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water heater gas control valve troubleshooting

Im not sure where to even begin. After setting, it's locked in place to avoid accidental changes, which could cause scalding. Thanks for the help. Air in the gas line. Hello. If the sensor doesnt detect the flame, the control board will signal the gas valve to shut down. Ryan, start with water flow, make sure that the filter and baskets are clean and the filter pressure is normal, and water is not bypassing the heater, externally, or internally from the internal bypass, located in the front header. This helps in avoiding accidents. WebLow gas pressure or a defective gas control valve may result in the pilot light going out frequently. Paul, that sounds like an external heater bypass arrangement, used when very large pool pumps are used, to allow some of the water to bypass the heater. Now, thats a tiny spider, I know, but I promise, it happens! Its around 7-10 wc for natural gas in my neck of the world. I connected my old termistor and got a reading of 85 degrees. WebNavien tankless water heater not circulating. This is used when the hot water can reach a boiling point. Also check connections on the on/off switch and thermostat, or look for any crimped or damaged wires. However, if your gas system is new, then it may already have a pre-set 50-degree as adjusted in the factory during manufacturing. Reduce strength of exhaust vent and/or number of elbows. We have a Pentair pool heater that all the sudden kicked off Saturday. Start by verifying the problem is not an issue with supply. Also, check the filters to see if they are clean. Pressurized freshwater is reaching the inlet of the water heater. Close the hot and cold valves and run off some cold and hot water from nearby taps to drain the pipes while you work. Cut the copper pipe to length with a pipe cutter tool and ensure the ends of each tube are smooth and burr-free. $59.98. Note: Only clean an orifice with compressed air as drill bits and other abrasive items can enlarge the opening. As of now, Im at the mercy of my pool company? And another convenience for homeowners who want easier ways to control their water heater. Check the manifold orifices to ensure they are the right ones for LP too. Even the new MasterTemp above ground pool heater has the same design, and the same troubleshooting procedure. Carlos, those symptoms are HLS when it cools down, it turns back on. It means you need to fix the problem. It is pretty standard, thoughabout 3.5 water columns (wc). Will an HVAC upgrade add value to your home? These guys were fabulous. Follow these steps to troubleshoot the issue: 1. Hydrojet is unequaled in its effectiveness. 363. Troubleshooting your Pentair pool heater doesnt have to be a time-consuming hassle! Here are ten things we can check when we think we have a bad gas valve before condemning it: What else should folks check when troubleshooting a furnace gas valve? Next, a safety device called a pressure switch activates when the diaphragm inside it recognizes the inducer motors suction or purging action. Some guys get a little over the top and really crank down on it. If flammable vapors enter this uniquely designed system and are ignited, any flames present in the chamber will be prevented from traveling backwards through the flame arrestor plate and outside of the water heater, providing added protection for you and your home. A hot water tempering valve is engineered in a manner to maintain a temperature which is suitable for the tank as well as for dispensing. What else can impact the temp reading? But if you are unsure, ask your local professional plumber to fit it for you; it should only take a few minutes to do. ******************************************************** A) Make sure the valve is turned to the On position. Its straightforward, and you should have this memorized before you can even consider being qualified for troubleshooting a furnace gas valve. Thats why you can have issues with your furnace related to your gas valve because it wasnt set up right by the installer during its first use. If not, Ill attach it below so you can brush up on what they are and the things that can go wrong with them. If youre using LP gas, youll need to make sure you put the right spring in it. Since then, weve added key features like Microban antimicrobial technology and improved the application of this exclusive formula to create the perfect tank lining. Heater Has No Gas. Check the wires to the gas valve. This kills harmful bacteria and germs present inside the tank. Vitraglas tank lining with Microban is uniquely formulated and applied to the water heater tank, head, base, and flue tube, and is then bonded to the steel surface by firing at a temperature of over 1600F. Leave me a comment down below to share your expertise. There will be air in the system, which will clear once the tank is full again. It can also crack your heat exchanger since its only rated to handle a certain amount of heat. 118,200. See page 16 and verify the gas regulator is -0.2 wc. WebHeating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space.Its goal is to provide thermal comfort and acceptable indoor air quality.HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid Be sure the heater is turned off at the breaker, and youre wearing proper protective gear. The printed circuit board or electric solenoid attached to the gas valve isnt telling the valve to open, OR that gas valve board IS telling it to open, but the valve is stuck somehow. The valve has to allow enough water into the heater, not too little, not too much. C) Pilot is on, but no gas flows from the valve when turned to the On position. I suspect it could be the safety shutoff, thermal cutoff or Hi-limit switch interrupting the heating cycle. Here are the video links. Keep in mind that both natural and propane gas units are more complex devices than electrical so troubleshooting is more complicated, time-consuming and costs more.. Common Bradford White is American Strong. Propane: Make sure your propane cylinders are turned on and other appliances are operating correctly. So I thought that was causing the problem. Safeguarding your family is your primary concern. Available in electric models as well as natural gas and liquid propane models, these units have an insulated tank that heats and stores water until you need it.Natural gas and propane water heaters normally use less energy and are less expensive to operate than electric models of the same size. The correct resistance can be found in the owners manual. Maybe that is it? This is why you can benefit a lot with a hot water tempering valve that can control the temperature of dispensed water. Check for wet or damaged igniter with low resistance to ground. "address": "",
Instead of adding water volume, the Infiniti K uses the mass of the existing water already contained within the heat exchanger to create a surplus of water thats 10 to 20 degrees hotter than the desired set point. My Pentair 250 heater will not stay on the pool setting. Allow the water heater to cool for a couple of hours before you start working on the job to avoid scalding risks. Thats coming up here on Fox Family Heating & Air. If the furnace runs for a few minutes, then shuts off, something could be causing the inside of the furnace to get too hot. Make sure you identify the pipe first, then tackle the job carefully and methodically; you will do it! All rights Sounds like the pool thermostat is not responding, either from a loose connection, or crimped wire or bad thermostat / potentiometer. Rinnai V65eN Non-Condensing Natural Gas Tankless Water Heater, Outdoor Installation, Up to 6.5 GPM. These services will not be available during this timeframe. I strongly recommend not over-tightening the gas valve to the manifold. Be sure all connections are clean and tight. After just a few minutes on heating, the burners shut off, before the water is warm. One safety trip is the rollout switch. (Be sure that it is leaking and not just condensating). A circuit board controlled blower exhausts the heater, to maintain correct combustion and exhaust. It may seem counterintuitive to set your heater at a higher level if you want to save money, but remember, using a thermostatic valve, you will use less hot water, so there is a possible saving there. We utilize it in electric heaters to deliver temperatures between 65-75 degrees. More condensation than usual will build up because the air in the air-fuel mixture will be too high. The secret is a series of flow-altering jet ports that create counter-rotation and dynamic turbulence that effectively blasts suspension and prevents its accumulation. Products made by Bradford White are manufactured in the United States using the finest raw materials and components from around the world to deliver the highest quality and value to our customers. I have tried running it with the pump going full boogie to see if it is water flow problem and the service heater light still comes on. When the all clear signal arrives at the control board, high voltage is sent to the ignitor be it a hot surface ignitor or a spark ignitor. You can then set the water temperature lower in the thermostatic valve to ensure everyone is safe from scalding. Copyright 2022 In The Swim. Valve most likely needs replacing. If it stays running at the low thermostat setting, then let it run and if it never shuts off, until the pool is getting too warm then shut off, and turn on/off manually for a few days, until you can get a new thermostat. UPDATE. There are more complicated things here but lets keep this straightforward. If the return duct is crushed, then well have low airflow again. The mixed water will always come out at that temperature unless there is a water supply failure, then it will shut down for safety. Greetings Mr. Merino I opened pool 2 weeks ago, but only started heater last weekend. It is old and a bit rusty and loud. During this brief period, please contact us via email: techsupport@bradfordwhite.com warranty@bradfordwhite.com. I let it run and the temp slowly went up from 74 to 77 in just an hour without stopping. "contentUrl": "https://x1.adis.ws/v1/media/graphics/i/lesl/its-logo-wide",
On the other hand, if a tempering unit is being used, then hot water burns wont happen too quickly with a temperature of 50-degrees. It doesn't matter what the incoming cold water temperature is; it will lock in the temperature you set and keep it there. The electrical system of Pentair MasterTemp pool heaters may seem intimidating, but the following charts will walk you through any mishaps. Looking like might be bad control board? This will purge the lines of any excess air and sediment. Thats something to check for sure. It's also vital to check the output temperature setting on the new valve out of the box. http://www.haywardnet.com/pdfs/uhs-heater-troubleshooting-guide.pdf Page 37. Hot water tank started leaking form the base, no emergency service available from local service provider. Remember, Rheem tankless models need routine maintenance to remain energy efficient. We think so! A wiring schematic can be found in the water heater owners manual. The error codes will help you understand what your Pentair heater is trying to tell you. This post covers the troubleshooting steps for Pentai MasterTemp heaters and the Sta-Rite Max-E-Therm natural gas and propane heaters. The work was efficient, the men polite and respectful. A furnace thats been off all summer can be the victim of a spider spinning a web inside the burner orifices. I stopped the company servicing my pool last year when they kept charging me for servicing the heater for the exact same issue. The LED on the back panel indicated HLS. The green valve is commonly used for gas systems, such as tankless continuous flow models. "keywords": "",
1st one is the initial issue. When a furnace begins a new cycle, the inducer motor is the first thing you should see kick on. The ignitor kicks on, the gas valve opens, and the flame sensor senses that the flame exists. Before inspecting for leaks, turn the unit off. Sometimes youll get a little part of the flame that drifts off to the left or right, sending the switch off. The black valves are used for low-pressure gravity feed or large capacity systems. However, when the tap is turned on, the water is mixed with cold water to maintain a temperature of 50-degree. This post may contain affiliate links or mention our own products, please check out our disclosure policy. I think its a bit on the high side. You may have plugged burner orifices. As this invoicing removing an existing inside heater and replacing it with a model that goes outside, that came out to have a look as in was not a quick replace. An HVAC company would install it as well, or an Appliance company. The gas coming from the utility company or the propane tank in the back yard is free to flow on to the ignitor. The heart of Bradford Whites Defender Safety System is the patented flame arrestor design with ScreenLok Technology. Click here to learn how to test a thermocouple using a volt Ohm meter. Open a nearby hot water faucet to let the air out. It fires up fine again then the same thing happens. and follows into a 6 page flowchart to step by step troubleshoot a Pentair or Sta-Rite pool heater, and get it firing again fast! Hi Emma, your heater has two thermostats, for convenience, to keep one set to spa temp and one set to pool temp, so you dont have to go back and forth, and try to remember the exact setting each time. And dont forget to check the outlet side when the gas valve is on. All Rights Reserved. The Hydrojet Total Performance System is an innovation that separates Bradford White from the competition. This does require one special tool, pictured Disclaimer: Working with propane and electricity can be dangerous. It flicks off, and you can set the temperature using a screwdriver. The Atmospheric Vent FVIR Defender Safety System Models Feature: Bradford White ICON SystemIntelligent gas control with proven millivolt powered technology and built-in piezo igniter. Several issues can cause this; Circuit overload; Ground fault surges Refill the Water Heater Tank . Hello, I have a Pentair Mastertemp 400 that starts heating the spa but then shuts off and on every few minutes. Use caution when opening the valve as scalding could occur if hot water is present. 3345 Sunrise Blvd.Suite 5Rancho Cordova, CA 95742, Mon Fri: 7:30 am 5:00 pmSat: 8:00 AM 2:00 PMClosed Sunday, HomeAboutServicesFinancingReviewsLearning CenterService AreasContact, Mitsubishi Variable Speed Ducted Heat Pump, great video that shows what a dirty evaporator coil looks like, What to do When Your Heater Stops Working After a Storm, 14 HVAC Clichs to Avoid: Salespeople and Their Unoriginal Myths, Sacramento New AC, Furnace, or Heat Pump 2022-2023. Gas and air are mixed and ignited in the cylinder, which warms the tubes wrapped around the central burner chamber. Also, dont bend the manifold when youre trying to remove the gas valve or put the new one back on. However, if you are unsure, we recommend hiring expert services for Noritz tankless water heater troubleshooting. How to Fix Common RV Water Heater Problems, Problem: Pilot stays on, but main burner wont light, Problem: Wont ignite (Nothing happens when the switch is turned on inside the RV), Problem: Sparks appear at the igniter, but wont ignite, Problem: Main burner roars excessively, causes soot around the exhaust port, or has a yellow flame, Problem: There is no hot water when operating the water heater solely on electric, 9 Ways To Conserve Power While Youre Boondocking, How To Jack Up A Travel Trailer For Maintenance. Serial # HK15769973 Model # MI403S8FBN. WebAO Smith Water Heater Manuals & Troubleshooting Guides. This gas water heater troubleshooting guide is not meant for one specific brand or a model. Expansion Tank Has Excess Water and Inadequate Air, How to Troubleshoot a Steam Radiator That's Not Getting Hot, What to Do When Your Water Heater Is Making Noises, The Differences Between a Boiler and a Water Heater, 7 Types of Home Heating Systems and How to Choose One, Steam Boiler: Function, Types, and Installation, 6 Common Reasons Your Gas Water Heater May Not Be Working, Convection vs. Hydronic Electric Baseboard Heater, 7 Types of Water Heaters and How to Choose, How to Fix Inconsistent Water Temperature. Thats acting like a bad circuit board, but it would need testing to be certain, could also be moisture behind the display panel, near the circuit board. Your Atwood water heater may lock out if there is no gas flow. A boiler is a bit more complex than a forced air furnacein that it has more parts, valves, and controls. Lets see a few types of tempering valves. SFS is stack flue sensor. (See our video on ignitors for an in-depth explanation of this topic.). Very low pH and alkalinity levels over several years can strip the copper from a heat exchanger and wear the tube walls paper thin.Saltwater pools can How To Fix: Changing the gas control valve is not as difficult as you assume. We received direct quotes from the manufacturer which was $300 more than this business, yet this business was able to deliver on time, professionally and working 100%. Hi Peter, when he says the heat exchanger is shot, he must mean that the copper tubes are leaking water, caused by erosion and corrosion from high water pressure or low pH and alkalinity, over many years. By knowing the basics of RV water heaters in advance, you might just save yourself the headache of breaking camp and heading to an RV repair facility. "@type": "Organization",
It was installed where one return line is completely open and the other one is only slightly open. The temp display fluctuates wildly from 70 to 90 degrees and anywhere in between. Video. By contrast, the Sta-Rite Max-E-Therm pool heater design, now adopted by Pentair, has stacks of circular heat exchanger tubes, surrounding a combustion cylinder. Keep the hot water faucet open for three minutes after obtaining a constant flow of water. I also noticed that the flap wasnt opening even at 3450rpm and 20-25psi. So, after the board senses the pressure switch and inducer motor are working: The ignitor is supposed to come on for a set amount of time: 30 to 60 seconds. Most people would probably agree that stepping into a cold shower is definitely one way to wake up on the wrong side of the bed, especially on those already chilly summer mornings.. Modifying the hood and adjusting the gas pressures were recommended to us, which seemed to fix it. If the flame does anything but shoot directly into the hollow metal heat exchanger, a safety can trip. The rod, which should be cleaned annually, by the way, will heat up and send a millivolt signal down to its ceramic base and on to the control board. The burner is located in the center of the combustion chamber, wrapped by the circular copper heat exchanger tubes. when temp is down it kicks on as soon as it goes over setpoint it shuts off. Remember the video I did on printed circuit boards? So instead of needing additional external equipment like conventional tankless, the Infiniti K Series uses SteadiSet Technology to respond instantly to changes in demand and keep water temperatures stable reducing operating costs and increasing efficiency. Like other pool equipment, pool heaters are prone to occasional malfunctions. The enamel tank lining and protective features are effective for the lifetime of our reliable water heaters. Even the secondary heat exchanger uses smooth tube construction to reduce internal and external sediment build-up. The other safety trip that can cause the system to cut the gas off to the valve is the high limit switch. Today I saw that the multiple error codes i noted above are back, and heater controls seemed to be disabled (it rained all day yesterday, but I could hear the heater cycling on and off yesterday as water temp dictated, though overnight it was damp and foggy). RV water heater trouble shooting can be easily and quickly performed with a little knowledge and basic tools. This will save you money and allow you to raise the heater temperature to ensure all bacteria are eliminated. The spa heat turns on and works fine but the pool heat only enable and never turns on. This hotter water is then blended with cold water using a dynamic mixing valve to achieve the desired output temperature. "width": "611",
In these systems, once the radiator or baseboard convector absorbs heat from the hot water, the cooled water returns back to the boiler to be reheated, and the water circulation loop continues. If you're not confident with copper work, then. 02:24. Check your installation guide as a reference for where the settings should be. Thoughts? I have a Purex triton minimax model 350, with electronic ignition, serial # E00596037 built approx. Hi Lance, those are good ideas, first lets think about flow rate. Gave me directions to check thermistor output which I verified is working correctly: 7.7K ohms for 89 degree water. The major components of the boiler for a hot water (hydronic) system include: If your boiler isn't producing any heat at all, check for these common causes: Common problems that would cause a boiler not to heat properly include: This is usually dueto an improperly charged expansion tank. You are going to need to divert the hot water feed (1) and the cold feed (2) to the water heater through the thermostatic valve (4). The orange valve is used for a heat pump or solar hot water system. It is used to manage the temperature of the water by mixing hot water and cold water. One hundred twenty volts are applied through the wires coming from the control board. Get an Outstanding Quality Service, from a Sydney Plumber you can trust and afford. That gas valve is whats regulating the flow of the gas. }
. Fitting a thermostatic mixing valve in the hot water line from your water heater will allow you to keep the water heater temperature up to 120 F or slightly above. The flame might be coming on for a few seconds but then shutting off. Here is what you will need to check: If you didnt find a supply issue using the above steps, here are the most common problems with RV water heaters and how to hopefully correct them. And put the sticker on the gas valve that says LP. The hot and cold sides are marked clearly. "wordCount": "693",
In newer systems, the diaphragm expansion tank may be attached to the boiler piping near the boiler. Next, the gas valve opens. The water circulating through the copper heat exchanger tubes absorbs the heat, and exits the heater a few degrees warmer than when it entered. thoughabout 3.5 water columns (wc). in 1995. This is a standard by which Bradford White strives to consistently provide better safety, reliability, and performance. It sits in a pool shed, with decent, not great ventilation. How to Use the Blowdown Valve - Steam Boiler Low Water Cutout Valve Flushing Procedure. And towards the end, Ill give you ten things to check when youre troubleshooting a furnace gas valve. So, you may not require a tempering valve for this. An automatic spray application system maintains consistent thickness to produce a superior, durable, corrosion-resistant, and long-lasting tank lining. Ensure you and your family are safe from scalding and save yourself money by using your expensive hot water wisely. Gentlemen, I run the heater and this time it did something different. Add to I was able to power heater off, then pool-on, and I could see 78 deg water temp registered, and with 80 deg setpoint, burner kicked on ok. 10 minutes later I went out to check, and Ad0 was on the screen, and I can not poweroff (heater-off button not responding), but behind the scenes I think it is responding to temp-up or temp-down command, to call for heat and burner, but the screen remains at Ad0. It continuously bounces between pool and spa. Repair should never be attempted. To better serve you, our valued customers, we are performing a system maintenance that will temporarily interrupt our phone and voicemail systems on Tuesday, August 10, from approximately 8:00 PM-10:00 PM ET. The first thing I would check is to see is if the evaporator coil is dirty. A thermostatic valve will prevent burns due to unexpected changes in water temperature. The tank of a water heater consists of a steel outer jacket that encloses a pressure-tested water storage tank.This inner tank is made of high-quality steel with a vitreous glass or plastic layer bonded to the inside surface to prevent rusting.In the center of the tank is a hollow exhaust flue through which exhaust gases from the burner If the unit works as intended while the sensor is disconnected and no signs of leakage are visible, replace the sensor. If you are going to do it yourself, purchase a suitable three-way thermostatic valve such as this one fromCaleffi. After all, camping without hot water is not any fun. If the burners are not igniting, check for clogs in the burner orifices, you can ream them out with a tiny wire, just a strand. Cupro Nickelheat exchangers can be used for much greater resistance to the effects of salt water corrosion. It does heat the spa about 1 degree every cycle. If 12 volts is present, try lightly tapping the valve as it may be stuck, otherwise the valve most likely needs replacing. It heats water as it passes thru the unit, instead of storing hot water like a traditional tank water heater. Still have the power light lit but no other lights are lit. However, in the laundry and kitchen, this requirement can be bypassed and water can be fetched directly from the gas or electric unit. The lower jet ports direct the flow inward to increase pressure and turbulence. It doesnt help when the valve is off because no gas is flowing through it. B) With the power shut off and the wires disconnected from the element, check the element for resistance using a volt Ohm meter. Get daily tips and tricks for making your best home. I have replaced the Stack sensor thinking that it was the problem. The biggest fear about theheat exchangeris that corrosion can occur to the relatively soft copper finned tubes, causing them to develop pinhole leaks. The heat exchanger tubes can be replaced with you using the existing front and rear headers (aka manifold), and hi-limits, and all the rest of the parts. Leaking heat exchangers are often confused with sweating or condensating heat exchangers. To double-check, take the leads off to the gas valve and check there. WebThe ICON System set the standard for intelligent residential gas controls when it was introduced in 2009. Thanks for your help! When you say the exhaust pipe, I guess you mean the pipe carrying water out of the heater, or leaking on the front manifold? 2023, Bradford White Corporation, USA. The expansion tank must be properly charged with air to prevent water in the system from boiling and exceeding the desired 12 psi of pressure. Hello, I have a Mastertemp 200. We have a Pentair minimax 100 Dsi. Voltage can be interrupted by the thermostat or high limit switch which has a reset button. So Im very happy. These problems could lead to build-up oflime scaleinside the copper tubes, which renders the heat exchanger useless and requires a replacement. It may be factory preset to 110 F, but always check and reset it to the temperature you want before installing it. We sincerely apologize for any inconvenience.
Burner pulsates or surges, especially on ignition. When it comes to troubleshooting a furnace gas valve, theres also a setting for low fire on two-stage units that needs to be checked. The ICON now has a new larger knob for easier grip and pilot lighting. This sequence will happen in three stages and even if one step of this doesnt perform, each part is still going to do its thing sequentially once the board gives the signal. If no flame is sensed, the board will shut power off to the gas valve. But, in the closest tap, the flow of hot water should be minimum 4L/ min to correctly check the efficiency of the tempering valve. "height": "219",
The Service Heater light comes on when the heat shuts off, seems to reset after a minute or so, then the Service Heater light turns off and the spa starts heating again. It calls for heat, heat starts for maybe 5-10 seconds, then stops, temp raises rapidly to 124 then slowly back down to 75 and cycles again doing the same thing over and over again. Might charge under $500 to install. Check the wire going to the sensor and the sensor itself. Please wait as we prepare your PDF. we have a Pentair mastertemp 400K; We just had it installed last fall. How to test your water heaters T&P valve; Replacing a water heater drain valve; How to replace an anode rod (if water rusty or smelly) How long does a water heater last? 12 Volts DC (aka battery power): If you have a DSI water heater, you will need to verify that a full 12 volts DC is reaching the water heater when the water heater switch is turned on inside the RV. This gas water heater is sufficient for a small family of 4. There will be air in the system, which will clear once the tank is full again. And usually, the installer of the equipment will dial in the outlet pressures on start-up. Save Space - Traditional tank heaters take up a lot of space, but EcoSmart's sleek, wall-mounted design frees up A) When 12 volts reaches the board (assuming the board is properly grounded), three things should happen: 1) The board will begin discharging high voltage to the igniter. Adjust if needed. And cracked heat exchangers can introduce the spent gasses inside the heat exchanger to be carried along with the heat blowing into the house. His home repair articles for The Spruce span more than 10 years. When this happens, high limit switches will start opening, causing intermittent operation. Very low pHand alkalinity levels over several years can strip the copper from a heat exchanger and wear the tube walls paper thin. will also contain an electric element which can be used in place of propane or used in conjunction with propane to heat water faster. For an electric hot water heater, hit the reset button if there is one, or unplug the water heater for a couple minutes, and then plug it back in. However, this temperature can cause burns in 1 second. You will have to adjust the run of the pipes to accommodate the length of the valve or use suitably rated flexible connections. This will help future HVAC technicians when they service the furnace. Open both the cold water inlet valve and the nearest hot water faucet. Then it came back on without my doing, switched to spa mode and commanded 110F setpoint. In hydronic radiant systems, thermostatic valves allow the temperature to be higher. Some people will literally take a wrench and bang on the gas valve to get it to open up. The Eco-Defender Safety System features a different burner to maintain its Low NOx emissions while resisting the ignition of flammable vapors that can occur outside the water heater. This can cause cycling. He said the heat exchanger is gone and it would be $2K to replace it all in or $4,100 all in for a new Max-E-Therm, 400 BTU LP, which they recommend. Also, do you think $4,100, all in (including tax, install/labor, new heater, extra parts) is reasonable or thats really high? After this, the plumber may switch on the valve to set it to 50-degree temperature. Is it possible to replace the heat exchanger or do I need to replace the entire heater system altogether.

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water heater gas control valve troubleshooting