Bo on hayward pool heater

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.

Hayward Manuals; Heater; H350FDP; Hayward H350FDP Manuals Manuals and User Guides for Hayward H350FDP. ... Category: Swimming Pool Heater | Size: 2.7 MB Table of Contents. Table of Contents. 2. Warnings. 4. Section I. General Information. 7. Section II. Consumer Operation & Maintenance . 8. Maintaining Proper Water Chemistry. 8. Lighting ...Medallion Energy 3055 Tech Park Way Deland, FL 32724 407-786-0000. Hours Mon-Fri: 8am – 7pm Saturday: 9am – 5pm Sunday: By AppointmentMake sure that the heater is in POOL or SPA mode. Press the MODE button on the user panel keypads to set the heater on STANDBY mode. On STANDBY mode, the heater will not heat the water. Press and hold the MODE and DOWN buttons for at least three seconds. The panel should display BO, which means bypass operation.Ray pack Heater troubleshooterJun 6, 2016 · I have 2003-vintage H400IDL2 Low NOx heater. Pool controls are Aqualink RS6. A few years ago the temperature sensor circuit on the RS6 board failed, so I have been manually turning the heater on/off since. (Previously the heater was in BO mode for remote operation.) I just upgraded the RS6 to iAqualink with the IQ900RS kit (rev R firmware). Key Takeaways. Understanding and resolving the bO Code on Hayward heaters involves cleaning the flame sensor, checking wiring connections, adjusting dip switch settings, and exiting bypass operation. Taking preventative measures such as proper installation & setup can help to avoid bO Code issues.It's not turning on. display just says BO. Everything is ... Second opinion] I have a 400000 btu hayward gas heater. I set it for 85 degrees and turned the pump on high. The heater doesn't start. only he "stand bye" light blinks rapidly. ... I have a Hayward H400 NG pool heater about 6yrs old. I always turn it on to keep it from not being usedHeatPro Heat Pump 140k BTU. Hayward. SKU: HP21404TC. High performance, energy-efficient HeatPro heat pumps quietly and economically maintain the ideal water temperature at all times. Add to Compare. Add to Export. Overview. Specifications.

Hayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience. Gain insight. ... Phase Heaters: 1.0000: Pool Type: In Ground: Product Dimensions: 24 " x 34 " x 29.5 "Product Height: 24 in: Product Length: 29.5 in: Product Weight: 195 lb: Product Width: 34 in:Nov 11, 2023 · Fits hayward universal h-series low nox pool heater models h150fdn, h150fdp, h200fdn, h200fdp, h250fdn, h250fdp; Also fits hayward universal h-series low nox pool heater models h300fdn, h300fdp, h350fdn, h350fdp, h400fdn, h400fdp; Weighs 20 pounds Monthly Filter Cleaning: Dirt can accumulate in your filters, causing restricted water flow which, in turn, might trigger the ‘LO’ code. It’s therefore crucial to clean your filters monthly, or more often if your pool sees heavy use. Adequate Water Flow: Ensure your pump is delivering the right flow rate to the heater.So the H250 with an input of 250,000 BTU’s actually puts 210,000 BTU’s into the water per hour. Discounting heat loss (which there is always some) if you are using a Hayward gas heaters to heat the 18,000 gallon pool we have discussed above you will need: 22.58 therms of natural gas. 24.75 gallons of propane.The control board oversees the operation of your heater, including monitoring temperature and safety features. In short, the Hayward Heater bD Code means there is a problem with the control board located on the right side of the heater. This can be caused by an open FC4 Fuse, faulty wiring, or a secondary high voltage fault.Connect the water supply: Attach the pool heater to the water supply, following the manufacturer’s instructions. Make sure to use the appropriate fittings and ensure a secure connection. Connect the gas supply: If you have a gas-powered hayward pool heater, connect it to the gas supply line using the correct fittings.A Bo Derek is a so-called perfect investment. The term comes from the 1979 movie "10," starring the actress Bo Derek, who depicted "the perfect woman." A &aposBo Derek&apos is a so...

Tel: 908.351.5400 www.haywardpool.com. Models HP6003T, HP11003T, HP2100TCO3T, HP21003T, HP21203T. OWNERS OPERATION & PARTS MANUAL. Basic safety precautions should always be followed, including the following: Failure to follow instructions can cause severe injury and/or death. This is the safety-alert symbol.Sep 10, 2023 · Consider the age of your pool heater: If your hayward pool heater is reaching the end of its expected lifespan, a replacement might be more cost-effective than constant repairs. Evaluate repair costs: Compare the cost of potential repairs to the price of a new hayward pool heater. If repairs are excessive, a replacement could be a smarter long ... It's not turning on. display just says BO. Everything is ... Second opinion] I have a 400000 btu hayward gas heater. I set it for 85 degrees and turned the pump on high. The heater doesn't start. only he "stand bye" light blinks rapidly. ... I have a Hayward H400 NG pool heater about 6yrs old. I always turn it on to keep it from not being usedStep 3: Ensure that the wire harness terminals on the water pressure switch are properly connected to the spade terminals. Step 4: Remove the wire leads from the water pressure switch and check for continuity across the switch while the pump is running. The LO code is not caused by a water pressure switch fault if it is closed. Reattach the …Learn How a Pool Works; Learn How Solar Pool Heaters Work; Learn About Hayward. At Hayward, we're more than just equipment. Learn more. Hayward Insights. Hayward Insights. Hayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience.Nov 11, 2023 · Fits hayward universal h-series low nox pool heater models h150fdn, h150fdp, h200fdn, h200fdp, h250fdn, h250fdp; Also fits hayward universal h-series low nox pool heater models h300fdn, h300fdp, h350fdn, h350fdp, h400fdn, h400fdp; Weighs 20 pounds

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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 & …#1. We got the pool running after the Texas freeze, but the remote isn't working for the heater. It shows the standard "bo" but it won't fire up. I was thinking it …Press the three buttons three times then set to pool OnA pool heater sizing chart is a useful tool that can help streamline the process. By cross-referencing the pool’s surface area with the average temperature increase desired, a sizing chart can provide a quick reference for the minimum BTU output needed. This eliminates much of the guesswork involved in heater selection and …Hayward pool heaters offer several advantages, including affordability, a wide range of options, and user-friendly controls. The company’s heaters are designed to be easy to use and install, making them a popular choice for pool owners who want a reliable heating option without breaking the bank. Hayward also offers a range of heater sizes ...May 31, 2023 · By following these guidelines, you can quickly get your pool heater back up and running efficiently. Hayward Pool Heater Parts Diagram Hayward Pool Heater BO Code What Does BO Code Mean? The Hayward Pool Heater BO code indicates a flame-sensing fault. It means that the heater is unable to detect the flame properly.

Was: $3,903.99. Quantity: Select all. Add selected to cart. Description. 0 Reviews. This Hayward W3HP21404T HeatPro Heat Pump 140K BTU (also known as HP21404T) is Hayward’s most powerful Pool Heat Pump with 140,000 BTU of heating power! You can’t get a more powerful pool heater from Hayward or from anyone else!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. Universal H Series Heaters® How To: Hayward H400FDN | Universal H Series Troubleshooting Guide - Page 13 and hold the minus button and 'MENU ICON' button for 3 seconds. Step 4 'bo' should appear on the display when the heater has successfully entered bypass mode. Once in bypass, press the 'MENU ICON ' button until 'POOL' or 'SPA' is illuminated. 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.Universal HC Series - Dual Fuel 400k BTU. Hayward. SKU: HDF400. The industry’s smallest footprint heater allows replacement of almost any heater in an existing pad with the efficient reliability of the new Universal HC Series dual-fuel technology heater from Hayward®. Add to Compare. Add to Export. Overview.TOP VENT PRO-INVERTER 13.5kW. SKU: PASRW030PUBP. Add to Compare. Showing 1-12 of 22. 1. 2. Heating swimming pools is a wise investment as it increases its value and extends the swimming season. So to graduate to a higher degree of comfort and control, choose a Hayward pool heater.Medallion Energy 3055 Tech Park Way Deland, FL 32724 407-786-0000. Hours Mon-Fri: 8am – 7pm Saturday: 9am – 5pm Sunday: By Appointment400,000 BTU heating capacity. Fits directly against walls, fences, or other equipment. Competitive heaters require 6–12" wall clearance. Ultra-compact frame for easy drop-in replacement. Dual-fuel tech switches between natural gas and liquid propane. Allows for in-field conversion with a quarter-turn.When it comes to enjoying your pool year-round, a properly sized pool heater is crucial. Choosing the right size heater ensures that your pool stays at the desired temperature, reg...POOL HEATER TEMPERATURE 🔐 UNLOCK !!! HAYWARD ,may work for different models,This is usually in your home's main electrical panel. Flip the breaker for your pool heater to the "Off" position, wait a few seconds, then flip it back to the "On" position. Finally, power your heater back on using the power switch. After a successful reset, your heater should be functioning correctly.To take a closer look or see other Hayward products please go to: www.hayward.com or call 1-800-432-8387 ... for ‘bo’ to appear. Heater must be in Spa or Pool Mode for bypass operation to work Temperature Lockout ... POOL SERVICE HEAT TEMP SET Max Pool Temp Limit is Pre-set To Energy-saving 90 F, See Owner’s Manual. 104 (default) ˜ashing ...

Mar 4, 2023 · First, check the power source. Make sure the heater is properly plugged in and that the circuit breaker or fuse hasn’t tripped. Next, check the water flow. A low water flow can cause the heater to overheat and shut down. Check the pool pump and filter for any clogs or debris that could be restricting water flow.

Shopping for Hayward Universal H-Series H350 Low Nox Pool Heater, 350,000 BTU, Natural Gas? Doheny's has it in stock now at the guaranteed lowest price. Enjoy FREE Expedited Shipping.Oct 18, 2020 ... was getting CE code, aka Communication Error. Replaced main board, display board, and display panel.Some of the most reviewed products in HAYWARD Pool Heaters are the HAYWARD Universal H-Series Propane Gas 150,000 BTU Low NOx Pool Heater with 5 reviews, and the HAYWARD Universal H-Series Natural Gas 400,000 BTU Low NOx Pool Heater with 4 reviews. Related Searches. hayward pool heater.For an event whose outcome is all but assured, the Bo Xilai trial—scheduled to begin in Jinan on Thursday—arrives with an unusual amount of fanfare. Bo is accused of bribery and ab...Jul 21, 2013 47,820 Northern NJ Pool Size 35000 Surface Plaster Chlorine Salt Water Generator SWG Type Pentair Intellichlor IC-60Was: $3,903.99. Quantity: Select all. Add selected to cart. Description. 0 Reviews. This Hayward W3HP21404T HeatPro Heat Pump 140K BTU (also known as HP21404T) is Hayward’s most powerful Pool Heat Pump with 140,000 BTU of heating power! You can’t get a more powerful pool heater from Hayward or from anyone else!Summary of Contents for Hayward H300FD. Page 1 POOL AND SPA/HOT TUB HEATERS H150FD, H200FD, H250FD, H300FD, H350FD, H400FD & H500FD MODELS OWNER’S MANUAL FOR YOUR SAFETY WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, PRINTED 10/24/2011 AT 1:13 PM injury, or death.CORROSION RESISTANT: Titanium heat exchanger ensures maximum heat transfer and provides excellent salt water and chemical corrosion resistance. UV-resistant body panels are impervious to corrosion and deterioration ; TRUSTED BRAND: With over 80 years of experience, Hayward is an industry leader in manufacturing advanced pool equipment. Page 4 of 24 HEATPRO HEAT PUMP HP13023772 Rev: B USE ONLY HAYWARD GENUINE REPLACEMENT PARTS Pomona, CA Clemmons, NC Nashville, TN Tel: 908.351.5400 www.haywardpool.com 6. If the pool/spa is used for therapy, it should be done with the advice of a physician. Always stir pool/spa water before entering the pool/spa to Press the ‘MENU ICON’ button to place the heater in ‘STANDBY’. ‘bo’ should appear on the display when the heater has successfully entered bypass mode. Press and hold the …

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Adjust the water flow or call a professional if the pressure is too low. Clean the Filter: A dirty or clogged filter can cause Hayward Heater CE Code errors. Clean the filter thoroughly and replace it if necessary. This will improve the heater’s efficiency and prevent future issues. Inspect the Ignition System: If the above steps do not ...400,000 BTU heating capacity. Fits directly against walls, fences, or other equipment. Competitive heaters require 6–12" wall clearance. Ultra-compact frame for easy drop-in replacement. Dual-fuel tech switches between natural gas and liquid propane. Allows for in-field conversion with a quarter-turn.Hayward strongly recommends that the installer read the manual before installing the swimming pool/spa/hot tub heater. ... shows the code “bo”. On the remote ...Posted December 8, 2021. I have a Hayward H400FDN pool heater. I just replace the main board and it worked fine. However, after putting the heater in bO mode to use the pools control panel vs manually on the heater itself it just cycles through the indicator lights on the keypad and won't do anything. I've reset the circuit breakers, unplugged ... HeatPro Variable-Speed Heat-Cool Pump 120k BTU. Heating swimming pools is a wise investment as it increases its value and extends the swimming season. So to graduate to a higher degree of comfort and control, choose a Hayward heating solution. For an event whose outcome is all but assured, the Bo Xilai trial—scheduled to begin in Jinan on Thursday—arrives with an unusual amount of fanfare. Bo is accused of bribery and ab...324. 160K views 5 years ago. A quick, simple, and to the point video on how to operate your Hayward H-Series Pool Heater both in natural gas or propane format. … HeatPro Variable-Speed Heat-Cool Pump 120k BTU. Heating swimming pools is a wise investment as it increases its value and extends the swimming season. So to graduate to a higher degree of comfort and control, choose a Hayward heating solution. First, check the power source. Make sure the heater is properly plugged in and that the circuit breaker or fuse hasn’t tripped. Next, check the water flow. A low water flow can cause the heater to overheat and shut down. Check the pool pump and filter for any clogs or debris that could be restricting water flow. ….

Hayward pool heaters offer several advantages, including affordability, a wide range of options, and user-friendly controls. The company’s heaters are designed to be easy to use and install, making them a popular choice for pool owners who want a reliable heating option without breaking the bank. Hayward also offers a range of heater sizes ...Aug 21, 2023 · Check the Gas Valve. Start by ensuring that the gas valve is open and allowing the flow of gas to the pool heater. If the gas valve is closed or partially closed, the heater won’t receive the necessary fuel to ignite. Make sure the valve is fully open and functioning correctly. POOL AND SPA/HOT TUB HEATERS H150FD, H200FD, H250FD, H300FD, H350FD, H400FD & H500FD MODELS SERVICE & INSTALLATION MANUAL FOR YOUR SAFETY This product must be installed and serviced by authorized personnel, qualified in pool/ ... Tel: 08-355-75 www.hayward-pool.comHere is the Hayward Pool Heater Manual. Don’t Miss: How Do I Reduce The Ph In My Pool. How To Put Hayward Heater In Bo Mode. Heres how you get your heater in Bypass Operation mode. 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.The tech did the install and ran the heater only for a few minutes to check for ignition and stuff. He had done some other plumbing work so he didn't want to run in too long, or the pool pump either, so that the PVC glue really had some time to cure. The heater is a 400,000 BTU Hayward Universal HC Series Model HDF400 Pool Heater.Change/Replace Combustion Chamber Disconnect gas & water unions Remove screw from Display Step 1 Step 2 Turn Power and gas off to unit, disconnect the gas Using a 5/16 nut driver or #2 Phillips Head line and plumbing unions from the heater. screwdriver, remove screw from below display.If you are a pool owner or planning to install a pool, one crucial aspect to consider is the size of the pool heater. A properly sized pool heater ensures that your pool water rema...Key Takeaways. The P5 code on Hayward pool heaters indicates a problem with the pressure switch. Common causes of the P5 code include clogged filters, improper water flow, and electrical issues. Troubleshooting steps for the P5 code involve checking water pressure, inspecting the heat exchanger, and verifying the gas supply. Bo on hayward pool heater, The pool heater will protect itself automatically by shutting off until the code is resolved. In most cases, the code is caused by a dirty filter, clogged skimmer, or half-open valve. However, another possibility is a faulty water pressure, vent pressure, or temperature limit switch. ... Hayward Heater bO Code [Solved] Maximizing Your Pool ..., A pool heater sizing chart is a useful tool that can help streamline the process. By cross-referencing the pool’s surface area with the average temperature increase desired, a sizing chart can provide a quick reference for the minimum BTU output needed. This eliminates much of the guesswork involved in heater selection and …, Hayward Pool Product Registration. Register your Hayward equipment now to receive a 90 day extended warranty, expert advice, rebate offers & more!*. June 30, 2023 NOTICE: Any applicable warranty coverage for a product shall not commence prior to the delivery date of that product notwithstanding anything stated elsewhere to the contrary., Details ADD TO CART. Raypak RP2100 Digital Natural Gas Heater, 266,000 BTU, Cupro-Nickel Heat Exchanger - P-R266A-EN-X #51. Part # P-R266A-EN-X #51. 4.82. $3264.00 IN STOCK. BTU 266,000 BTU Heat Exchanger Cupro-Nickel Ignition Electronic Manufacturer Raypak Heater Type Natural Gas. Details ADD TO CART., Many choose Hayward pool heaters to keep their pool water comfortable and warm. However, sometimes these heaters can experience issues that require a reset. To reset your Hayward pool heater, you’ll need to turn off the power, wait a few minutes, and then turn it back on again. This simple process can resolve many common […], When ordering parts, include the complete pool heater model number listed on the unit’s rating plate, located near the junction boxes on the exhaust side of the heater. (Example: HDF400) All ser- vice must be performed by a qualified technician. View and Download Hayward HDF400 installation & operation manual online., Mar 18, 2011 ... Pro Logic Heater Configuration. 4.8K views · 13 years ago ...more. Hayward Pool Products. 13.7K. Subscribe., #1. We got the pool running after the Texas freeze, but the remote isn't working for the heater. It shows the standard "bo" but it won't fire up. I was thinking it …, Summary of Contents for Hayward H300FD. Page 1 POOL AND SPA/HOT TUB HEATERS H150FD, H200FD, H250FD, H300FD, H350FD, H400FD & H500FD MODELS OWNER’S MANUAL FOR YOUR SAFETY WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, PRINTED …, Hayward HeatPro Heat Pump 140K BTU | Square Platform | W3HP21404T. 5.0 (2 REVIEWS) As low as $230.66/mo*. Learn About HeatPro Heat Pumps Hayward Pool Heaters., Dec 6, 2020 · Answering a viewers request on how to add and program a newly installed heater to a Hayward OmniLogic Automation system. , A quick, simple, and to the point video on how to operate your Hayward H-Series Pool Heater both in natural gas or propane format. This covers all models fro..., Change/Replace Combustion Chamber Disconnect gas & water unions Remove screw from Display Step 1 Step 2 Turn Power and gas off to unit, disconnect the gas Using a 5/16 nut driver or #2 Phillips Head line and plumbing unions from the heater. screwdriver, remove screw from below display. , Sep 24, 2019 · Problem Possible Cause Possible Solution; Heater cycles on & off: 1. Filter or pump baskets are dirty. 2. External bypass is out of adjustment. 3. Internal bypass is broken or stuck. , heater in STANDY . Press and hold the minus button and MENU I ON button for 3 seconds. bo should appear on the display when the heater has successfully entered bypass mode. Once in bypass, press the MENU I ON button until POOL or SPA is …, 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., View and Download Hayward HC Series troubleshooting manual online. Universal Heater. HC Series heater pdf manual download. Also for: Hdf400, Hdf275. ... In ground pool/spa gas heaters (44 pages) Heater Hayward Universal H-Series Low NOx Service & Installation Manual. Pool and spa/hot tub heaters (64 pages), Best Overall, Electric: FibroPool Swimming Pool Heat Pump at Amazon ($2,200) Jump to Review. Best Overall, Gas: Raypak Digital Low NOx Natural Gas 266,000 BTU Pool Heater at Amazon ($2,999) Jump to Review. Best Propane: Hayward Universal H-Series at Amazon ($3,999) Jump to Review., Jun 30, 2021 ... Comments3 · Universal H Series & ASME Gas Heater Installation, Start-up and Troubleshooting · Hayward Universal H-Series Pool Heater Installation..., HeatPro Heat-Cool Pump 140k BTU. High performance, energy-efficient HeatPro heat pumps quietly and economically maintain the ideal water temperature at all times. HeatPro features the industry's only standard Ultra Gold corrosion resistant evaporator fin which provides extreme durability, especially in coastal environments., Medallion Energy 3055 Tech Park Way Deland, FL 32724 407-786-0000. Hours Mon-Fri: 8am – 7pm Saturday: 9am – 5pm Sunday: By Appointment, I just purchased a hayward H100 propane pool heater. I had one in the past. The pool heater is connected correctly, has a full tank of propane, i even purchased a new igniter (a pool company recommend … read more, Adjust the water flow or call a professional if the pressure is too low. Clean the Filter: A dirty or clogged filter can cause Hayward Heater CE Code errors. Clean the filter thoroughly and replace it if necessary. This will improve the heater’s efficiency and prevent future issues. Inspect the Ignition System: If the above steps do not ..., 400,000 BTU heating capacity. Fits directly against walls, fences, or other equipment. Competitive heaters require 6–12" wall clearance. Ultra-compact frame for easy drop-in replacement. Dual-fuel tech switches between natural gas and liquid propane. Allows for in-field conversion with a quarter-turn., I have 2003-vintage H400IDL2 Low NOx heater. Pool controls are Aqualink RS6. A few years ago the temperature sensor circuit on the RS6 board failed, so I have been manually turning the heater on/off since. (Previously the heater was in BO mode for remote operation.) I just upgraded the RS6 to iAqualink with the IQ900RS kit (rev R firmware)., Encountering a ‘Bo Code’ on your Hayward pool heater can be frustrating, but with the right approach, you’ll get your heater back up and running smoothly. Here’s what you need to do: Reset Your Heater. To clear the ‘Bo Code’, the first step is a simple reset: Turn off the pool heater and disconnect it from the power source., According to the pool tech, the heater shouldn't have been functioning without being in 'bo' mode, but I don't buy that. This heater has a 2 wire control by the way. Willing to pay whoever can get me a final resolution to this problem., 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. , Jun 11, 2023 · So the H250 with an input of 250,000 BTU’s actually puts 210,000 BTU’s into the water per hour. Discounting heat loss (which there is always some) if you are using a Hayward gas heaters to heat the 18,000 gallon pool we have discussed above you will need: 22.58 therms of natural gas. 24.75 gallons of propane. , Universal H Series Heaters® How To: Hayward H400FDN | Universal H Series Troubleshooting Guide - Page 13 and hold the minus button and 'MENU ICON' button for 3 seconds. Step 4 'bo' should appear on the display when the heater has successfully entered bypass mode. Once in bypass, press the 'MENU ICON ' button until 'POOL' or 'SPA' is illuminated., May 29, 2018 ... The LO code on a Hayward heater means Limit Open, where one of the limit switches is not closing to complete the circuit., Learn the basics of tankless water heater installation and replacement, including the cost, materials and tools needed to get the job done. By clicking "TRY IT", I agree to receive..., Propane heaters can make cold winter nights a lot more bearable. Here's a list of some of the best indoor and outdoor propane heaters to keep you warm this winter season. If you bu...