PentairMar 1, 2015. #1. We have a 2 1/2 year old SR400NA we use to heat our SPA. Last night the SPA would only heat to 94 degrees as reported by out Pentair Water Easy Touch controller. The water was lukewarm at best. I tried shutting off the breakers to all the pool equipment to see if that woul reset everything, but that did not help.Amazon.com : Pentair 460737 MasterTemp High Performance Eco-Friendly Pool Heater, Propane Gas, 400,000 BTU : Swimming Pool Heaters : Patio, Lawn & GardenThe Pentair pool heater error code E01 indicates that your temperature sensor is open. There can be many reasons for a Pentair pool heater to display errorPentair ETi 400 Quick Reference Manual (4 pages) HIGH EFFICIENCY HEATER. Brand: Pentair | Category: Heater | Size: 1.22 MB. Pentair ETi 400 Pdf User Manuals. View online or download Pentair ETi 400 Installation Manual.Whether you are troubleshooting your heater for one specific problem, or simply looking to tune up your Pentair® MasterTemp® or Max-E-Therm®, this repair kit has what you need! This Kit Includes: (1) Stack Flue Sensor Replacement 42002-0024S. (1) Thermistor Replacement 42001-0053S. (1) Pressure Switch Replacement 3902.Pool heater displays an r14 code then shuts its self off. We replaced the touch screen membrane. It still shows an - Answered by a verified Pool and Spa Expert. ... I bought my house this past summer and has a pool equipped with a Pentair heater Mastertemp 400 p/n 460736. Recently the heater is turning on by itself and shows code 328 on the ...If the heater burners are lit for the 4 minutes you say the heater is running, you should replace the thermal governor and internal bypass valve assembly, as this may be failing and allowing hot water to recirculate through the burners; the AGS switch shuts off the heater when it senses water temp above 140° on the second pass through the heat ...All Max-E-Therm heaters are designed with a direct ignition device, HSI (hot-surface ignition), which eliminates the need for a standing pilot. The Max-E-Therm requires an external power source (230-240 VAC, 50 Hz) to operate. SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference.See previous page for STEP 1 - See Table 6 (page 15), to determine allowable vent sizes for the MasterTemp 125 heater. 2. Install the metal Flue Collar in the Vent Body of the heater (located under the outside vent cover). Fasten the metal Flue Collar to the Vent Body with two #10 sheet metal screws.If you own an AO Smith water heater, it’s important to know its age. Understanding the age of your water heater can help you make informed decisions about maintenance and repairs. ...Mar 1, 2015. #1. We have a 2 1/2 year old SR400NA we use to heat our SPA. Last night the SPA would only heat to 94 degrees as reported by out Pentair Water Easy Touch controller. The water was lukewarm at best. I tried shutting off the breakers to all the pool equipment to see if that woul reset everything, but that did not help.Make sure the pump is on and that the cords are plugged in securely. ER 2: This code means there’s a problem with the heater’s flow switch. Check to make sure that the flow switch is in the correct position and that there is no sand or other debris blocking it. ER 3: This code means that the heater has overheated.Jan 20, 2022 ... In this video I will show you what steps I went through to troubleshoot the no heating issue with my Pentair MasterTemp 250 pool heater.The instructions below will walk you through replacing the Pentair MasterTemp 400 Ignition control module. Step 1: Take off the left side panel of the heater. Step 2: Disconnect the system from the Max-E-Therm heater. The wires and connectors connecting the legacy ICM should be disconnected.We would like to show you a description here but the site won't allow us.Going Through The Startup Procedure Of A Master Temp HeaterI am getting a AGS code on my Jandy LT400P-L Heater. Can you help? - Answered by a verified Pool and Spa Expert ... (Lxi400 vintage 2007): service code AGS ... confirmed adequate fuel, ... Repair Tech and Certified warranty center for Pentair and Jandy pool equipment. Billy. Technician. 391 satisfied customers.Pentair476072 - ETi 400 Natural Gas to Propane Conversion Kit - The ETi 400 heater is factory-configured for use with Natural Gas.For applications using Propane Gas, this conversion kit is required. 475612 - ETi 400 Condensate Neutralizer Replacement Kit - ETi 400 heater produces condensate while in operation.The pH level of the condensate is between 3.1 …CODES FOR GAS-BURNING APPLIANCES AND EQUIPMENT and/or local codes and Standard CSA C22.1 – Canadian Electrical Code, Part 1 (Canada). The heater, when installed, must be electrically grounded and bonded in accordance with local codes, or, in absence of local codes, with the Canadian Electrical Code or the National Electrical Code, ANSI/Full-text digital display combines new functions and a user-friendly menu for easy operation and diagnostics. Digital connectivity with your pool's automation system and an advanced ignition control module with flame strength sensor help to ensure optimal heater performance. Alerts pushed to a smart device to keep you updated on heater ...Sep 19, 2019 · This is my third one of these heaters and they do a great job. The first two lasted about 10 years each, which is much longer than my first conventional pool heater that only lasted half that long.Up/Down button: Set speed of the pump from 15 to 130 GPM. The default flow rate is 30 GPM. The preset speed for each button is: Speed 1 button 1100 RPM (30 GPM), Speed 2 button 1500 RPM, Speed 3 button 2350 RPM, and Speed 4 button 3110 RPM. Right button (GPM/PSI): Move to PSI (pounds per square inch) pressure setting.We would like to show you a description here but the site won't allow us.Wholesale Sensors Replacement for Pentair 42002-0025S 140F Automatic Gas Shutoff (AGS) Switch for Pool and Spa Heater 18 Month Warranty. ... Replacement for Pentair MiniMax Heaters . This replacement 42001-0063s limit switch is designed to detect when the water temperature exceeds safer limits, this switch is an important piece in any Max-E ...This heater is design certified by CSA International as complying with the Standard for Gas Fired Pool Heaters, ANSI Z21.56/CSA 4.7, and is intended for use in heating fresh water swimming pools or spas. The heater is designed for the heating of chlorine, bromine or salt system swimming pools and spas.Optional Smart Heater Bypass valve control diverts water flow when the heater isn't needed to help save up to 35% in yearly operational costs.* Available only in store from Pentair dealers or retail stores; Find out where to purchase online or in a retail location near you. Where to Buy.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...The ETi 400 High Efficiency Heater features the TitanTough Direct-Fire Titanium Heat Exchanger, the longest-lasting heat exchanger ever built. And it delivers 96% thermal efficiency, the highest of any pool heater. The ETi 400 heater provides excellent flexibility for installation, with fully sealed Category IV direct air venting that does not ...Thinking to buy the Best Indoor Propane Heaters 2024? This video will inform exactly which are the Best Indoor Propane Heaters on the market today.1.My Pentair MasterTemp 250 heater melted down and I'm trying to find out why. My maintenance company fixed a leak in - Answered by a verified Pool and Spa Expert ... Typically this is caused by safety switch failure such as the AGS switch ( Automatic Gas Shutoff ), and a HLS ( High Limit Switch). ... We have a pentagram 400 the problem is it ...My Pentair mastertemp 400 heater was shutting down after 10 secounds or so, I was told to replace AGS, HLS, thermal - Answered by a verified Pool and Spa Expert ... I was told to replace AGS , HLS , thermal regulator , heater Thermister. Heater now turns off when heater gets to desired temp (102) ... my pentair 400 mastertemp is not heating the ...Digital connectivity with your pool's automation system and an advanced ignition control module with flame strength sensor help to ensure optimal heater performance. Alerts pushed to a smart device to keep you updated on heater performance and real-time status. Optional Smart Heater Bypass valve control diverts water flow when the heater isn't ...Item No. 604295 | Manufacturer SKU: 77707-0001. $77.99. Replacement Manifold Bypass Valve Kit for Pentair MasterTemp Pool Heater. More Details. How to get it. Ship to Home.View online or download Pentair pool products MasterTemp 460737 Operations & Installation Manual, Installation And User Manual. ... Conformité Aux Codes. 62. Information Et Recommandations À L'intention du Consommateur. 62. Section 3. Installation ... POOL AND SPA HEATER 120/240 VAC NATURAL GAS/LP GAS. Brand: ...MINIMAX® NT TSI HEATER, W/ DDTC CONTROLLER Item Part No. Mod. Description Qty MINIMAX® NT TSI , w/ DDTC 1 472352 Exhaust grill w/ gasket 1 1 2 471701 Gasket, exhaust grill 1 1 3 472353 200 Top cover w/ posts 1 3 472354 250 Top cover w/ posts 1 3 472355 300 Top cover w/ posts 1 3 472356 400 Top cover w/ posts 1 4 472357 200Exhaust assembly 1Pool Supply Unlimited has some of the best prices when shopping for Pentair MasterTemp & Sta-Rite Max-E-Therm Air Gas Shutoff (AGS) Switch | 42002-0025SAug 10, 2022 · what part of the Pentair MasterTemp 400,000BTU heater governs the shutdown of the heater if you have a momentary drop in gas pressure to the heater. We have changed the igniters, gas valve and control … read moreAt Pentair, we make products that move water, filter and soften water, and help you enjoy water. Whether you're looking for a Pentair pool equipment dealer near you, a home water treatment professional, or a new well pump to supply your home, our network of local dealers is here to help. Choose a category below to find a local Pentair dealer in ...WARNING - GAS HEATER: The IntelliTouch® automation control system is designed to supply high voltage (120 VAC / 240 VAC) to a gas heater and override the thermostat in the heater's control circuit. This automation control system is intended to control gas heaters with a high temperature limit switch(s) safety circuit ONLY. FailureA 9/2016 ETi 400 High Efficiency Pool and Spa Heater Installation and User’s Guide... Page 24 1/4 in x 2-1/4 in 3-1/2 in thick (min) SS concrete screw concrete pad and SS fender washer Figure 17. Figure 18. ETi 400 High Efficiency Pool and Spa Heater Installation and User’s Guide Rev.Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes. If an external electrical source is utilized, the heater, when installed, must be electrically grounded and bonded in ... from the rating plate inside the heater. Pentair Pool Products' high standards of excellence include a policy of continuous product ...Sep 12, 2022. #4. The AGS trips (opens) when the internal water temperature exiting the heat exchanger is 140 or more. It is a backup to the high-limit switch which is set to open at 135. This is usually caused by too low a flow rate. Possibly a bad internal bypass or thermal regulator, but not likely in a new heater.The pentair mastertemp 400 service heater light on is a reliable and efficient heating solution for your pool or spa. With its advanced technology and user-friendly features, it ensures optimum performance and hassle-free maintenance. Keep your pool at the perfect temperature with this top-quality heater.That’s why we made the ETi 400 high-efficiency Heater's direct-fire heat exchanger from titanium. It provides long life under extreme conditions. With the ETi 400 and ETi 250 high efficiency heaters, say goodbye to those icy pool shivers and hello to cozy temperatures year round.1. Milford, CT. Aug 15, 2017. #11. I can see this thread is old, but non-the-less, it gave me some insight into my recent E05 sighting on my Mastertemp 400 heater. Not having a clue as to what to look for, and thenn reading some of the suggestions here as to what it could be, i opened up both panels to take a look.How to find “ hidden” error codes on a Pentair Mastertemp. Mopar4Life. 3.42K subscribers. Subscribed. 161. 24K views 3 years ago. Pentair pool heater …Sep 10, 2023 · The pentair mastertemp 400 service heater light on is a reliable and efficient heating solution for your pool or spa. With its advanced technology and user-friendly features, it ensures optimum performance and hassle-free maintenance. Keep your pool at the perfect temperature with this top-quality heater.May 19, 2022 ... 1:35. Go to channel · Fixing AGS error on a Pentair MasterTemp 400 Heater. Oceanside Pools•1.7K views · 9:33. Go to channel · How to Safely&nb...Heater should NO fire. YES Resistance Table T (˚C) - Rn (Ohm) * 0 27396 5 22140 10 17999 15 14716 20 12099 25 10000 30 8308 35 6936 40 5819 45 4904 50 4151 55 3529 60 3012 65 2582 70 2221 75 1918 80 1663 85 1446 90 1262 95 1105 100 970 Note: (*) +/- 3% Replace Heater Control Board. DONE Reset power to Heater and retry. Heater should fire.1 42002-0035Z Heater Display Cover 2 42001-0030S Igniter Bracket 3 77707-0054 Igniter/Igniter Gasket Kit, Incl. Item Nos. 3 and 4) 4 42001-0066S Igniter Gasket 5 42002-0025S Automatic Gas Shutoff Switch (AGS) 6 42001-0063S High Limit Switch 7 42001-0053S Thermistor 8 42001-0056S Terminal Board 9 32850-0099 Fireman’s Switch Fuse (1.25A, 1-1/4 in.)Hi Nicole. Generally, the Pentair heater stops heating due to one or more reasons like Bad or damaged temperature sensors, the incorrect temperature setting of the thermostat, and bad internal bypass, blocked filter or pump basket, ignition malfunctions from the pilot lit, undersized pool heater, or severe defects on the heater elements.View online or download Pentair pool products MasterTemp 400HD Operation And Installation Manual, Operation & Installation Manual ... (AGS, AFS, HLS, PS Thermistor) 40. Burner / Heat Exchanger Troubleshooting. 42. Burner Troubleshooting. 42. ... Pool & Spa Heater (Indoor & Outdoor use) 240 VAC NATURAL GAS/LP GAS. Brand: ...This Pentair 42002-0025S 140F automatic gas shutoff switch is designed to use with Pentair MasterTemp pool and spa heater electrical systems. Also fits the Pentair Sta-Rite Max-E-Therm pool and spa heater electrical systems model SR200, SR333, SR400. Pentair makes the most of life's essential resources, from great-tasting water straight from ...• the automatic gas shutoff (AGS) switch, which opens if the heat exchanger outlet temperature goes above 140° F (60° C). • the stack flue sensor (SFS), which shuts down …The perfect Pentair Mastertemp parts list is designed to fix most problems within the Pentair Pool Heater. This Pentair Mastertemp 400 parts bundle is designed for the pool professional or the homeowner. Compatibility: This pressure switch is compatible with all BTU's of the Pentair Mastertemp heater parts and Mastertemp 400 parts.In today’s digital age, coding skills are in high demand. Whether you’re a beginner looking to kickstart your career or an experienced professional wanting to upskill, coding train...Get more enjoyment from your pool or spa. Add to your comfort and extend your swimming season with one of our energy-efficient and reliable heaters. All our heaters deliver fast heat-up times, low operating costs, and long life. Rugged housings are built to withstand the elements, and compact, attractive designs blend into any environment.The Pentair pool heater error code E01 indicates that your temperature sensor is open. There can be many reasons for a Pentair pool heater to display errorThese are the following: Examine the flow rate of the water to see if it exceeds the minimum. Adjust the water flow rate. Make sure the water isn’t over 60 degrees Celsius. It’s time to replace the high-limit switch. If this does not cure the problem, you will have to hire a professional to service your heater.Feb 22, 2023 ... How to find “ hidden” error codes on a Pentair Mastertemp. ... Pentair Mastertemp 250 pool heater “Not heating” problem solved(Bad AGS sensor) ...I have a pentair mastertemp 125 showing err afs, its one year old, i havent even used it this year i have a 2 year - Answered by a verified Pool and Spa Expert ... Hi, josh, its showing an err afs code it is under warranty still, i had it installed last june by a plumbing company. ... Replaced gas sensor heater still shutting off and giving ags ...This replacement 42001-0063s limit switch is designed to detect when the water temperature exceeds safer limits, this switch is an important piece in any Max-E-Therm or MasterTemp pool heater; Compatibility . Replacement high limit fit for Pentair Sta-Rite MasterTemp (All Models) & Max-E-Therm Pool Heaters - Models SR200, SR333, SR400; Directly ...I have pentair mastertemp 400 pool/spa heater. Started with an E01 code. Replaced the thermistor. Still got E01 code. Replaced the control board. Then got AFS light on control board . Blower is not ac … read moreControl Board: American Engineering Heavy Duty Hardware, Compatible With: Mastertemp and Starite Heaters. Air Flow Switch: Designed to work with Pentair Mastertemp 400 parts, 300, 200, and Pentair Mastertemp 125 low nox pool heater parts. It will also work with all Sta-Rite Heaters. Membrane Pad: Manufactured with a 100% gold dome to ensure the buttons can be pressed up to 1 million times.To reset the heater, cycle power. The temperature of the. stack flue is more than 480°F. Try using a small piece if wire to jumper the two eires together. I would replace the sensor. Funmit###-##-#### Stack Flue Sensor Replacement for Pentair Sta-Rite MasterTemp Max-E-Therm Pool and Spa Heater Electrical System SR200 SR333 SR400 https://a.co/d ...I am getting a AGS code on my Jandy LT400P-L Heater. Can you help? - Answered by a verified Pool and Spa Expert ... (Lxi400 vintage 2007): service code AGS ... confirmed adequate fuel, ... Repair Tech and Certified warranty center for Pentair and Jandy pool equipment. Billy. Technician. 391 satisfied customers.This is my third one of these heaters and they do a great job. The first two lasted about 10 years each, which is much longer than my first conventional pool heater that only lasted half that long.Pentair Mastertemp® 125 Heater Replacement Parts. $7.49 Standard Shipping on all orders. Checkout View Cart (0) View Saved Items (0) Toggle navigation. Part Schematics ... E-5 Automatic Gas Shutoff Switch AGS Item Number: 474368Z. Details: Pentair Pool Products Part Number 474368Z Used On Pentair Mastertemp 125 Heaters. View More …View and Download Pentair Pool Products MASTERTEMP 250K BTU/HR installation and user manual online. POOL AND SPA HEATER 120/240 VAC NATURAL GAS/LP GAS. ... Pool Heater Wiring Connection Diagram AGS Switch Stack Flue Sensor Gas Valve External Control Interface Circuit Disabled, Heater Membrane Pad Enabled External …My Pentair MasterTemp 250 heater melted down and I'm trying to find out why. My maintenance company fixed a leak in - Answered by a verified Pool and Spa Expert ... Typically this is caused by safety switch failure such as the AGS switch ( Automatic Gas Shutoff ), and a HLS ( High Limit Switch). ... We have a pentagram 400 the problem is it ...if you have any questions please contact us through our website at: https://www.poolspecialists.com/#paidlink1620 HAWKINS AVE., SANFORD, NC 27330 • (919) 566-8000 10951 WEST LOS ANGELES AVE., MOORPARK, CA 93021 • (805) 553-5000 ALL INDICATED PENTAIR TRADEMARKS AND LOGOS ARE PROPERTY OF PENTAIR INC. OR ITS GLOBAL AFFILIATES IN THE U.S.A. AND/OR OTHER COUNTRIES. THIRD PARTY …I have a Jandy RS pool controller and a Pentair MasterTemp 400 NG heater. All is working but not full potential. The Jandy control panel has an option, 1 button for pool heat, 1 button for spa heat.Pentair ETi 400 Installation And User Manual (64 pages) High efficiency heater. Diagnostics Leds: Ps, Hls, Tf, Ign, Afs, Ag1, Ag2, Fs Operator Control Panel Displays Rnc Code. Manual is suitable for 1 more product: ETi 400 NA. Brand: Pentair | Category: Swimming Pool Heater | Size: 12.09 MB.3 475985 AGS 150 degree F 4 475987 Air Pressure Switch 5 475996 Wire Harness 6 475998 Thermal Fuse 7 475601 Stack Flue Sensor 8 475989 Spark Electrodes ... The …Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 175,000 BTU - 460792. Call (888) 836-6025 or contact us for pricing and to purchase. Ultra-High Performance in a Compact, Quiet & Eco-Friendly Design .• the automatic gas shutoff (AGS) switch, which opens if the heat exchanger outlet temperature goes above 140° F (60° C). • the stack flue sensor (SFS), which shuts down …Heaters. Lights - Pool & Spa. Liners. Maintenance Items. Motors - Replacement. Paint - Pool & Deck. Plumbing. Pumps. Safety Covers. Safety Equipment. Salt Cell Replacements. Salt Chlorinators. Slides. ... Pentair MasterTemp & Sta-Rite Max-E-Therm Manifold Bypass Valve Kit | 77707-0001 $ 55.98. QuantityWARNING - GAS HEATER: The IntelliTouch® automation control system is designed to supply high voltage (120 VAC / 240 VAC) to a gas heater and override the thermostat in the heater's control circuit. This automation control system is intended to control gas heaters with a high temperature limit switch(s) safety circuit ONLY. FailureIn today’s digital age, coding has become an essential skill for anyone looking to thrive in the tech industry. Whether you’re a professional developer or someone who simply wants ...All Max-E-Therm heaters are designed with a direct ignition device, HSI (hot-surface ignition), which eliminates the need for a standing pilot. The Max-E-Therm requires an external power source (230-240 VAC, 50 Hz) to operate. SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference.To open the heater: 1. Remove left side panel from the heater (Fig. 1 and Fig. 2). Remove the four (4) wing nuts holding the top in place. FIG. 1. MasterTempSTD Heater MasterTemp 125 Heater FIG. 2. CAUTION!: Before unplugging ICM connector plugs, be sure to match the wire identification on both the existing and replacement wire harnesses. CAUTION!Turn off the heater and the gas supply. Wait for a minute, and then turn them back on again. Start the heater and pay attention to whether the service heater light is still on. By following these troubleshooting steps, you'll be able to identify and fix most of the problems with your pentair mastertemp 400 heater.Pentair MASTERTEMP 300 HD Pdf User Manuals. View online or download Pentair MASTERTEMP 300 HD Installation And User Manual ... POOL AND SPA HEATER (FOR OUTDOOR USE ONLY) Brand: Pentair | Category: Heater ... IGN Is on ALARMS: AGS, AFS, HLS, PS, E01 or 126 / SFS. 51. Burner / Heat Exchanger Troubleshooting. 54. Section 4. MaintenanceETI 250 HIGH EFFICIENCY POOL AND SPA HEATER. 461112 ETi250High-EfficiencyPoolHeater Natural 250,000 25L x 25W x 32H 270 120 or 240/60Hz/1Ph 15 AMP. CONVERSION, REPLACEMENT AND AIR INTAKE KITS. 462057 ETi 250 High-Altitude Conversion Kit for 4,500 ft - 10,000 ft. Natural 12L x 7W x 5H 2.We would like to show you a description here but the site won't allow us.Pentair EC462025 MasterTemp 125 125,000 BTU Compact Energy Efficient Swimming Pool and Spa Natural Gas Heater for Small Pools Up to 15,000 Gallons Visit the Pentair Store 3.3 3.3 out of 5 stars 38 ratingsYour Pentair MasterTemp 400 wrong temperature being displayed can be caused by a faulty thermistor, wet heater parts, broken thermal regulator, bad manifold bypass, and malfunctioning control board. Read our article to troubleshoot your Pentair MasterTemp 400. Pentair MasterTemp 400 Wrong Temperature [5 Easy Fixes] We will now take an in-depth look at the causesThe JXi is a copy of the mastertemp. I slightly favor the JXi because I like Jandy electronics a bit more and the versaflo is awesome. Selfishly, the JXi is also easier to work on with how the access panels and such are set up. Also, the mastertemp only has a 2 year warranty through Pentair and the JXi only has a 1 year full warranty, the 5 ...AGS – Automatic Gas Shut-off Switch max = 140 degrees HLS – High Limit Sensor max = 135 degrees SFS – Stack Flue Sen, Parts4Heating is your one-stop-shop for Pentair ETi 400 Pool Heater P, Pentair Pool Heater Parts. Sort By: 69 results. Sort By: 69 results. Pen, Quick video showing the Optimum Pool Technologies replacement sensors kit for the Pentair Mastert, 3 475985 AGS 150 degree F 4 475987 Air Pressure Switch 5 475996 Wire, The Pentair 475985 - Kit, Eti400 Ags 150F Replacement - Manufacturer Original Part. Cart. Your Cart is Em, Pentair MasterTemp 125 Low NOx Pool Heater - Electronic Ignition - Natural Gas with, Available Parts: 1. Part # 6290-230 Mfg # 42001-0051S. Combinat, Feb 4, 2020 ... SUPPORT ▻ Buy me a coffee: https://ww, Pentair Water Pool and Spa, Inc. 1620 Hawkins Ave., Sa, If you own a pentair pool heater, you may have experienced the a, I should have added to “Exact same symptoms on my Minimax 400, To reset the pentair mastertemp 400, follow these steps: Turn , This item: Wholesale Sensors Replacement for Pentair , Pentair MasterTemp Low NOx Pool Heater - 125k BTU (Propane) $ 1,959., Pentair Mastertemp 400 Troubleshooting Manual. Pentair’s Masterte, I have a sta rite maxi therm 333. Heater kicks on for 20 se, Pentair EC462025 MasterTemp 125 125,000 BTU Compact Energy Effi.