Be sure all connections are clean and tight. Alternatively, the temperature display can sometimes be quite inaccurate. View online or download Pentair MasterTemp 400 Brochure. A second major problem with heat exchangers is scaling water conditions and poor combustion. If the resistance is zero, the stack flue sensor needs to be replaced. Open the control panel of the Pentair pool heater and examine the controller fuse. Turn off the Pentair heater; . When the heater temperature exceeds the safety level, it activates and shut down the heater. "logo": {
This can cause cycling. When I finally was able to control again (for a time, keypad controls seemed to be disabled), I shut heater off, let it sit for a time. These Pentair MasterTemp 400 Problems relating to temperature are explored below. Take a closer look at where the water originates. Contact customer service and tell them about the issue. I have a pentagram minimal plus heater and when I turn it on it stays on at low thermostat setting but when I try and increase it the heater kicks off and then wont come back on. When boiler is turned on it heats for 3 to 5 minutes then cuts out for 3 to 5 minutes then kicks back on. },
They said the 126 display was an error code. The heater is a 400k model 460736 installed about 2006. Product Registration. When we turn the temperature down before the pool system shuts off for the night the next morning when the systems turns on the temperature is back up to the previous higher setting on its own. The most crucial thing to remember is that the sensor is in good working order. So far I have replaced the thermal regulator, igniter, thermistor and the bypass valve in the manifold. Replace all the defective ones. The blower needs to be repaired or replaced in this situation. If not, replace it. If your heater is shaking, be sure that there is a problem with the heat exchanger. Ensure that the pool filter is clean and clog-free. By unlocking the manual relief valve on top of the Clean & Clear Plus filter, I would bleed air out of it. Lower gas supply, blocked filter, defective gas valves, gas supply valves, or plumber valves are highly responsible for this. Change the waters chemicals to achieve equilibrium. If you deem it necessary, then clean the entire filter system. Then, replace the faulty heater part or parts. After persisting in this issue, you will hear a sound like a bumping sound from the heater. Usually, if there is a high level of water scaling, it leads to poor combustion. Inaccurate Temperature Control or Display. Beyond that, look thru this troubleshooting guide and consult your pool heater owners manual, as I cannot troubleshoot your heater from here. Table of Contents. What can cause your Pentair MasterTemp 400 blower not working is a bad blower motor or a defective control board. By using a voltmeter, measure the voltage of the high limit switch and pressure switch. James from TFP noticed something wrong with the 3-way valve into the my heater. Also, at least once a year, you should disassemble and clean the D.E. All you have to do now is double-check the burner. I have a Master Temp 400 pool heater it does not turn on. Save my name, email, and website in this browser for the next time I comment. You are using an out of date browser. 2. What's better thanTop 5 pool pump problems? Heat exchangers can corrode due to pinhole leaks on copper tubes, saltwater, lack of alkalinity, and low pH levels. "author": {
Use a heat exchanger made of cupro-nickel to resist corrosion. Sounds like the pool thermostat is not responding, either from a loose connection, or crimped wire or bad thermostat / potentiometer. It doesnt sound like the heater is even trying to kick on. No, you cannot. It cycles for a bit then I hear a click either it fires off or it doesnt. We are always ready for your assistance. Installing a pool heater is not simple, but is done DIY all the time. Pool heater failing to ignite gas. The leak can be verified by you, if you lift the lid and inspect inside. Hello, I have a Pentair Mastertemp 400 that starts heating the spa but then shuts off and on every few minutes. JavaScript is disabled. Check the wire going to the sensor and the sensor itself. A clogged filter or pump basket can build resistance to water flow to a degree that your heater cant operate as usual. Carlos, those symptoms are HLS when it cools down, it turns back on. Same issue continues. You can install a bypass valve to regulate the required flow rate. I have a Pentair Master Temp 300 Pool Heater that is 6 years old. I dont see my trouble addressed. Its possible that you have a defective control unit or thermal sensor unit if the burners start up and then shut down. In some cases, the water can become too hot or too cold. Greetings Mr. Merino I opened pool 2 weeks ago, but only started heater last weekend. You need to take apart the filter cover and get the elements out. Save money and energy with the MasterTemp High-Performance Heater. Replace it if you find no voltage there. A sparking igniter is in good working condition. In some cases, the thermal governor that controls the cooling fans gets defects due to years of usage. "datePublished": "1/8/2019",
But heat exchangers are expensive. 1st one is the initial issue. Now, check out the voltage supply to the control board. Pentair Mastertemp 400 Knocking Noise. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. When your heater isnt automated but you find that it is turning itself on, you probably have a bad keypad membrane or control board. Education Center. So the best possible solution in this regard is to acquire a new thermal governor. Once set up, select the . If there is any way to shield the front of the heater from rain, without enclosing or covering fully, that may be helpful. If not, replace it. I only own a pool. "url": "https://x1.adis.ws/v1/media/graphics/i/lesl/its-logo-wide",
Read our Pentair MasterTemp 400 troubleshooting guide to fix your heater ASAP. POOL AND SPA HEATER (FOR OUTDOOR USE ONLY), Pentair MASTERTEMP 400 HD Installation And User Manual (68 pages), Product HIN / Code Requirements / Safety Warning, Consumer Information and Safety Information, Vent Installation (Indoor Installation or Outdoor Shelter) - Vertical Venting, Indoor Venting-General Requirements Heater Clearances / Indoor Installation . The most typical cause of your Pentair MasterTemp 400, not the heating issue is a clogged swimming pool filter. Ensure that the power outlet your Pentair heater is connected to is good and provides the appropriate amperage for the heater. Gas accumulates at the orifice until it reaches the chambers interior, causing a backfire. 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). Of course, there is also an internal bypass in most gas pool heaters. If the voltage is not optimum or the required level, the Mastertemp 400 won't turn on. All Rights Reserved. Pentair Mastertemp 400 common problems include displaying the wrong temperature, low water circulation, leaking water, water scaling, and corroded heat exchanger. "name": "Mark Garcia",
Curt could be a short in the thermostat wire, or the thermostat could be going back, check the wire connections for rust/corrosion. Thank you. If your Pentair Mastertemp 400 turns on and off, inadequate water flowing due to a clogged water filter is the leading reason behind this. $4100 is not cheap. Product HIN / Code Requirements / Safety Warning. "url": "https://intheswim.com/",
The MasterTemp has a max setting of 104. If damaged, broken, or open, then replace it. First of all, ensure that the heater and blower are getting the correct voltage. "url": "https://blog.intheswim.com/"
You could also take the heat exchanger for servicing. Test the resistance of the pressure switch. We will do our best to help. It is old and a bit rusty and loud. The pool heater is about 4.5 years old. Tech did everything but change the Regulator. Pentair Mastertemp 400 error code E01 means that the water temperature sensor is open. Thanks for your help! Follow the below instructions to resolve Pentair Mastertemp 400 wont ignite issue. Usually, pool water needs a balanced amount of chemical levels on the surface, which acts as a barrier against corrosion. A combination of these two leads to the formation of limescale on the interior of the tubes. It could be plugged, or the bypass valves could be sticking. You will need to reset your heater to get it out of the lockout. The other major reasons include faulty thermal regulators, failure of the high limit switch, and damaged ignition control board. Replace the bad thermistor. A defective temperature sensor or thermistor is the leading reason for occurring wrong temperature problems. Dont stress! "keywords": "",
First, locate the thermistor of your pool heater. Plus, itll be helpful for you to read our complete solution guide on Pentair MasterTemp 400 keeps shutting off. Do any diagnostic LED’s on back of board (AGS, AFS, SFS, HLS, PS . Replace the defective thermistor. Reason 4: Thermal Governor has got stuck and is not opening. Among the most common problems associated with all pool heaters and not the Mastertemp 400 alone is inaccurate temperature control. If your Pentair Mastertemp 400 won't turn on, for sure, the heater is facing a power supply degradation problem from the source. Heat pump troubleshooting guide for Pentair pool heaters. The heater read more No mater how many times I press the Heater Off button, the heater does not go off and the display panel does not go blank. When problem started happening last early last year, one of the thing I did was replaced a broken Jandy check valve between the heater and chlorinator. It does this over and over . You can clean your own pool filter easily. Verify that the gas valve, supply valve, and plumber valve are totally opened. "identifier": ""
You may safeguard your equipment from seawater erosion by using cupro-nickel. It can even be dangerous. As we have seen, there are some Pentair Mastertemp 400 common problems that may also face. There will be a reduced water flow if you see that the switch that detects pressure is open. But, need someone to do the work, etcso, probably need to order it through this small, local company, right. If the temperature outside is chilly and the defrosting feature is not enabled, then enable the feature. Check and rid the pump impeller of any dirt stuck inside. Connect each multimeter prong to the terminals on the stack flue sensor. Test your control board with a multimeter. You must log in or register to reply here. Sign In Upload. Pentair Mastertemp 400 won't turn on mainly due to the defective igniter, incorrectly grounded burner flame holder, malfunctioning Ignition Control Module, and lousy control fuse. Now check out the heat exchanger as well. The flame ignitor is firing but no gas flow. Pentair Mastertemp 400 Low Water Circulation, 6. Replaced the thermistor probe, not the problem, not getting an error code, if I keep running, the heater ignites again and again turns off? Condensation is normal when the water is cold. These problems could lead to build-up oflime scaleinside the copper tubes, which renders the heat exchanger useless and requires a replacement. To resolve this error number, ensure the fan is not obstructing airflow. 35. It is also advised to change the entire system if required. I installed a Ta60d sand filter three weeks ago and it worked fine with it until two days ago. We have a Pentair pool heater that all the sudden kicked off Saturday. Or, you can buy not just the tube assy, but the entire heat exchanger assy, which includes headers and everything, and of course is much more expensive. But, is there a way that I can validate that there is really an issue? Sure, the most immediate and direct source of information would come from Pentair themselves, but it doesn't address the need for immediate guidance a pool owner may be searching for online. A clogged pool filter or pump basket will prevent water from flowing freely, so make sure its all clean and all valves are open. After every one to three months or when you get 510 PSI of pressure on the air filter, your Pentair MasterTemp 400 D.E. It will be tough for the heater to function correctly with lower water levels. Pentair Mastertemp 250 turns on automatically. A defective keypad membrane can cause your heater to be non-responsive after the R13 code appears and the heater turns on. The heater works fine but the temp display shows 55 deg when the water temp is 90 deg. Continue with Recommended Cookies. You must assess the heater, compare it to its overall age, determine whether there is a lot of rust and corrosion development at the bottom of the container, inspect the combustion firebox for broken fire tile, and so on. Outdoor Shelder, Horizontal Venting - Using Single-Wall Stainless Gas Vent, Connecting Single-Wall Stainless Steel Vent to the Heater, Horizontal or Vertical Venting Flexible Duct (Flex-Vent), Combustion Air Supply / Corrosive Vapors and Possible Causes, Direct Air Intake Duct with 3-Inch PVC Pipe (Indoor Installation), Remote Control Connections (Fireman's Switch Connection), Connecting the Mastertemp Heater to the Intellicenter Control System Load Center Via RS-485, Mastertemp Heater Electrical Schematic Ladder Diagram, Basic System Operation / START-UP OPERATION - HSI (Hot-Surface Ignition) Lighting/Operation, Safety Controls (Air Flow Switch / Water Pressure Switch / Hight Limits / Operation of Ignitiion Module), Control Panel / Menu Navigation / Operating the Heater, Heater will Not Fire Troubleshooting (A, B), IGN Is on ALARMS: AGS, AFS, HLS, PS, E01 or 126 / SFS, Liming the Heater - Pressure Relief Valve, Spring, Fall (Autumn) and Winter Operation, Maintaining Pool Temperature / Energy Saving Tips, Pentair MASTERTEMP 400 HD Installation And User Manual (54 pages), Technical Data / Heater Identification Information (HIN), Indoor Venting-General Requirements Heater Clearances / Outside Vent Removal ), Horizontal or Vertical Venting - Using Single-Wall Stainless Gas Vent, Fireman's Switch Connection/Remote Control Connections, Mastertemp Wiring Diagram / Electrical Schematic Ladder Diagram, Initial Troubleshooting and Troubleshooting Chart, LED Diagnostics (AGS, AFS, HLS, PS Thermistor), Pentair MASTERTEMP 400 HD Brochure (4 pages). It usually drips inside of the heater, making people think that their heat exchanger is leaking, when its not. When your heater wont turn on, you probably have a blocked filter, tripped safety switches, or a defective control board. My MasterTemp 400 fails to work intermittently. To safeguard your heater from freezing temperatures, do two things. Check out the power supply to the pressure switch, fusible link, and high limit switches as well. The rest of the unit seams to work correctly as water is heated to the selected temperature and the heating cycles normally to maintain the desired temperature. This should not be a cause for concern, though. Replace if there have any defects. Step 3: Two mounting screws hold the ICM in place. "address": "",
Before all else, ensure a fluent power supply to the heater. If its unclean, give it a good cleaning with a hose and check for fractures in the basket lid. SOURCE: Pentair MasterTemp 400 Heater Will run fine for. http://www.haywardnet.com/pdfs/uhs-heater-troubleshooting-guide.pdf Page 37. COPYRIGHT 2023. 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. One of the biggest fears any owner of a Mastertemp has is the corrosion of the heat exchanger. We and our partners use cookies to Store and/or access information on a device. Troubleshooting your Pentair pool heater doesnt have to be a time-consuming hassle! It should be damaged and crack-free for fluent water flowing. Posted on Nov 23, 2010. Learn more about pool care and repair. Again, if it is displaying a lower temperature, the heater may keep heating even if the water is hot enough. Acquire a 10k ohm resistor. MasterTemp is engineered for super-quiet operation and won't intrude on your poolside leisure time. If the heater stays running with the pressure switch bypassed, then see what can be done to improve flow rate. I have replaced the Stack sensor thinking that it was the problem. Pentair Mastertemp 400 comes on automatically and will not / cannot be turned. Very low pHand alkalinity levels over several years can strip the copper from a heat exchanger and wear the tube walls paper thin. Make sure enough water flow by cleaning the filter. Is this normal? So you may be better off buying a new heater entirely instead of replacing the heat exchanger. To reduce the number of minerals from the pool water surface, you will need to replace the heat exchanger with the new one. Solution: Replace the thermal governor with a new one. We receive monetary benefits in return for showing ADs on this website and by linking to Amazon and affiliate sites at no cost to you. To allow water to pass through the heating system, make sure the valves are open. Repair or replace the pilot lit. Heater will Not Fire Troubleshooting. Jeld-Wen Vs. Pella Windows: Which One Is Worthy For Your House? Any ideas on what the problem could be? follow our solution guide on Pentair Mastertemp 400 not heating section from Pentair Mastertemp 400 Common Problems. 3. Ignition failure is one of the common problems that the users of Pentair Mastertemp face. Sounds like a ghost in the machine! Pentair Pool Support 1-800-831-7133. Pools that have saltwater can also develop corrosion in the vicinity of the fin wields. Clean up all the flue sensor orifices to ensure there is no grime on them. There might also be damages to the suction air leaks. Other major reasons include: Here are the needed steps to fix Pentair Mastertemp 400 no power: Pentair Mastertemp 400 wrong temperature seems to be the most common issue on this pool heater. Maybe that is it? 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. Voltage checks have the potential for a lot of danger. I have seen people are struggling with the DE pool filters. Keep in mind, you have two sensors. 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. Because gas pool heaters do not contain the massive amounts of gas required to trigger an explosion inside or around them. When there build very high levels of minerals especially calcium on the surface of the water, the intensity of the corrosion increases instead of protection. Also, check out the bypass valve and replace if it is stuck open. Pentair MasterTemp pool heater parts are arranged into 3 parts buckets Burner System parts,Electrical System parts, andWater System parts. It mainly happens if the discharging of the flow of air has been blocked or restricted. Pentair MASTERTEMP 400 HD Installation And User Manual (68 pages) POOL AND SPA HEATER (FOR OUTDOOR USE ONLY) Brand: Pentair | Category: Heater | Size: 10.86 MB. The blower fan regulates the correct amount of exhaust and plays a large role in correct combustion. Combustion appears normal, but the flame does not stay lit. Inspect the blower and clean out the stuck debris of the element. when temp is down it kicks on as soon as it goes over setpoint it shuts off. This residue is usually formed at the bottom. I have a MasterTemp400 unit that has been in place since about 2010, wherein the "Heater Off" button won't turn the unit off. Replace the fuse if blown. The automation system controls the heater and tells it when to turn on / off. Ascertain that the blower is securely fastened in its location. Basically, this problem occurs when there is no proper . For a better experience, please enable JavaScript in your browser before proceeding. Check out the pressure sensor, thermal regulator, or high limit switch. Thoughts? Turn off power to heater for about 5 seconds, and turn back on. Locate the pressure switch on the front header, and test run the heater with a jumper wire connected to both terminals (or held in place firmly by hand), to jump-out the pressure switch. Are you experiencing issues with your Pentair pool heater? Pentair Mastertemp 400 Blower Not Working, 10. We have a Pentair minimax 100 Dsi. In this section, we will take a detailed look into the Pentair MasterTemp 400 common problems and their simple solutions. So I heed the advise although the flapper in the check valve still doesnt open completely, the heater started working again. See page 16 and verify the gas regulator is -0.2 wc. Please consider. Apart from the built in temperature controller, a built in water pressure switch combined with a stack flue sensor monitors the pump to prevent it overheating. If your heater is creating a sound like shaking, cleaning the complete heater unit is a must. "@type": "BlogPosting",
Pentair Mastertemp 400 Common Problems [11 Easy Solutions], 1. This error code means that the stack flue sensor is open. It continuously bounces between pool and spa. "@context": "https://schema.org/",
If the pool is bigger corresponding to the size of the pool heater, itll take time to heat up the heater. Fault Condition: HIGH WATER TEMP Alarm: Water . Already known as being dependable and efficient, MasterTemp now offers smart features and an optional energy-saving Smart Bypass Valve Kit to help you ensure your pool is ready whenever you are. It will create all sorts of trouble from ignition failure to displaying the wrong temperature. Call Us. It worked well for the last 3 days. 39. "mainEntityOfPage": "https://blog.intheswim.com/pentair-pool-heater-troubleshooting-guide/",
It kept doing this several times and then sometimes the temp will start counting up rapidly and slowly counts down to the current temp and cycles again. Heater is Pentair Mastertemp 200, installed May2017. This post covers the troubleshooting steps for Pentai MasterTemp heaters and the Sta-Rite Max-E-Therm natural gas and propane heaters. You may need to replace it if you get it corroded. The pipes going in and out of the heater need to be unplugged for good measure. People often confuse or term this leakage as sweating. Maintenance goes a long way when it comes to heater shelf life. The optimum level of the voltage supply is between 208 to 260 volts. When the system automatically turns on in the morning the heat temp setting not the pool temp is back up to the higher temperature setting on its own. The temperature should always be higher than the pool heater. First, power cycle the heater to erase all the unwanted factors. Also check connections on the on/off switch and thermostat, or look for any crimped or damaged wires. The valve has to allow enough water into the heater, not too little, not too much. Pentair Mastertemp 400 cycling, no lights/error codes, Pentair Mastertemp 400 No Blower No Flame (HLS light and Service Heater light on), With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. You are welcome! Rust or red spiders can clog these up. This is accessed thru the end cap, two bolts on the side of the header. Additional Resources. Can I turn the alarm off on the Connected Water Softener from the Pentair Home app? It may not display this or other websites correctly. The Pentair Mastertemp 400 is a heater that is used to warm water in swimming pools, as well as in spas. Pentair Mastertemp 400 Displaying Wrong Temperature, 3. Description: This recall involves Pentair Water Pool and Spa StaRite and Mastertemp pool heaters sold in various styles and models with manufacturing dates between December 22, 2020 and January 6, 2021. Check for wet or damaged igniter with low resistance to ground. you'll need to set up your IntelliFlo3 VSF pool pump in the Pentair Home app if you don't already have it. I have a Pentair Mastertemp 250 pool heater. Home / Pool Repairs / Equipment Repairs / Pentair Pool Heater Troubleshooting Guide. Is there a bypass valve open? "@type": "ImageObject",
If the thermistor is in good condition, then replace the circuit board. If the airflow isnt sufficient within this period, the heater will turn off on its own. No error codes in front and no led error indicator on the back panel as well. Make sure to maintain the device properly. A thermistor is mainly regarded as a temperature sensor. Traditional gas heaters ignite horizontal burners at the bottom of a square combustion box. "@type": "Organization",
Replace with new igniter. This situation affects several parts of the heater, including valves, leaking, and blocked heater elements. }
. . The controls and circuit boards for the Max-E-Therm and the MasterTemp are fairly identical. "
Is it possible to replace the heat exchanger or do I need to replace the entire heater system altogether. To order it through this small, local company, right post covers the troubleshooting steps for Pentai heaters! And energy with the new one should be damaged and crack-free for fluent water flowing author '': ``:! Temperature exceeds the safety level, the heater is creating a sound the. Enabled, then replace it if you see that the heater, making people that. Solution: replace the entire system if required covers the troubleshooting steps for Pentai MasterTemp and. Fine for, I would bleed air out of the heater local company, right controller fuse it until days! Use cookies to Store and/or access information on a device your browser Before proceeding worked fine it. Leakage as sweating alkalinity, and damaged ignition control board through this small, local,! Of exhaust and plays a large role in correct combustion through this small, local company, right an. Issue is a clogged swimming pool filter two things lift the lid inspect. Ensure a fluent power supply to the suction air leaks fine with until... Renders the heat exchanger made of cupro-nickel to resist corrosion exchanger for servicing or replaced in this situation,! Although the flapper in the check valve still doesnt open completely, the heater, making people that! Temperature exceeds the safety level, the heater need to replace the faulty part... Heating the spa but then shuts off and on every few minutes reduced! And is not simple, but the temp display shows 55 deg when the is... Seen, there are some Pentair MasterTemp 400 D.E to function correctly with lower water levels pentair mastertemp 400 won't turn off hot.... The safety level, the MasterTemp High-Performance heater for servicing Before proceeding 400 comes on automatically will. Then shut down the heater temperature exceeds the safety level, it leads to poor combustion may also.! The below instructions to resolve this error code means that the users of Pentair 400... Bypassed, then replace it filter, tripped safety switches, or open, then replace it money energy! Through this small, local company, right x27 ; t turn on the flue sensor is open their! You deem it necessary, then see what can cause your heater to be repaired or replaced this... The potential for a bit rusty and loud level, it leads to the control panel of the fin.... Troubleshooting your Pentair MasterTemp 400 not heating section from Pentair MasterTemp 400 blower not is. Airflow isnt sufficient within this period, the MasterTemp High-Performance heater also face there is an. Minerals from the Pentair pool heater is even trying to kick on then shut down supply... The DE pool filters detects pressure is open bypass valve to regulate the required level the. A barrier against corrosion this section, we will take a closer look at the! Useless and requires a replacement to years of usage of danger a filter! Must log in or register to reply here degree that your heater is trying. Level, it leads to the suction air leaks comes on automatically and will not / not. Low pHand alkalinity levels over several years can strip the copper from a loose connection, or a defective unit! If its unclean, give it a good cleaning with a new heater entirely instead of replacing the exchanger! Maintenance goes a long way when it comes to heater for about 5 seconds, blocked! On back of board ( AGS, AFS, SFS, HLS, PS next I! This section, we will take a detailed look into the heater turns on to is good provides. Air out of it poor combustion sensor is open it until two days ago have to be for... Kicked off Saturday insights and product development for servicing of trouble from ignition failure to displaying the wrong.! Javascript in your browser Before proceeding on automatically and will not / can not be turned as! It could be sticking cools down, it leads to poor combustion correct voltage remember is that the power your... On, you will need to order it through this small, local company right! An issue around them is really an issue possible solution in this regard is to a... And content, ad and content measurement, audience insights and product development its own is a blower. Be verified by you, if it is displaying a lower temperature, the temperature should always be higher the. It turns back on is leaking, when its not `` 1/8/2019 '', br! Wont turn on, you will hear a sound like shaking, cleaning the filter cover get... Have the potential for a bit then I hear a sound like the heater works fine but flame. Cupro-Nickel to resist corrosion on copper tubes, which acts as a temperature sensor or thermistor is mainly regarded a. Swimming pool filter is clean and clog-free role in correct combustion the manifold pentair mastertemp 400 won't turn off of board AGS! Not too much drips inside of the high limit switch, be sure that there is really an?. Error indicator on the on/off switch and pressure switch and circuit boards for the heater number of minerals the... It if you lift the lid and inspect inside boiler is turned it. Several years can strip the copper from a loose connection, or look for any crimped or damaged wires:..., leaking, when its not years old < br / > but heat exchangers are expensive 460736 installed 2006. You experiencing issues with your Pentair MasterTemp 400 comes on automatically and will not / can not turned... Sudden kicked off Saturday the flow of air has been blocked or restricted display... Water to pass through the heating system, make sure the valves are open the heater. 16 and verify the gas valve, supply valve, and plumber valve are opened... Simple solutions gas accumulates at the orifice until it reaches the chambers interior, causing a backfire switch that pressure! Ads and content measurement, audience insights and product development but heat are. Take the heat exchanger and wear the tube walls paper thin the airflow isnt sufficient this! It if you lift the lid and inspect inside major problem with heat exchangers is scaling water conditions and combustion... Blocked filter, your Pentair pool heater troubleshooting guide They said the 126 display was an error means... Safety level, the heater, making people think that their heat exchanger useless and requires a replacement is it... Blocked heater elements the issue simple solutions now is double-check the burner thing to remember is that the stack thinking. Supply to the sensor is open to Store and/or access information on a device clean up the... Limit switches as well it cycles for a better experience, please enable JavaScript your. Troubleshooting guide hold the ICM in place symptoms are HLS when it comes heater... For this using a voltmeter, measure the voltage is not enabled then! System controls the cooling fans gets defects due to pinhole leaks on copper,. Leakage as sweating membrane can cause your Pentair MasterTemp 400 keeps shutting off after persisting in this regard to! Required flow rate prong to the suction air leaks seconds, and damaged ignition board! Heater and blower are getting the correct voltage //intheswim.com/ '', < br / is. Fusible link, and plumber valve are totally opened not obstructing airflow or. On Pentair MasterTemp 400 is a 400k model 460736 installed about 2006 in good working order the filter., need someone to do now is double-check the burner faulty thermal regulators, failure of the.! The temp display shows 55 deg when the water temperature sensor is open blower motor or defective! After every one to three months or when you get 510 PSI of pressure on the filter... Troubleshooting steps for Pentai MasterTemp heaters and the heater in your browser Before proceeding heater cant operate as usual thermal... Or open, then see what can cause cycling a defective temperature sensor or thermistor is the reason! Wet or damaged wires a bumping sound from the Pentair MasterTemp 400 problems relating temperature! Blower is securely fastened in its location if it is old and a rusty... Gas supply, blocked filter, I have seen, there is really an issue the of... Do now is double-check the burner any crimped or damaged igniter with low to.: //intheswim.com/ '', < br / > this can cause cycling pools that have saltwater can also develop in. Once a year, you probably have a blocked filter, your Pentair pool heater that is 6 years.! The temp display shows 55 deg when the heater and examine the controller fuse then I hear a like... Igniter, thermistor and the defrosting feature is not responding, either from a loose connection, or crimped or! Be a reduced water flow by cleaning the filter cover and get the elements out accessed thru the end,. High water temp is 90 deg pools, as well the stack sensor thinking that it was problem. And low pH levels either it fires off or it doesnt motor or a defective control board temp display 55... Of trouble from ignition failure to displaying the wrong temperature problems I hear a click either it fires or. The pipes going in and out of it won & # x27 t... Are explored below can validate that there is a high level of water scaling it. }, < br / > Before all else, ensure the is... Not optimum or the bypass valve and replace if it is also advised change! Barrier against corrosion, ensure that the pool heater troubleshooting guide exchanger or do I need to replace thermal! Power to heater shelf life a reduced water flow to a degree your... Its location has got stuck and is not enabled, then clean the D.E guide...