified systems, it has become relatively easy to install and maintain a water heater. If your water heater isn't working or the pilot light is out, the thermopile may be faulty or have low voltage. If you happen to see the thermopile voltage low error often, it means there is some problem with the primary thermopile system. Honeywell 750 Millivolt Replacement Thermopile Generators have long been used in self-powered heaters and hot water equipment. The Honeywell controller blinks red twice coding to thermopile low voltage, but when I disconnect the two wire connector from the Honeywell controller and measure the voltage when pressing the spark burner get a reading of +700 millivolts which indicates the thermopile should be fine. A healthy thermopile will show 650 to 850 millivolts or somewhere in between. Ensure the Thermopile is in the right place and facing the heat source. FREE delivery Wed, May 10 on $25 of items shipped by Amazon. Upgrade 100112328 21" Thermopile Assembly for Gas Water Heater, 750 Millivolt Thermopile Replacement Kit Compatible with Reliance, Whirlpool, A. The thermopile of your water heater can’t produce the required voltage output for two reasons. Water heater voltage [ 1 Answers ] My water heater quite woking. It will take up to 90 seconds to get hot enough to power the gas control valve once the pilot is lit. ABSTRACT: The Vesta Water Heater Control System is a low-power device designed to operate using the millivolt output of a thermopile placed in the pilot flame of the water heater. HEAT-MAX ENGINEERING offer ESP Electrostatic. Thanks to modern technologies and simplified systems, it has become relatively easy to install and maintain a water heater. How does it Work? How Many Milli-Volts Should the Thermopile Generate? What Problems Can Occur? How Should The Pilot Operate? How do You Fix it? All Explaine. The voltage will also be low if the temperature difference is too low. A reading below 300 millivolts would require you to replace the thermopile. It is a must to have proper voltage on the thermopiles to get hot water from your water heater. Just replaced the thermopile on the water heater but it’s still giving the low voltage code. I'll show you how to test a thermopile on a water heater that has a Honeywell gas valve. -The burner is not working properly. I replaced the pilot Ask an Expert Home Improvement Questions HVAC Questions Gaztech1, HVAC Technician Satisfied Customers HVAC technician Gaztech1 is online now Related HVAC Questions Rheem customer service. If the thermopile does not generate the correct voltage, the heater may fail to provide you hot water. The temperature differential between the two conductors produces the voltage in a thermopile. Your thermopile needs a replacement or service if the read is below 400 millivolts. Gas Rheem Hot water heater indicates low thermopile ( 2 Flashing red lights) -- turned off for a while ( 10 mins). You can try the following steps to fix a low Thermopile voltage: #1 Check the thermopile connection Ensure the Thermopile has securely connected to the. I checked the water heater and am getting a flashing red lights that signals that the "thermopile voltage low". I have a rheem performance water heater and I was getting the thermopile voltage low indicator. Then go forward and disconnect the control valve’s two wire connectors. So, this is what the thermopile voltage low error means. Status Light Blinking 3 Times Flickering the light 3 times on the status light is the error indication of the stuck open draft pressure switch in the heater. Once done, reach the gas control, from where you have to disconnect the wiring of the thermopile. If the thermopile voltage is low, it will affect the operation of the gas valve and may prevent the appliance from igniting altogether. Thermopile Voltage Low Rheem Your water heater may not work, and the gas control valve blinked with the two lights - which means that you have voltage thermopile. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters. #1 Honeywell WV8840B1042 gas valve; Whirlpool N40T61-343 water heater Heater went cold, and controller indicated the two flashes for Thermopile Low Voltage. Finally, NOW TURN THE METER TO VOLTS. Thermopile low voltage means that the thermopile fails to deliver the correct voltage, and the water heater blinks a red light at you. That is simply a test to check the meter for continuity. The thermopile must be at the correct. A thermopile is just a high voltage thermocouple. A thermocouple or flame sensor is a device used to control gas flow in gas water heaters. If you happen to see the thermopile voltage low error often, it means there is some problem with the primary thermopile system. Touch the two leads together from the meter, and you should get a reading close to zero. What do I check next … read more Appliance Guru. Almost all heaters come with good indicators and documentation to help you in the setup process. If the top element is bad would that cause the problem. Thermopile is the important part of a water heater that senses the heater's temperature. Ensure you have set the voltage to 1 or millivolts.