Lo on hayward pool heater

PitschPlumbing. Generally, LO refers to the pressure switch, water pressure. This can be caused by either the diaphram in the flow switch has failed or the filters is clogged and/or pump is unable to make enough pressure to make the switch. Open the front panel of the heater and look up in to the right. You will see a round part with 2 wires ...

Hayward H400FDP Pdf User Manuals. View online or download Hayward H400FDP Owner's Manual, Troubleshooting Manual ... POOL AND SPA/HOT TUB HEATERS. Brand: Hayward | Category: Heater ... LO" Code. 46. Pressure Switch Adjustment. 49. IF" Code. 52. AC" Code. 57. AO" Code. 58. Heat Exchanger: Flow Requirements. 61.My Hayward h400 pool/spa heater will not turn on any longer. It is getting power but the combustion blower which turns on first is not turning on. There is no gas smell and no igniter spark happening. …Pool Heat Pump (2) Refine by Product Type: Pool Heat Pump Heat Output 150,000 BTU (2) Refine by Heat Output: 150,000 BTURaypak RP2100 Digital Natural Gas Heater, 399,000 BTU, Cupro-Nickel Heat Exchanger - P-R406A-EN-X / Propane Version. Unsurprisingly, a Raypak tops our list of best pool heaters; they are the standard-bearer in pool heating. The RP2100 Series 406A, with a Cupronickel heater exchanger, features a simplified design unique to Raypak while packing ...You need to put the heater in STANDBY Mode to get the bO code on the heater display. Press the mode button once to get the heater in STANDBY Mode. First, press and hold on to the Down key. Then, press and hold down the MODE key as well. You need to keep holding both keys for about three seconds. At this point, the “bO” message should appear ...The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! Its ground-breaking hydraulic design reduces pump circulation run time, giving ... Shop our wide selection of Hayward Pool Heaters; Return Policy; Product Information. Internet # 311793698. Model # HPPW3H400FDN. Store SKU ...Fix: Have the owner get a filter replacement/cleaning. Another common water flow issue is an open heater bypass valve. A bypass valve is put in place near the intake to stop water from flowing through the heater when it's not in use. When in bypass, the heater's water flow switch (i.e., the pressure switch) should open, and the heater will not run.Details ADD TO CART. Hayward Universal H-Series Heater, Low NOx, 250,000 BTU, Natural Gas, Cupro-Nickel Heat Exchanger - W3H250FDN. Part # W3H250FDN. 4.83. $3179.00 IN STOCK. BTU 250,000 BTU Heat Exchanger Cupro-Nickel Type Low NOx Ignition Electronic Manufacturer Hayward Heater Type Natural Gas. Details ADD TO …

The Hayward H-Series' Finn Plate cupro-nickel heat exchanger has special V-groove design for faster heating and longer life. Hayward Universal H-Series, Low NOx, 400,000 BTU, Propane Gas, Pool and Spa Heater delivers energy efficient heating to your pool's water that you can trust. Hayward Universal H-Series - Versatility & PowerHayward W3HP50HA2: Heat pump: Electric: 50,000: In-ground: Raypak P-R266-A-EP-C: Gas heater: Propane: 266,000: ... Pool heaters keep your pool at a comfortable temperature at all times, no matter ...Program Heater Bypass & Temperature Lockout 9-11 8. "SF" or "HS" Code 41 ... Test/Adjust Gas Pressure 13-15 10. "HF" Code 43 Burner Inspection 16-19 11. "LO: Code 44-47 Change/Replace Combustion Chamber 20-26 12. "IF" Code 48-49 ... The default Max temp set points are 90ºF (Pool) 104ºF (Spa). When setting the max temp lock-out set point ...With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user donations. The Universal H-Series Low NOx heater has an 84 percent industry-leading thermal efficiency and complies with all current California air quality emission standards. The low NOx emission makes it a perfect choice for the environmentally concerned pool owner. Enjoy a warmer pool this season without your fuel costs skyrocketing. Go Green with a little help from the sun. AquaSolar GL-235™ is America's best-selling entry level microprocessor based solar pool heating control system designed for easy and dependable operation. Enjoy automatic maximization of solar heat collection and reliable, accurate performance. AquaSolar GL-235 also includes a nocturnal cooling option.Mar 26, 2015 · Also, is a heater that is not lo nox still safe to use. We are looking at the Raypak 156A Above Ground Pool and Spa Heater with Digital Controls Electronic Ignition in Natural Gas 150K BTU or the Pentair MasterTemp Low NOx Pool & Spa Heater – Dual Thermostat – Electronic Ignition – Natural Gas – 175,000 BTU .

The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! This unit is perfect for the environmentally conscious Pool and Spa owner thanks ... Shop our wide selection of Hayward Pool Heaters; Return Policy; Product Information. Internet # 311793696. Model # HPPW3H150FDP. Store ...Step 2. Turn off the Gas Supply. If you have a gas-powered Hayward Pool Heater, turn off the gas supply by closing the gas valve. This valve is usually located near the heater or on the gas line leading to the heater. Turn off the gas valve completely to prevent any gas from leaking. Step 3. Shut Off the Pool Pump. 1.3 Heater Cycling On And Off. 2 Troubleshooting Steps. 2.1 Check Gas Pressure And Fuel Supply. 2.2 Inspect Air Supply And Venting. 2.3 Ensure Proper Water Flow. 2.4 Clean Filters And Pump. 2.5 Adjust External Bypass If Needed. 3 Tips For Diagnosing Problems. 3.1 Follow The Heater Start Sequence. Buy a Hayward W3H250FDP Universal H-Series H250 Low NOx Pool Heater, 250,000 BTU, Propane Gas at The Pool Supplies Superstore. FREE Shipping. Guaranteed Lowest Price.Posted April 16, 2010. The "LO" code means "Loop Open", referring to your safety loop switches. Most likely it's your pressure switch that's open due to low water flow usually caused by a dirty filter. The "60" code is really "bO" meaning "bypass operation" in which your heater's internal thermostat is bypassed so as to control the set ...Dec 7, 2022 ... How to replace the keypad on a Hayward HD400 gas pool heater. ... Hayward heater LO error cheap repair. Let's ... Hayward Pool Heater Sb Error Code ...

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In this way, what does Lo mean on a Hayward heater? The Hayward heater LO code indicates a fault in the temperature limit switch, vent pressure switch, or water pressure switch.To fix it, ensure the pump is on, is wired and connected well, the water flow is above the required minimum pressure, the filters are clean.Hayward's Universal H-Series heaters represent innovative heating technology for pools and spas. Its hydraulic performance also saves energy by reducing the circulation time of the pump. It can raise the temperature of an 800 gallon pool 30 degrees in less than an hour you'll feel the benefits the moment you step into the water.Jul 4, 2019 ... How To - Create your own Hayward Pool Gas Heater Vent ... Falla LO de calentador de piscina HAYWARD serie FDP ... Cheap Fix for Pool Pump not ...What model number is ***** Hayward pool heater? Give me a secound. Contractor's Assistant: When did you first notice the 'LO' indicator light coming on? Day one. ... Replaced Hayward 400 with new H400FD pool heater. I'm getting a LO alarm before reaching 104 degrees. And a HS alarm. Local techs can't find the problem.

Hayward IDXL2PSA1930 Pressure Switch: This OEM replacement switch is designed to fit perfectly with Hayward pool heaters and has a high accuracy pressure sensing mechanism. Bousnic Pool Heat Pump Pressure Switch : This universal pressure switch is compatible with most pool heaters and has a high-quality build to withstand …Hayward Pool & Spa Heaters. 4 RESULTS. Hayward Universal H-Series Low NOx Induced Draft Residential Pool & Spa Heaters. Hayward Universal HC-Series Dual Fuel Technology Pool & Spa Heaters. Hayward H-Series Cupro-Nickel Heat Exchanger Above Ground Pool & Spa Heaters. Hayward Heater Tops & Vents for Indoor or Outdoor Use.While all Hayward H-Series heaters are energy-efficient, the Universal H-Series 200 Low NOx natural gas heater has an 83-84 percent leading thermal efficiency. Cart. ... Hayward Universal H Series Low NOx 200,000 BTU Natural Gas Swimming Pool Heater SKU: W3H200FDN. 4.8 See Reviews (4)The H-Series pool heater from Hayward reduces the circulation time of the pump and can raise the temperature of an 800 gallon pool by 30 degrees Fahrenheit in less than an hour. Sort By: Hayward Natural Gas Pool Heater 100K BTU H100ID1. Get the Hayward Natural Gas Pool Heater H100ID1 and other swimming pool heaters for less at Pool Express ...Hayward 250 pool heater throwing AO code. Replaced control board, blower motor, pressure switch, igniter. Still not turning on. … read more. Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! Its ground-breaking hydraulic design reduces pump circulation run time, giving you an energy savings of up to 18%! This unit is perfect for the environmentally conscious Pool and Spa owner thanks to its Low NOx capabilities. I have a Hayward pool heater (model #H250FDN). Over the past week, the heater fired up and heated just fine. All display functions seemed to operating normally (temperature read out was good, i was able to cycle the mode from standby, to spa, to pool, and back to standby). ... LO - Water Pressure Switch, Vent Pressure Switch, or Temperature ...* 500,000 BTU provides unprecedented speed to heat, with just 2 models delivering 1 million BTU'S while using minimal pump room space Specifications Active DefrostHow to fix it: Check that pool pump is receiving enough water. Ensure that your pool pump is sending water to the heat pump. For variable speed pool pumps, try putting the pump speed up a notch Check for any clogs or backups causing poor water circulation. The same is true if what you use is in your pool is the Raypak pool heater.Hayward W3H250FDP Universal H-Series, Low NOx, 250,000 BTU, Propane Gas, Pool and Spa Heater delivering durability, reliability, and energy efficiency. "Totally Managed" Flow saving energy by reducing pump run time. Silicon Nitride Ignition System. Cupro-Nickel Heat Exchanger ensures compatibility with almost all pool systems including salt pools.The Lo on a Hayward heater means “low.” When the Lo setting is selected, the heater runs at a lower speed, which can help conserve energy. In some cases, the Lo setting may indicate a malfunction or another issue with the heater. If you notice your Hayward heater displaying an LO code, it is important to check the manual or contact …

Hayward W3H135FDN H-Series 135K BTU Natural Gas Above Ground Pool and Spa Heater. Hayward H-Series heater for above ground pools and spas combines reliable technology with ease of operation and superior performance. H-Series heaters boast industry-leading hydraulic performance coupled with a 135,000 BTU rating for faster speed-to-heat capability.

The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! Its ground-breaking hydraulic design reduces pump circulation run time, giving you an energy savings of up to 18%! This unit is perfect for the environmentally conscious Pool and Spa owner thanks to its Low NOx capabilities.Other issues include high chlorine levels, high TDS and High SALT and high calcium. These conditions can also play havoc with heaters. Swimming pools that fail to follow basic water care will have problems with clogged and leaking heaters. Good water chemistry is essential to heater longevity. Questions call: Rich at 609-313-0300.Your pool heater needs enough water pressure to run properly, usually at least 40 GPM (gallons per minute). If your heater is not getting a steady stream of water, it could be due to a clogged filter or dirty pump basket. Turn off your heater and pump before cleaning. Clean the filter, skimmer, and pump baskets.Find helpful customer reviews and review ratings for Hayward W3H200FDP Universal H-Series 200,000 BTU Propane Pool and Spa Heater for In-Ground Pools and Spas at Amazon.com. Read honest and unbiased ... So I was basically muscle and tool getter. After going crazy with the LO code. I finally watched a video and it explained that the problem was ...We bought a new Hayward above ground pool heater H1001D and converted it to propane from natural gas with the appropriate conversion kit. When we turn the temperature guage on it clicks like it's work …Hayward 400K BTU Pool Heater Review. November 14, 2023 by sunny. Step into a world of poolside luxury and endless relaxation with the Hayward Universal H-Series 400,000 BTU Natural Gas Pool & Spa Heater. Dive into a review where reliability meets unparalleled performance, offering you the ultimate comfort for pools and spas up to 1,200 sq. ft.The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! Its ground-breaking hydraulic design reduces pump circulation run time, giving ... Shop our wide selection of Hayward Pool Heaters; Return Policy; Product Information. Internet # 311793695. Model # HPPW3H150FDN. Store SKU ...The Hayward heater LO code indicates a fault in the temperature limit switch, vent pressure switch, or water pressure switch. To fix it, ensure the pump is on, is wired and connected well, the water flow is above the required minimum pressure, the filters are clean.

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Hayward's pool heater saves money by being the most energy efficient solution for any pool/spa. It's designed for ultimate performance, comfort and durability while being environmentally responsible. For rapid comfort, we offer the Universal solution. Universal H-Series. H300FDP Universal H-Series Propane Gas 300,000 BTU Low NOx (Expert Line ...We have a commercial inground pool with a 250000 btu Hayward H Series Propane Heater for the spa and we just added a 140k Hayward Heat Pro Heat pump to pool. How can we plumb them together so both poo …Page 40 Heat Pump Pool / Spa Heater Owner's Manual Notes:... Page 41 Notes:... Page 42 1. Fill out the reverse side of this card. 2. Cut card along the edges and drop it in the mail to us. ALONG EDGES Hayward Pool Products 1 Hayward Industrial Drive Clemmons, NC 27012 ATTN: HEAT PUMP WARRANTY DEPT.LO on Hayward Hseries Pool heater. 2 years in October. H150 or 250. A week Backwash look for air leaks backwash. It - Answered by a verified Pool and Spa ExpertFix: Have the owner get a filter replacement/cleaning. Another common water flow issue is an open heater bypass valve. A bypass valve is put in place near the intake to stop water from flowing through the heater when it's not in use. When in bypass, the heater's water flow switch (i.e., the pressure switch) should open, and the heater will not run.Jul 25, 2017 · Available in 150,000, 200,000, 250, 000, and 400,000 BTUs, the Universal H-Series heater can raise the temperature of an 800-gallon pool 30 degrees in less than an hour—you’ll feel the benefits the moment you step into the water. The Hayward Universal H-Series Low NOx can be added to inground pool kits sold by Pool Warehouse! Best Pool Heaters: Comparison Table. Best Pool Heaters 2022: Reviews. BEST OVERALL: Hayward H400FDN Universal H-Series 400,000 BTU Pool and Spa Heater. BEST SOLAR HEATER FOR ABOVE GROUND POOLS: Intex 28685 Solar Heater Mat. BEST ABOVE GROUND POOL HEATER: Hayward HP50TA 50,000 BTU Heat Pro Heat Pump.If you're looking for help fixing your Hayward Pool Heaters, look no further! Our comprehensive Hayward Pool Heaters error code guide will explain common iss...Steps to Maintain Your Hayward Pool Heater. Step 1: Turn off the power supply and gas valve before performing any maintenance. Step 2: Remove any debris from the heater and surrounding area using a soft brush or vacuum. Step 3: Inspect the heat exchanger for any signs of corrosion or buildup. ….

The Hayward HeatPro Heat Pump uses a 100% titanium heat exchanger for corrosion-free operation and the cabinet features A UV-resistant, injection molded shell resists rust and deterioration. These features help the heatPro withstand intense weather conditions and pool chemicals.Hayward W3H150FDP Universal H-Series, Low NOx, 150,000 BTU, Propane, Pool and Spa Heater delivering durability, reliability, and energy efficiency. "Totally Managed" Flow saving energy by reducing pump run time. Silicon Nitride Ignition System. Cupro-Nickel Heat Exchanger ensures compatibility with almost all pool systems including salt pools.With over 300,000 members, TFP is the largest and most influential pool & spa website on the Internet. The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase. It is being practiced by thousands of pool owners just like you. We are a registered 501(c)3 non-profit that is funded by user …Jun 28, 2020 ... If you have an SF error code on your pool or spa Hayward heater I made a quick video how to fix it. I don't have an editing program so ...I have a new Hayward heater. I keep getting a lo code when the pool is turned off. This is a brand new heater and pool. My pool company that installed the pool told me to make sure I'm getting proper water flow in the system. But didn't tell me how to do this. Do I do it on the Hayward...Turn the thermostat all the way up on the heat pump. These units are not compatible with 3 wire remotes. For 2 wire air switch installations remove the jumper between terminals 1 & 2 and replace it with the 2 wires from your switch. Set the thermostat on the heat pump to the desired temp. Wiring Diagram HPABG / HP380.The Waldorf Astoria Los Cabos Pedregal is one of Mexico's best luxury hotels, right on the rugged coast of Baja California, with gourmet restaurants, an elegant spa and beautiful p...The Hayward heater LO code indicates a fault in the temperature limit switch, vent pressure switch, or water pressure switch. To fix it, ensure the pump is on, is wired and connected well, the water flow is above the required minimum pressure, the filters are clean. Replace defective switches. Lo on hayward pool heater, Hayward Natural Gas Pool Heater Uni H-Series 350K BTU H350FDN. The Universal H-Series Heater is the world-class heater with an Earth-friendly conscience. While all Hayward H-Series heaters are energy-efficient, the Universal H-Series Low NOx heater has an 83-84 percent industry-leading thermal efficiency and complies with all current California ..., Follow the included steps to place the heater in bypass mode for external control. Step 1. Press the ‘MENU ICON’ button to place the heater in ‘STANDBY’ mode. Step. The ‘SPA’ indicator should illuminate & the display should show the Max Temp set point. Step 2. Press and hold the minus & plus buttons for 3 seconds., Best Pool Heaters: Comparison Table. Best Pool Heaters 2022: Reviews. BEST OVERALL: Hayward H400FDN Universal H-Series 400,000 BTU Pool and Spa Heater. BEST SOLAR HEATER FOR ABOVE GROUND POOLS: Intex 28685 Solar Heater Mat. BEST ABOVE GROUND POOL HEATER: Hayward HP50TA 50,000 BTU Heat Pro Heat Pump., Here are a few tips to help you get your heater ready for the winter months: 1. Drain the water from your pool heater. This will help prevent any damage to the unit from freezing water. 2. Disconnect the power supply to your pool heater. This will prevent any accidental damage to the unit while you are working on it. 3., We then purchased the Hayward 100,000 btu and that worked well for us but was a bit underpowered for our size pool, that only did 1 degree per hour. Last fall we closed our pool too late and it froze and it leaked. So with much research we purchased the Hayward 250,000 btu propane heater. Electrician hooked it up on 220., The Universal H-Series Natural Gas Heater is a premium heating experience from HAYWARD, designed to help you relax and take a load off while in the pool or spa. Highlights Heater provides reliable, long-lasting comfort for in-ground pools and spas with a surface area of up to 600 ft. where natural gas is available, HI My Hayward Hseries pool heater shows a LO and stops working when it rains. My temp dropped from 92 to 80. Contractor's Assistant: Who manufactured the pool? I can't recall. It is a semi-inground purchased through Great Escape 5 years ago. Heater is 5 years old. I replaced the heating tubes last summer., Hayward Pool Heaters; Hayward Pool Heaters. Filter. Shopping Options. Pool Type. Above Ground Pools 2 items; Spa/Hot Tub 2 items; Thermal Units. 95K 1 item; 130K 2 items; 140K 1 item ..., Hayward salt systems are a popular choice for homeowners looking to maintain their swimming pool water in a clean and safe condition. These systems use salt to generate chlorine, e..., According to ANGI, electric pool heaters cost $1,000 to $6,000 to install on average; natural gas or propane pool heaters cost $1,500 to $6,000 to install; heat pump pool heaters cost $2,500 to ..., According to the H-Series pool heater owner's manual by Hayward, cleaning your heater filters is one of the most important steps you can take. That is to say, regularly cleaning these filters will lead to a longer lasting and better working pool heater. 1. Remove Filter Cover or Gain Access., How can you reset your Hayward Pool Heater? To reset your Hayward pool heater, first, select the ‘MODE’ button from the keypad. Then keep cycling between ‘STANDBY’ and ‘MODE’. Your heater will reset. Why does my Hayward Pool Heater keep shutting off? Your Hayward pool heater cycles on and off mainly due to overheating., Use the “Mode” key to change your heater’s settings. Select the “Standby” Option and put the heater on it. Press the remote’s “Down” key and hold it and then press the Mode key and hold it simultaneously. For 3 seconds, hold down both the “Down” and “Mode” keys as long as the “bo” code doesn’t remove from your ..., The hayward pool heater drain plug is located at the bottom of the heater unit. When removing the drain plug, ensure the heater is turned off, the gas supply is disconnected, and the water has cooled down to prevent any accidents. Introducing a well-rounded swimming pool maintenance involves several essential tasks, and one of them is draining ..., Hayward W3H135FDN H-Series 135K BTU Natural Gas Above Ground Pool and Spa Heater. Hayward H-Series heater for above ground pools and spas combines reliable technology with ease of operation and superior performance. H-Series heaters boast industry-leading hydraulic performance coupled with a 135,000 BTU rating for faster speed-to-heat capability., Shopping for Hayward Universal H-Series H500 Low Nox Pool Heater, 500,000 BTU, Propane Gas? Doheny's has it in stock now at the guaranteed lowest price. Enjoy FREE Expedited Shipping., The hayward pool heater h5 code can be caused by various issues, including low water flow, high limit switches, or a faulty pressure switch. To identify the causes, check the water flow, inspect the switches, and consult the heater's manual for troubleshooting steps., Hayward Manuals. Heater. H150FDN. Troubleshooting manual. Hayward H150FDN Troubleshooting Manual. Universal h series heaters. Also See for H150FDN: Service & …, 200K BTU. 250K BTU. 400K BTU. Select Gas. Natural Gas. Propane Gas. 1 year warranty. Hayward H-series Pool Heater provides an energy-efficient and environmentally responsible low NOx performance solution for pools and spas! Cupronickel Heat Exchanger with Totally Managed Flow provides exceptional corrosion resistance and erosion …, First, reset your heater thermostat. Now, set the temperature point below 104 degrees. Then, set the function “Ok”. Always keep the temperature under 104 degrees to allow the heater to heat the water at this temperature. Note: Learn how to fix CE code on Hayward pool heater. 4., Hayward Manuals. Heater. H150FDN. Troubleshooting manual. Hayward H150FDN Troubleshooting Manual. Universal h series heaters. Also See for H150FDN: Service & …, Hayward FDXLWPS1930 Water Pressure Switch Replacement for Hayward Universal H-Series Low Nox Pool Heater,Black 4.7 out of 5 stars 392 10 offers from $37.38 , When it comes to maintaining a pool, dealing with error codes on your Hayward pool heater can be a frustrating yet essential part of the process. As a pool, Use the “Mode” key to change your heater’s settings. Select the “Standby” Option and put the heater on it. Press the remote’s “Down” key and hold it and then press the Mode key and hold it simultaneously. For 3 seconds, hold down both the “Down” and “Mode” keys as long as the “bo” code doesn’t remove from your ..., Pentair 42002-0024S Pool Heater Pressure Switch: This pressure switch is specifically designed for Pentair pool heaters, but can also be used in other pool heaters that require a 2 PSI switch. Len Gordon 800120-1 Pressure Switch : This pressure switch is a direct replacement for Len Gordon pressure switches and is compatible with most pool heaters., Hayward Pool & Spa Heaters. 4 RESULTS. Hayward Universal H-Series Low NOx Induced Draft Residential Pool & Spa Heaters. Hayward Universal HC-Series Dual Fuel Technology Pool & Spa Heaters. Hayward H-Series Cupro-Nickel Heat Exchanger Above Ground Pool & Spa Heaters. Hayward Heater Tops & Vents for Indoor or Outdoor Use., Watch This!! Touched By The Sun Pools. 553 subscribers. Subscribed. 303. 159K views 5 years ago. Are you experiencing a LO code on your Hayward H-Series pool heater? If …, Hayward FDXLWPS1930 Water Pressure Switch Replacement for Hayward Universal H-Series Low Nox Pool Heater,Black 4.7 out of 5 stars 392 10 offers from $37.38, Hayward H400FDN Pdf User Manuals. View online or download Hayward H400FDN Owner's Manual, Troubleshooting Manual ... POOL AND SPA/HOT TUB HEATERS. Brand: Hayward | Category: Heater ... LO" Code. 46. Pressure Switch Adjustment. 49. IF" Code. 52. AC" Code. 57. AO" Code. 58. Heat Exchanger: Flow Requirements. 61., Hayward W3H400FDP Universal H-Series, Low NOx, 400,000 BTU, Propane Gas, Pool and Spa Heater delivering durability, reliability, and energy efficiency. FREE Standard Shipping On Orders $100 Or More! My Account, Our network of certified personnel can help you build your pool, recommend a product, repair a faulty product, and test your water. Find a professional near you. Hayward offers environmentally responsible, cutting-edge pool and spa equipment for residential and commercial, in-ground and above-ground pools., Steps to Maintain Your Hayward Pool Heater. Step 1: Turn off the power supply and gas valve before performing any maintenance. Step 2: Remove any debris from the heater and surrounding area using a soft brush or vacuum. Step 3: Inspect the heat exchanger for any signs of corrosion or buildup., Step 2: Locate the inlet and outlet valves on your pool heater. These are typically labeled with “in” and “out” indicators. Step 3: Turn the valves to the closed position. This will stop the water flow through the pool heater. Step 4: Install a bypass pipe between the inlet and outlet pipes on the pool heater.