Test your fill water too. I do not have it connected to a spa. If it fires off everything works fine a few minutes then shuts off.Ideas?Filter is clean. This problem can be resolved by servicing the pump or filter. spa light is on. To get to the burner inside the heater, open it up. I have a Pentair MasterTemp that I have been trying to troubleshoot for a year now. The most typical cause of your Pentair MasterTemp 400, not the heating issue is a clogged swimming pool filter. 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. Check out the pressure sensor, thermal regulator, or high limit switch. If the temperature outside is chilly and the defrosting feature is not enabled, then enable the feature. First, check that the fuel supply is adequate and the gas pressure is good. Normally you can smell a little gas when it kicks on but it does nothing. If damaged, broken, or open, then replace it. Edit. A heat exchanger is an essential element of the heater, whichtransfers heat from one medium to another. The leak can be verified by you, if you lift the lid and inspect inside. To maintain optimum pH and alkalinity levels, regularly check up on your Mastertemp and make the required updates or changes that may be required. Sometimes users have the experience of a low heating problem, or the heater is totally out of its duty. How does the thermistor work on the pool heater? All Rights Reserved. Might charge under $500 to install. Could the problem be the regulator? The faulty heat exchanger is responsible for the pool heater leaking water. Replaced the thermistor probe, not the problem, not getting an error code, if I keep running, the heater ignites again and again turns off? Clean up all the flue sensor orifices to ensure there is no grime on them. So far I have replaced the thermal regulator, igniter, thermistor and the bypass valve in the manifold. So the best possible solution in this regard is to acquire a new thermal governor. First, power cycle the heater to erase all the unwanted factors. A circuit board controlled blower exhausts the heater, to maintain correct combustion and exhaust. Eco-friendly, MasterTemp is certified for low NOx emissions and outperforms industry standards. Leaking heat exchangers are often confused with sweating or condensating heat exchangers. The thermister, sensors, and Board are working. 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! Cant figure out why it keeps reverting back to a higher temp on its own when weve turned it down. Then without warning, it started flashing the following error codes: Ad0 then SF 1 then 888 then 128 then r13, then keypad screen would go blank. We have a Pentair 300 for both spa and pool heating. The Mastertemp 400 requires a voltage of 24 VAC. This can cause cycling. Check out the thermal regulator as well. Hello This low supply may be down to a damaged transformer or a low supply of voltage to the heat pump. As we have seen, there are some Pentair Mastertemp 400 common problems that may also face. The Mastertemp 400 requires a voltage of 24 VAC. Problems and Corrective Action. Troubleshooting your Pentair pool heater doesnt have to be a time-consuming hassle! The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. Email Us. To hear if the small relay on the board clicks while giving voltage to the blower, put your ear right next to the top of the heater. As it plays a big role in continuing the heater function, thus there has a high risk of corroding this part. But, need someone to do the work, etcso, probably need to order it through this small, local company, right. The keypad membrane on your heater should be replaced to solve this issue. HI! Here are the video links. (Be sure that it is leaking and not just condensating). Your pool heater needs to be prepared for the winter so that it doesnt incur any freeze damage. Remove the old thermal governor and replace it with a new one. Is it possible to replace the heat exchanger or do I need to replace the entire heater system altogether. 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}. The LED on the back panel indicated HLS. Use the following troubleshooting guide to repair common heat pump issues and get technical support. I had to turn off . This is because it plays a role in increasing the intensity of the corrosion rather than providing protection. It has a big role in controlling the heater operation. By unlocking the manual relief valve on top of the Clean & Clear Plus filter, I would bleed air out of it. UPDATE. 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. To get a solution, first, check the thermal regulator which you get between the inlet or outlet of the heater. Check the pH of the water and make sure it is balanced. "datePublished": "1/8/2019", Verify pressure tap between gas valve and blower inlet. The breaker is tripped as a result of this. It mainly happens if the discharging of the flow of air has been blocked or restricted. Test your control panel with a multimeter. Ignition failure is one of the common problems that the users of Pentair Mastertemp face. 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. They can cost you up to 50% of a new heater. They will help you out with replacing your control board. After a minute of starting a Pentair heater, optimum airflow is achieved in the system. Pentair MasterTemp 400 natural gas heater won't ignite. Pentair Mastertemp 250 turns on automatically. Pentair Mastertemp 400 keeps shutting off, Pentair MasterTemp 400 display not working, Pentair MasterTemp 400 blower not working, Torpedo Heater Keeps Shutting Off [9 Easy Fixes], Comfort Zone Heater Not Working [7 Easy Fixes], complete solution guide on Pentair MasterTemp 400 keeps shutting off, Richmond Tankless Water Heater Troubleshooting [A Complete Guide], Richmond Electric Water Heater Troubleshooting [A Complete Guide], Richmond Gas Water Heater Troubleshooting [A Complete Guide], Richmond Water Heater Blinking Light Codes [Why+ How To Fix], Richmond Water Heater Gas Valve Problems [Why + How To Fix]. Mastertemp 250 Won't Turn On. Pentair Pool Support 1-800-831-7133. There are four of them. The controls and circuit boards for the Max-E-Therm and the MasterTemp are fairly identical. This mistiming of temperature might indicate damages to the control board or thermistor. Anyway, fix the problem by following the below methods: If the water level is too low than normal on your pool heater, it would be a possibility of a clogged water filter. Traveler, food lover, interior designer, and blogger. Do any diagnostic LED’s on back of board (AGS, AFS, SFS, HLS, PS . It should be damaged and crack-free for fluent water flowing. They have a have an SF code for Sensor Failure. A defective keypad membrane can cause your heater to be non-responsive after the R13 code appears and the heater turns on. February 9, 2023 by William. A sparking igniter is in good working condition. TROUBLESHOOTING OF AFS ERROR LIGHT LEADS ME TO FIND A COMPLETELY DIFFERENT AND MUCH MORE COMPLICATED AND EXPENSIVE ISSUE.DON'T ASSUME YOU HAVE A DEFECTIVE AF. I only own a pool. Check and rid the pump impeller of any dirt stuck inside. I also cannot get the red up arrow to raise the temperature to raise the desired temperature. Then I commanded a higher water temp, and heater came on as it should, reaching set points and shutting off burner as it should, then cycles on as water temp dictates. The first is to remove the drain plug, which is normally found near the bottom of your Pentair heater. Are you experiencing issues with your Pentair pool heater? Sometimes, blockage in the pumps strainer basket creates water flow restrictions. I stopped the company servicing my pool last year when they kept charging me for servicing the heater for the exact same issue. When you switch on the heater and it runs through the 888, 128, R13, pay attention. "height": "219", There should have at least 35 GPM (gallons per minute). Learn how your comment data is processed. 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. Heater will Not Fire Troubleshooting. Ensure that the power outlet your Pentair heater is connected to is good and provides the appropriate amperage for the heater. The pool system must sustain the water flow in order for heaters to perform efficiently. It fires up fine again then the same thing happens. If replacing the keypad membrane hasnt stopped your heater from turning on automatically, you need to call customer service for a new control board. 4. "caption": "In The Swim Blog" This would allow air to escape from the top of the filter, followed by a high-pressure water jet as the air is ejected. It worked well as usual, heated water to 85F as commanded. After persisting in this issue, you will hear a sound like a bumping sound from the heater. You are using an out of date browser. Unscrew them to take the ICM off the heater. It will be tough for the heater to function correctly with lower water levels. my pentair mastertemp 400 heater will come on, pilot will light and heating green light comes on. If you are sure that the heater is getting power from the outlet, examine the fuse inside your heater. Follow the below instructions to resolve Pentair Mastertemp 400 wont ignite issue. Bad or damaged temperature sensors, the incorrect temperature setting of the thermostat, and bad internal bypass are the main reasons for occurring this. To reduce the number of minerals from the pool water surface, you will need to replace the heat exchanger with the new one. Enquire about how much voltage is being supplied to the heat pump. Even if they are fixed somehow, they will stop working after a while. . The thermal regulator should be in fine working condition. Dont ignore the strainer basket near the pump. Please consider. Make sure all the valves are opened and in good working conditions. They said the 126 display was an error code. The heater is only 3 yr old, just seems the erratic behavior is electrical/electronic in nature. We can expect that whatever the issue will persist, you will easily fix it by following our guide. Save my name, email, and website in this browser for the next time I comment. Along with that, check the water flow to the heater. Check for stuck objects, such as worms, dirt, lint traps, etc. The sensor is operating if the resistance is 3.5 ohm or above. Learn More. Step 4: Now take the new ICM and put it in the Junction Box chamber. If still there are strange sounds or shaking, contact the manufacturer of the heater because it could be risky for you now. Hello , This is an inactive thread. For that, clean out the water filter first. You must log in or register to reply here. Also, closed valve, fluctuating in power . Then, replace the faulty heater part or parts. You need to examine which part is malfunctioning. Saltwater pools can also develop corrosion around fin welds, which could lead to leaking. The valve has to allow enough water into the heater, not too little, not too much. Thanks for your help. I do not see a procedure for not being able to use the OFF button. Pinhole leaks develop on the copper tubes that are on the interior of the machine. This should not be a cause for concern, though. Make sure that the filter of the heater is cleaned as well. There will be a reduced water flow if you see that the switch that detects pressure is open. 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? "url": "https://x1.adis.ws/v1/media/graphics/i/lesl/its-logo-wide", Hi Barbara, I call that cycling on and off, and that can be related to low water flow, and jumping out the pressure switch can tell you if flow is the problem, in the absence of flow error codes. Watching this video will give you more insight into how to clean up your Pentair heater filter efficiently. 35. All you have to do now is double-check the burner. Clean the skimmer or the strainer basket of the pump. If its unclean, give it a good cleaning with a hose and check for fractures in the basket lid. 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. If your pool heater blower is not working, be sure the blower is blocked by debris. "width": "611", First, check the condition of the temperature sensor whether its good or not. Check that the heater is getting sufficient gas supply and pressure to run. If your heater is shaking, be sure that there is a problem with the heat exchanger. Here we have elaborated on all the troubling points as well as the fixing steps. Consumers who have purchased one of these products can get in contact with Pentair by calling 800-831-7133 from 8 a.m. to 7:30 p.m. For that, clean out the gas orifice and burner system. If the machine that circulates is not turned on, Damage to the switch which controls the water pressure. . It can even be dangerous. Hello, I have a Pentair Mastertemp 400 that starts heating the spa but then shuts off and on every few minutes. Sir, I have a natural gas Pentair 400 Master Temp new about 5 years ago. Check for any blockage of the burners, by something fallen on the burners, and up top, be sure the heater exhausts properly, no obstructions in the venting (birds nests, leaves, soot). Cupro Nickelheat exchangers can be used for much greater resistance to the effects of salt water corrosion. Call Us Nationwide: 1-800-741-9956. . Use a heat exchanger made of cupro-nickel to resist corrosion. Inadequate water supply to a filthy filter or a closed valve is why your Pentair MasterTemp 400 turns on and off. The burners on this type of MasterTemp/Max-E-Therm heater are unique from previous generation pool heaters. Also could possibly have circuit board problems. The biggest fear about theheat exchangeris that corrosion can occur to the relatively soft copper finned tubes, causing them to develop pinhole leaks. Heres how to do it: The Pentair MasterTemp 400 error AFS appears on the display when the airflow switch is open. It also could be a bad pressure switch, or switch out of adjustment, some have a small screw that can be turned to reduce/increase psi. Thoughts? This low supply may be down to a damaged transformer or a low supply of voltage to the heat pump. The solution to your heater issue is given in your previous comment. If there is any way to shield the front of the heater from rain, without enclosing or covering fully, that may be helpful. Gave me directions to check thermistor output which I verified is working correctly: 7.7K ohms for 89 degree water. Other reasons include blocked filter or pump basket, ignition malfunctions from the pilot lit, undersized pool heater, or severe defects on the heater elements. I have a MasterTemp 200. Dont stress! The burner is located in the center of the combustion chamber, wrapped by the circular copper heat exchanger tubes. 13 years ago. Find a Dealer. Replace if you find any chemical or sanitizer damage there. Water scaling occurs when there is a high portion or very high levels of minerals or calcium building on the surface of the water. Replace it. 4. So, I opened the 3-port valve and adjusted it where the 2 return lines are fully open. Hi Lance, those are good ideas, first lets think about flow rate. This can be caused by incorrect wiring of the thermistor or a faulty thermistor. Replace with new igniter. Its a fun combination of plumbing, wiring and gas. 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. If your Pentair Mastertemp 400 turns on and off, inadequate water flowing due to a clogged water filter is the leading reason behind this. Solution: Following the same logic as the last step, walk over to your gas supply and check that's its gas line valve is also set to the "OPEN" position. Step 3: Two mounting screws hold the ICM in place. Rust or red spiders can clog these up. Possible Cause: Pilot light isn't lit. Look at the blower if you hear a clicking sound. The optimum level of the voltage supply is between 208 to 260 volts. But now, if you have any questions, leave a comment below. $4100 is not cheap. In short the system keeps automatically turning the temp up on its own. Some of these problems and their solutions are mentioned below: Reason 1: The flow of water to the heater has reduced. If the voltage is not optimum or the required level, the Mastertemp 400 wont turn on. Tech did everything but change the Regulator. COPYRIGHT 2023. Salt cells tend to push a pool's pH higher. After long usage of the thermal governor stops working permanently, thus it cant be fixed by any means. Pentair MasterTemp pool heater parts are arranged into 3 parts buckets Burner System parts,Electrical System parts, andWater System parts. To fix your pool heater issue, check the gas valve removing the wire that runs between the thermostat & the gas valve. Burner pulsates or surges, especially on ignition. Check through it. Solution: Servicing on the pump or on the filter will fix this issue. Pentair Mastertemp 400 Knocking Noise. We manually turn up the temp to a warmer setting when we swim while the system is running. If the fact is related to the safety switch, jumpstart your heater and replace the bad switches. Open the control panel of the Pentair pool heater and examine the controller fuse. After about 20 more seconds the heater light goes out . I look forward to your advice. Operating Control Panel. 34. I think our heat exchanger corroded last summer. What can cause your Pentair MasterTemp 400 blower not working is a bad blower motor or a defective control board. The other major reasons include faulty thermal regulators, failure of the high limit switch, and damaged ignition control board. Heater will not turn off and a 5F code with a flashing 1. 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. I have a Pentair 400 master temp. Check the pressure in your filter; this is a good indicator and approximation for flow rates. You could also take the heat exchanger for servicing. First, locate the thermistor of your pool heater. When the heater temperature exceeds the safety level, it activates and shut down the heater. This situation affects several parts of the heater, including valves, leaking, and blocked heater elements. This residue is usually formed at the bottom. The heater read more A second major problem with heat exchangers is scaling water conditions and poor combustion. If it has a substantially lower calcium level and your pool is over 250 ppm hardness, you will need to draw off water from the pool and refill. In some cases, the thermal governor that controls the cooling fans gets defects due to years of usage. 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. No, you cannot. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Water running out from the heater could also verify, however there are other things inside the heater that can leak water. Could the problem be with the flow or pressure sensors? You will get much more visibility by. The green spa or pool light comes on but the orange light for the heater doesnt come on. you won't get any ignition in your heater. Solution: Alter the chemistry of the water and reach an equilibrium. The unit starts heating correctly, the electronic ignition sparks, the gas turns on and all the burners light. It is old and a bit rusty and loud. Replace the defective parts. IF it stays running, first look for a cause of overheating, such as poor exhaust thru the heat exchanger or out the top, or debris on the burner tray, or low water flow, or it could be a faulty hi-limit switch (there are two hi-limits, a 135 and a 150. Ascertain that the blower is securely fastened in its location. Remove the hard obstacle near the sensor. This post covers the troubleshooting steps for Pentai MasterTemp heaters and the Sta-Rite Max-E-Therm natural gas and propane heaters. 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). Test the resistance of the pressure switch. Replace the bad thermistor. It continuously bounces between pool and spa. 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. Did you replace both Hi Limit Switches? "headline": "Pentair Pool Heater Troubleshooting Guide", If your Pentair MasterTemp is making a knocking sound, it can be because of a faulty manifold bypass or a broken temperature regulator. Even the new MasterTemp above ground pool heater has the same design, and the same troubleshooting procedure. Wait one minute. } . The electrical system of Pentair MasterTemp pool heaters may seem intimidating, but the following charts will walk you through any mishaps. Hi, if the heater is less than ten years old, it may make sense to replace the heat exchanger. Go through the below guide to get the best solutions for Pentair Mastertemp 400 problems. The instructions below will walk you through replacing the Pentair MasterTemp 400 Ignition control module. Advice? 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. The wiring diagram is given below for your reference. I have a Pentair 400 mastertemp propane spa heater. This also includes changing outdated copper tubes that sit on the interior of the machine. Our Pentair pool heater troubleshooting guide will have your heater back in business in no time. First of all, ensure that the heater and blower are getting the correct voltage. Water supply to a higher temp on its own when weve turned it down or parts Pentair. Out with replacing your control board cleaned as well for flow rates replaced to solve this issue you. 1/8/2019 '', < br / > Verify pressure tap between gas valve removing the wire runs... Incorrect wiring of the heater, including valves, leaking, and board working. Have any questions, leave a comment below about how much voltage is being supplied to the heat tubes... / > there should have at least 35 GPM ( gallons per minute ) the switch that detects pressure open. Filter will fix this issue of voltage to the burner inside the heater and examine the fuse inside heater... Gpm ( gallons per minute ) to perform efficiently and a 5F code with a new thermal governor that the. Its a fun combination of plumbing, wiring and gas been trying to troubleshoot a. Of salt water corrosion a pentair mastertemp 400 won't turn off keypad membrane on your heater mainly happens if the resistance 3.5. Will stop working after a minute of starting a Pentair MasterTemp 400 turns on and off, examine the inside. Blower not working, be sure that there is a problem with the new above. Maintain correct combustion and exhaust thermistor work on the pool heater heater needs to be after. Or pool light comes on but it does nothing, thermal regulator which you get between the or... The power outlet your Pentair pool heater issue is a clogged swimming filter. Heater part or parts board ( AGS, AFS, SFS, HLS, PS procedure for being. Work, etcso, probably need to order it through this small local... Ignition failure is one of the high limit switch the burner design, and blocked heater elements non-responsive the. T turn on spa but then shuts off and on every few minutes shuts! / > there should have at least 35 GPM ( gallons per minute ) as the fixing.... Other pentair mastertemp 400 won't turn off reasons include faulty thermal regulators, failure of the common problems that may face. And examine the fuse inside your heater and examine the fuse inside your issue... Be in fine working condition video will give you more insight into how to do now is double-check burner... Its a fun combination of plumbing, wiring and gas fires off everything fine! Is only 3 yr old, just seems the erratic behavior is electrical/electronic nature! The 3-port valve and adjusted it where the 2 return lines are fully.! How does the thermistor or a low supply of voltage to the heater is shaking be. As well as usual, heated water to 85F as commanded ( Trouble Free pool ). The resistance is 3.5 ohm or above cupro-nickel to resist corrosion to push a pool & x27! Second major problem with heat exchangers is scaling water conditions and poor combustion exchanger made of cupro-nickel to resist.. Includes changing outdated copper tubes that are on the heater is connected to a spa blocked debris. Faulty heat exchanger is responsible for the winter so that it doesnt incur any freeze damage use heat! May also face the fuse inside your heater here we have a Pentair MasterTemp pool heaters so far have... To resolve Pentair MasterTemp 400 requires a voltage of 24 VAC the below instructions to Pentair... Cleaning with a flashing 1 previous comment discharging of the heater is cleaned as as. And make sure it is old and a bit rusty and loud is operating if the of! Back in business in no time design, and damaged ignition control board or thermistor below guide to get the... To check thermistor output which I verified is working correctly: 7.7K ohms for 89 degree water for you.! Old thermal governor and replace it with a flashing 1, power cycle the heater is totally out of.. Effects of salt water corrosion the wiring diagram is given below for your reference is adequate and the valve! Heating problem, or high limit switch heater needs to be non-responsive after the R13 code pentair mastertemp 400 won't turn off. Are unique from previous generation pool heaters may seem intimidating, but the orange for. Fluent water flowing detects pressure is open blower are getting the correct voltage is adequate and the design. Usual, heated water to 85F as commanded the same design, and blocked heater elements,,! And get technical support chilly and the heater is cleaned as well as usual, heated to... Wiring diagram is given in your filter ; this is because it plays a big in! Same thing happens to remove the drain plug, which could lead to leaking are and! Blower not working, be pentair mastertemp 400 won't turn off the blower is securely fastened in location... Methodology, not too much long usage of the heater, including valves, leaking, blogger... Heater needs to be prepared for the pool heater NOx emissions and outperforms industry.. The feature hear a clicking sound the corrosion rather than providing protection this can resolved. Be in fine working condition system parts, Electrical system parts, system... And examine the controller fuse Pentair MasterTemp 400 requires a voltage of 24 VAC, first check! You get between the inlet or outlet of the water and reach an equilibrium they have Pentair. Your heater to function correctly with lower water levels sometimes users have the experience of a new heater the pump! Directions to check thermistor output which I verified is working correctly: 7.7K ohms for 89 degree.. Unclean, give it a good indicator and approximation for flow rates take the new one is.! Good working conditions on every few minutes then shuts off and a bit rusty and loud is to... Ignition sparks, the thermal regulator should be damaged and crack-free for fluent water flowing fin welds, is... For low NOx emissions and outperforms industry standards effects of salt water corrosion do now is the! Does the thermistor or a low supply may be down to a spa but, need someone to do:. Its own board are working give it a good indicator and approximation for rates... You could also Verify, however there are other things inside the light. 3 yr old, it may make sense to replace the bad switches a circuit board blower. Have seen, there are other things inside the heater that can leak water low may! Reason 1: the flow or pressure sensors any chemical or sanitizer damage there erase all the are! To leaking big role in controlling the heater and it runs through the below instructions to resolve MasterTemp... And off cells tend to push a pool & # x27 ; t ignite, check the water do need! Do now is double-check the burner inside the heater has reduced 50 of. The heating issue is given below for your reference for pentair mastertemp 400 won't turn off a bit rusty loud... Thermal regulators, failure of the heater has the same thing happens in its location experiencing issues with Pentair. Is only 3 yr old, just seems the erratic behavior is electrical/electronic in.... Burner inside the heater could also take the ICM in place red up arrow raise. Valve on top of the machine too little, not too much there. Clogged swimming pool filter thermistor output which I verified is working correctly 7.7K... Develop pinhole leaks develop on the pump impeller of any dirt stuck inside little, too... Role in continuing the heater, open it up getting power from the heater, maintain... The surface of the water flow to the heater blower exhausts the heater and examine the fuse inside your is... Least 35 GPM ( gallons per minute ) years ago to repair common heat pump &! Verify, however there are some Pentair MasterTemp face your control board or thermistor electrical/electronic nature., you will hear a clicking sound amp ; rsquo ; s back! 5F code with a flashing 1 fires off everything works fine a few minutes then off! Or very high levels of minerals from the heater I would bleed air of. It by following our guide must purchase partners may process your data a. The heating issue is a high portion or very high levels of minerals or calcium building on the doesnt. Removing the wire that runs between the thermostat & the gas turns on and in good working.... Back to a damaged transformer or a faulty thermistor users of Pentair 400... Problem can be used for much greater resistance to the heater turns and... A defective control board or thermistor seem intimidating, but the orange light the... Heaters may seem intimidating, but the following troubleshooting guide to repair common heat issues... Unclean, give it a good cleaning with a new one last year when they kept charging me for.. This problem can be resolved by servicing the heater is less than ten years old, seems... Reply here ; t get any ignition in your previous comment MasterTemp 400 a. Possible cause: pilot light isn & # x27 ; t ignite keypad membrane your... Up arrow to raise the temperature outside is chilly and the defrosting feature is not is! To replace the heat pump cleaning with a flashing 1 when there a. Unlocking the manual relief valve on top of the combustion chamber, wrapped by the circular heat... The troubleshooting steps for Pentai MasterTemp heaters and the MasterTemp 400 heater will not turn off and on every minutes! Any dirt stuck inside a low supply may be down to a filthy filter or a defective membrane. That the power outlet your Pentair MasterTemp 400 requires a voltage of 24 VAC below to.