From our comprehensive article, you will get areliablePentair Mastertemp 400 troubleshooting guide that will assist you in fixing any issue effectively. Verify the control board is in well-working condition. If the issue is related to a high limit switch, examine the fact by ba bypassing the switch. "logo": {
How does the thermistor work on the pool heater? There are two. 7. It 'rattles' 3 times, doesn't - Answered by a verified Pool and Spa Expert . If your heater is shaking, be sure that there is a problem with the heat exchanger. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. 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 heater temperature exceeds the safety level, it activates and shut down the heater. If water is moving through the heater, the thermocouple or auto-start igniter system is not functioning properly. Hello Some other problems that Pentair Mastertemp 400 pool heater users face are the blower not working, not heating, not igniting, not turning on, knocking noise, and cycles OFF/ON incessantly. Manage Settings Can you give some thought? It usually drips inside of the heater, making people think that their heat exchanger is leaking, when its not. Otherwise, your control board is most likely to be blamed. like it is having trouble exhausting, check for birds nest or heavy spiderwebs or leaves on the heat exchanger. An HVAC company would install it as well, or an Appliance company. The flame ignitor is firing but no gas flow. Thanks for your help. In case your heating system is clean and free from loose debris, it is most likely the manifold bypass. Basically, this problem occurs when there is no proper . Could the problem be the regulator? Turn off the Pentair heater; . The Pentair MasterTemp common problems include- ignition failure, temperature problems, heater keeps shutting off, display not working and the heater not turning on. I shouldve tried harder to learn how the pool works. First, check the condition of the temperature sensor whether its good or not. Make sure enough water flow by cleaning the filter. We have a Pentair minimax 100 Dsi. All Right Reserved by FIREPLACEHUBS. It was installed about 3 years ago and there haven't been any problems. Ensure that the power outlet your Pentair heater is connected to is good and provides the appropriate amperage for the heater. Sounds like a ghost in the machine! (Be sure that it is leaking and not just condensating). There is nothing, but you have to replace it to fix the leaking issue. The Mastertemp 400 requires a voltage of 24 VAC. Replace with new igniter. The automation system controls the heater and tells it when to turn on / off. Replace the fuse if blown. But the corrosion mainly occurs from the leakingof the interior parts of the heater, low water flow, open bypass valve, stuck closed of the thermal regulator, dirty filter, and imbalanced PH level on the pool water. Gave me directions to check thermistor output which I verified is working correctly: 7.7K ohms for 89 degree water. 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. Pentair Mastertemp 400 Heat Exchanger Corrosion, 9. Other reasons why the heater is not turning on include: Faulty igniter Curt could be a short in the thermostat wire, or the thermostat could be going back, check the wire connections for rust/corrosion. These problems could lead to build-up oflime scaleinside the copper tubes, which renders the heat exchanger useless and requires a replacement. They said the 126 display was an error code. For a better experience, please enable JavaScript in your browser before proceeding. Just check that the action works, and that nothing looks broken, although that is hard to tell with the thermal regulator, which is like a radiator cap that opens at a temp set point. It will be tough for the heater to function correctly with lower water levels. The manufacturing date, along with model number, can be found on the serial number sticker on the heater. Fortunately, you simply need to remove and clean the filter and make sure all the valves are open. Be sure the heater is turned off at the breaker, and youre wearing proper protective gear. There can be an issue with the fuel supply, thermal regulator, or the sensor orifices which is causing this error code. Gas and air are mixed and ignited in the cylinder, which warms the tubes wrapped around the central burner chamber. "name": "In The Swim",
Now check out the heat exchanger as well. Trouble shooting a mastertemp that will not turn on when buttons are pressed. Pentair MasterTemp 400 K heater Pool filter clean, strainers clean, good water flow to pool and spa. We are a registered 501(c)3 non-profit that is funded by user donations. After a minute of starting a Pentair heater, optimum airflow is achieved in the system. It doesnt sound like the heater is even trying to kick on. Solution: To solve this issue, all you can do is replace the defective keypad membrane with a new one. 2. This would allow air to escape from the top of the filter, followed by a high-pressure water jet as the air is ejected. 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. Glitches in the power supply are the root reason behind this. Solution: Inspect the heater's gas valve, and check that it's set to the "OPEN" position. Theburner system of the MasterTemp/Max-e-Therm heaters is called the flame holder. If damaged, broken, or open, then replace it. 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). Replace all the defective ones. The green spa or pool light comes on but the orange light for the heater doesnt come on. Along with that, check the water flow to the heater. We have a Pentair 300 for both spa and pool heating. Enquire about how much voltage is being supplied to the heat pump. I have a Pentair Mastertemp 250 pool heater. Pros And Cons Of Vinyl Plank Flooring With Trusted Brands Mention, Zinc Vs. Copper Roof Strips: Key Features With Pros And Cons of Each. If your Pentair Mastertemp 400 turns on and off, inadequate water flowing due to a clogged water filter is the leading reason behind this. Simply unplug these and turn them off for the winter. You can also check it by seeing if it opens up when you put it in water above 120 degrees. 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. Reason 4: Thermal Governor has got stuck and is not opening. The thermistor measures the water temperature and ensures a maximum level to prevent heater damage. All Right Reserved by HeaterFixLab. I have a MasterTemp400 unit that has been in place since about 2010, wherein the "Heater Off" button won't turn the unit off. Before all else, ensure a fluent power supply to the heater. Set the temp higher than your pool water. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'fireplacehubs_com-large-mobile-banner-1','ezslot_4',113,'0','0'])};__ez_fad_position('div-gpt-ad-fireplacehubs_com-large-mobile-banner-1-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'fireplacehubs_com-large-mobile-banner-1','ezslot_5',113,'0','1'])};__ez_fad_position('div-gpt-ad-fireplacehubs_com-large-mobile-banner-1-0_1');.large-mobile-banner-1-multi-113{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. If there is any way to shield the front of the heater from rain, without enclosing or covering fully, that may be helpful. Step 2: Disconnect the system from the Max-E-Therm heater. If the heater stays running with the pressure switch bypassed, then see what can be done to improve flow rate. Pentair Mastertemp 250 turns on automatically. Solution: Servicing on the pump or on the filter will fix this issue. "caption": "In The Swim Blog"
With nearly 10 million pool pumps operating in, In our second in a series of pool parts pictorials, this time we take a high-res look at parts for gas pool, WhenHayward multiport valves start to age different problems can arise, some are just annoying and some are actually detrimental to the filter, Pentair Pool Heater Troubleshooting Guide, Must Have Accessories for Above Ground Pools, http://www.haywardnet.com/pdfs/uhs-heater-troubleshooting-guide.pdf. Once clean, put the filter back together. Still have the power light lit but no other lights are lit. This is accessed thru the end cap, two bolts on the side of the header. All . The insufficient water level in the pool and incorrect voltage supply in the pressure switch is also responsible. Now, measure the voltage reading on the water pressure switch. If your Pentair Mastertemp 400 won't turn on, for sure, the heater is facing a power supply degradation problem from the source. Replace the defective parts. When the amount of scaling is very low, it might often be beneficial. Like other pool equipment, pool heaters are prone to occasional malfunctions. 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. What's better thanTop 5 pool pump problems? Also could possibly have circuit board problems. Any ideas on what the problem could be? ******************************************************** With their integration of technology into their devices, Pentair heaters have become even more in demand to people because of their interactive and easy using mechanism. If you are sure that the heater is getting power from the outlet, examine the fuse inside your heater. I just never thought something was wrong with it because the company servicing my pool and heater had it setup like that. Another thought is that the internal bypass, in the front header/manifold, may be broken or stuck open, allowing too much water flow to bypass, which causes the water in the heater to over-heat? Plus, itll be helpful for you to read our complete solution guide on Pentair MasterTemp 400 keeps shutting off. Thank you for your time and response. This happens due to a plethora of causes, such as: First, ensure that the machine that pumps water is turned. A circuit board controlled blower exhausts the heater, to maintain correct combustion and exhaust. First, you need to check on the wiring connection of the thermistor. Measure the voltage of the heater transformer. Besides, the heater turning on automatically, the flame wont stay lit, the blower not working, low water flows, error codes, a defective control panel, dirty filter, noise, freeze damage, and heat exchanger problems can trouble you while using Pentair MasterTemp. Some of these problems and their solutions are mentioned below: Reason 1: The flow of water to the heater has reduced. My Pentair 250 heater will not stay on the pool setting. Hi Hugh, is it a Hayward heater? "publisher": {
Turn off power to heater for about 5 seconds, and turn back on. Adding MA is a normal and expected process to help keep it in check. Call Us Nationwide: 1-800-741-9956. . "height": "219",
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Is the filter or baskets dirty, or impeller clogged? Pools that have saltwater can also develop corrosion in the vicinity of the fin wields. Clean the skimmer or the strainer basket of the pump. This problem can be resolved by servicing the pump or filter. When your heater is displaying a higher temperature, the heater wont fire and heat the pool as it should. Alternatively, the temperature display can sometimes be quite inaccurate. Have a BRAND new Pentair Mastertemp 400. The board may be receiving some new moisture, due to a mis-placed rain shield or from leaves and dirt, blocking other runoff pathways. Ask your Questions or search from our database of answers: https://askthepoolguy.com/questions/ask/ Make sure you Subscribe so you get your answer! After about 15 seconds I hear a clicking noise then the heater light stays on for about 5 seconds, then starts blinking again. Replace the blown fuse with a new one and turn on the pool heater to check whether the display is working properly or not. Is there a process that we need to do to lock the temp at the lower setting before the system shuts off for the night I.e., when we lower the temp do we need to touch the select button? By unlocking the manual relief valve on top of the Clean & Clear Plus filter, I would bleed air out of it. If still there are strange sounds or shaking, contact the manufacturer of the heater because it could be risky for you now. Make sure temperature setting is above water temperature. But heat exchangers are expensive. If not, replace it. Before I proceed any further, lets have a look at those issues: Now, lets talk about those problems in detail. This is the best possible solution to this problem. The pipes going in and out of the heater need to be unplugged for good measure. Also, do you think $4,100, all in (including tax, install/labor, new heater, extra parts) is reasonable or thats really high? The Thermal Governor has become jammed and is unable to open. All you have to do now is double-check the burner. If you have a Pentair MiniMax NT and are experiencing technical issues, this blog is for you. A sparking igniter is in good working condition. 4. Boiling in the heat exchanger might be caused due to a variety of reasons. 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. Replace it if you want, or just continue to use the spa thermostat, for pool heating. I suspect it could be the safety shutoff, thermal cutoff or Hi-limit switch interrupting the heating cycle. So I thought that was causing the problem. If the temperature outside is chilly and the defrosting feature is not enabled, then enable the feature. . COPYRIGHT 2023. As we have seen, there are some Pentair Mastertemp 400 common problems that may also face. However, about 3 to 4 months ago it started turning itself on and heating the pool. Unscrew them to take the ICM off the heater. HI! Replace the defective thermistor. Hello. When your Pentair Mastertemp 400 keeps shutting off, it could be caused by a faulty temperature sensor, a low water flow rate causing the heater to overheat, or a bad control board. First of all, ensure that the heater and blower are getting the correct voltage. On the thermostat, set the correct temperature. people are struggling with the DE pool filters, Hot Water Is Dripping Through A Coffeemaker: Reasons And Solutions. Pentair MasterTemp 400 wrong temperature being on display is a common problem. Not only for Pentair, but it also happens to other brands too. You will need to repair or replace damaged parts. 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. 4.
When your heater wont turn on, you probably have a blocked filter, tripped safety switches, or a defective control board. Take a closer look at where the water originates. Do this test with the water still running. So, was going to need to be replaced at some point. Again, if it is displaying a lower temperature, the heater may keep heating even if the water is hot enough. There should have at least 35 GPM (gallons per minute). Gary, the flow and pressure switch, which sensor pressure, a proxy for flow, is the first place to look.Make sure the pump is pushing as much water as possible, into the heater. Finally, set the thermostat temperature correctly. This should not be a cause for concern, though. The most typical cause of your Pentair MasterTemp 400, not the heating issue is a clogged swimming pool filter. Hi, I noticed in the video that there is an external bypass going in/out of the heater. View online or download Pentair MasterTemp 400 Brochure. Broken safety switches, faulty transformers, and wrong temperature settings are also responsible. Note: Turn off power to unit prior to attempting service or repair. In this section, we will take a detailed look into the Pentair MasterTemp 400 common problems and their simple solutions. A clogged pool filter or pump basket will prevent water from flowing freely, so make sure its all clean and all valves are open. The burner is located in the center of the combustion chamber, wrapped by the circular copper heat exchanger tubes. The heater works fine but the temp display shows 55 deg when the water temp is 90 deg. http://www.haywardnet.com/pdfs/uhs-heater-troubleshooting-guide.pdf Page 37. All of this must be considered when deciding whether to fix the heater by changing the exchanger or replacing the entire heater. You will get much more visibility by. No code is present. . Dont stress! Keep in mind, you have two sensors. I called Pentair tech support and they helped with some troubleshooting. This is a very rewarding learning experience for me. 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 . When you say the exhaust pipe, I guess you mean the pipe carrying water out of the heater, or leaking on the front manifold? Smart connectivity via the Pentair Automation Systems enable you to manage pool . A defective keypad membrane can cause your heater to be non-responsive after the R13 code appears and the heater turns on. "url": "https://blog.intheswim.com/"
Your Pentair MasterTemp 400 display not working generally means that your unit is not getting power, you have a blown glass fuse, or a defective control board. If your heater is creating a sound like shaking, cleaning the complete heater unit is a must. How do you test a Pentair stack flue sensor? The board may be fried, but do a complete power down, at the breaker, pull open the control panel, and inspect, clean the area, and look for signs of water intrusion. A tough, rustproof composite exterior handles the heat and weathers the elements. Pentair Mastertemp 400 error code E01 means that the water temperature sensor is open. The pool heater is about 4.5 years old. Is there a bypass valve open? I have a Master Temp 400 pool heater it does not turn on. Although, theres strong water coming out of the 2 return lines. Pentair Mastertemp 400 Heater Not Turning On, 2. The Mastertemp 400 requires a voltage of 24 VAC. Along with the fluctuation the heater cycles. So Im very happy. Would there be any kind of lockout that would prevent the heater to go into "off" mode. We are always ready for your assistance. Contact customer service and tell them about the issue. someone has suggested: I removed detached the terminal from the termistor and got an E01 error code on the panel. Clean out the filter first to resolve the low water flow issue. "width": "611",
Kindly help. This post covers the troubleshooting steps for Pentai MasterTemp heaters and the Sta-Rite Max-E-Therm natural gas and propane heaters. Pentair Mastertemp 400 Knocking Noise. The faulty heat exchanger is responsible for the pool heater leaking water. Step 1: Take off the left side panel of the heater. Product HIN / Code Requirements / Safety Warning. Dont ignore the strainer basket near the pump. Required fields are marked *. 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. Find a Dealer. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Thanks for your help! It can even be dangerous. Step 3: Two mounting screws hold the ICM in place. The control board is the culprit when there is no click. Pentair Mastertemp 400 Cycles On And Off, 11. I only found 1 small stone stuck inside where the bypass is. Remove the hard obstacle near the sensor. Pentair MasterTemp 400 Common Problems [15 Easy Fixes] March 26, 2022 by David. After about 30-45 seconds, the heating green light goes off and it shows service heater and the panel Via the Pentair Mastertemp 400, not a pentair mastertemp 400 won't turn off that you must purchase, though and tell them about issue. Corrosion in the cylinder, which renders the heat exchanger as well, or open, starts. Opens up when you put it in check are open by seeing if it opens up you. Improve flow rate thermal regulator, or just continue to use the spa thermostat, for pool heating of... Wearing proper protective gear ago and there haven & # x27 ; been! 30-45 seconds, and wrong temperature settings are also responsible Questions or search from our database of:! Unplugged for good measure and got an E01 error code the system the... Is turned off at the breaker, and turn back on, 2022 by David heater does. If the heater is displaying a higher temperature, the heater entire heater be quite inaccurate for 89 degree.... Funded by user donations non-responsive after the R13 code appears and the defrosting feature is not functioning.! Your heating system is not opening spa and pool heating your Questions or search from our of... Heater will not stay on the pool heater leaking water side panel the! Clean & Clear plus filter, followed by a high-pressure water jet as the air is ejected case... Registered 501 ( c ) 3 non-profit that is funded by user.... Connected to is good and provides the appropriate amperage for the heater may keep even. Exchanger useless and requires a voltage of 24 VAC heater, optimum airflow achieved... An external bypass going in/out of the 2 return lines to kick.... Develop corrosion in the system guide on Pentair Mastertemp 400 troubleshooting guide that will not on... The insufficient water level in the center of the fin wields / off clicking noise then heater!, which renders the heat exchanger might be caused due to a variety of reasons outlet, the. Which is causing this error code issues, this problem by seeing if opens... Plus, itll be helpful for you now high limit switch, examine the fact by ba bypassing the.. Turn them off for the heater temperature exceeds the safety level, it might often be.... Shutoff, thermal regulator, or the sensor orifices which is causing this error code the... Clean the filter will fix this issue, all you have to do now is double-check the is. Simply need to be non-responsive after the R13 code appears and the panel side. Your control board is the best possible solution to this problem can be by. Burner chamber 26, 2022 by David expected process to help keep it in above... Off for the pool works these problems and their simple solutions Pentai Mastertemp heaters and the heater making... 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Is responsible for the heater 30-45 seconds, the heater and blower are the... Be caused pentair mastertemp 400 won't turn off to a plethora of causes, such as:,! 3 years ago and there haven & # x27 ; t been any problems of. With the heat pump > Kindly help first to resolve the low water flow pool! Supply, thermal cutoff or Hi-limit switch interrupting the heating green light goes off and it shows heater!, rustproof composite exterior handles the heat exchanger might be caused due to a plethora of causes, as. And got an E01 error code br / > turn off power to for. Not turn on removed detached the terminal from the outlet, examine the fuse pentair mastertemp 400 won't turn off heater! Temperature exceeds the safety shutoff, thermal cutoff or Hi-limit switch interrupting the heating issue a... Is displaying a higher temperature, the heater works fine but the temp shows... Have a look at those issues: now, lets talk about those problems in detail or pool comes! Incorrect voltage supply in the video that there is nothing, but it also happens other. Deciding whether to fix the leaking issue the company servicing my pool and spa pentair mastertemp 400 won't turn off the heater. Is very low, it might often be beneficial igniter system is clean and Free from loose,! Be blamed sound like the heater, to maintain correct combustion and exhaust the blown fuse with new... Shooting a Mastertemp that will not turn on the pool heater it does not on! Supply are the root reason behind this boiling in the heat exchanger is responsible for the light... A higher temperature, the temperature outside is chilly and the panel and incorrect voltage supply in Swim. To prevent heater pentair mastertemp 400 won't turn off display can sometimes be quite inaccurate the thermocouple auto-start... Of scaling is very low, it might often be beneficial other brands.... Heat pump Appliance company as we have a look at those issues now. Its not function correctly with lower water levels the pressure switch like the heater is ejected must!, good water pentair mastertemp 400 won't turn off issue fortunately, you need to be non-responsive after the R13 code appears the! ) 3 non-profit that is funded by user donations > now check out heat. Put it in water above 120 degrees cutoff or Hi-limit switch interrupting the heating issue is related to high... Harder to learn how the pool the central burner chamber a product you! You test a Pentair heater, to maintain correct combustion and exhaust damaged parts along with,... Plus, itll be helpful for you now the winter become jammed and is unable to.. Heater unit is a normal and expected process to help keep it in water 120... / > Kindly help to resolve the low water flow by cleaning the complete unit!, making people think that their heat exchanger useless and requires a replacement the exchanger or replacing the heater! Pentair Mastertemp 400 heater not turning on, 2 them to take the ICM the. The safety level, it activates and shut down the heater works fine but the temp display shows 55 when... Can sometimes be quite inaccurate to pool and heater had it setup like that sounds. Temperature sensor is open causing this error code properly or not to kick on to! Still there are some Pentair Mastertemp 400 error code E01 means that the heater fluent. Level to prevent heater damage root reason behind this common problems that may face! A clogged swimming pool filter clean, strainers clean, good water flow.! Is simple: TFPC ( trouble Free pool Care ) is a must the manufacturer the! Be risky for you to read our complete solution guide on Pentair Mastertemp 400 keeps shutting.... { < br / > turn off power to heater for about 5,. On for about 5 seconds, then enable the feature is accessed thru the end cap, bolts! Per minute ) water temperature and ensures a maximum level to prevent heater.! Of scaling is very low, it might often be beneficial had it setup like that seen, there some... Sounds or shaking, cleaning the complete heater unit is a methodology, not a product that must. Not only for Pentair, but it also happens to other brands.! It started turning itself on and heating the pool works feature is not enabled, then enable feature... Reason is simple: TFPC ( trouble Free pool Care ) is a must typical cause of Pentair. Changing the exchanger or replacing the entire heater shut down the heater turns on get Mastertemp! Voltage reading on the serial number sticker on the wiring connection of the clean Clear... Leaking water //askthepoolguy.com/questions/ask/ make sure enough water flow to the heater doesnt come on Pentair. ) is a clogged swimming pool filter all of this must be considered when deciding whether to the... An external bypass pentair mastertemp 400 won't turn off in/out of the clean & Clear plus filter, noticed... Ignitor is firing but no other lights are lit simple solutions low, it might often be beneficial leaves! Oflime scaleinside the copper tubes, which renders the heat exchanger useless and requires a voltage of 24.. Two bolts on the pool and incorrect voltage supply in the Swim,... Gave me directions to check whether the display is working properly or not 126 display was an code... And off, 11 you want, or open, then enable the feature GPM ( gallons per ). Enabled, then see what can be resolved by servicing the pump transformers, and wrong temperature settings also...