Hayward heater lo - I was given a heater with the used pool I purchased. Previous owner indicated it worked, but leaked. I decided to see what was wrong. As it turns out there ...

 
The Hayward pool heater spa mode is designed to maintain a specific “spa-like” temperature in the pool. To use this mode, enable “Spa mode” from the control panel, set the required temperature, and let the pool heater warm the water. Once ready, test the water. This process is a joy to behold for those who want to soak themselves in .... Biglerville fall festival

Service LED ON: “LO” Code “LO” Code (Limit Open) may relate to water flow. Verify the pump is running & adequate water is flowing through heater. “LO” is NORMAL when the …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 ; Weight 4.8 poundsResidential: Heaters. Hayward has an advanced lineup of heaters and heat-cool pumps to deliver the ultimate control of water temperature and efficiency. Learn More. Download Assets. 49 Items.PREMIUM PERFORMANCE: The Hayward Universal H-Series 250,000 BTU Natural Gas Heater delivers fast premium heating performance for years of reliable, long-lasting comfort. CORROSION PROTECTION: The Universal H-Series boasts exceptional protection against corrosion and premature failure caused by unbalanced water chemistry.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 ...Here are some of the best outdoor heaters for restaurants to keep your customers warm and cozy when they want to dine outdoors to enjoy a meal. If you buy something through our lin...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 ...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 ...Change the sand in a Hayward sand filter by washing the old sand through the drain plug using a garden hose and then replacing it with 300 pounds of 20-mesh swimming pool filter sa...I was given a heater with the used pool I purchased. Previous owner indicated it worked, but leaked. I decided to see what was wrong. As it turns out there ...Apr 12, 2020 ... How to start/light a Hayward Universal H-Series heater at the control panel on the heater.The Universal H-Series 400,000 BTU Natural Gas Pool & Spa Heater from Hayward provides reliable, long-lasting comfort for pools and spas with a surface area up to 1,200 ft. Built with a durable cupro nickel heat exchanger, it offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring you ...What Causes the Hayward Heater LO Code? 1. There Is A Fault With The Water Pressure Switch. How to diagnose if the water pressure switch has a fault; LO CODE FIXES. Step 1: Inspecting the Water Pressure Switch Wiring; Step 2: Testing Water Pressure Switch Continuity; Step 3: Pressure Switch Adjustment (If Required)Hayward pool heaters are known for their durability and ease of use. They are designed with a cupro-nickel heat exchanger that resists corrosion and lasts longer than traditional copper exchangers. Hayward heaters also come with a digital control panel that allows you to adjust the temperature and settings easily.I was given a heater with the used pool I purchased. Previous owner indicated it worked, but leaked. I decided to see what was wrong. As it turns out there ...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, …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 ... Verify the pump is running & adequate water is flowing through heater. "LO" is NORMAL when the pump is turned off or there is and place it on the terminal with the white wire on the gas valve, then Go To Step 11C. 44; Hayward HDF400 | Universal HC Series Heater Troubleshooting Guide - Page 45 11. H-Series 135k BTU - Propane. Hayward. SKU: H135IDP1. Hayward's induced draft heater for above ground pools and spas combines reliable technology with ease of operation and superior performance. Add to Compare. Add to Export. Overview. Specifications. Power cycle heater Call for heat and test gas valve Step 10A... Page 44: Lo: Code 11. Service LED ON: “LO” Code “LO” Code (Limit Open) may relate to water flow. Verify the pump is running & adequate water is flowing through heater. “LO” is NORMAL when the pump is turned off or there is insufficient water flow. 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.Hayward's Universal H-Series 250,000 BTU Natural Gas Heater combines advanced technology with universal fit flexibility, making it the perfect heater for new or existing installations. This new design offers left-side or right-side electric, gas and water connections, with 110v or 220v electric hook up.LO on a Hayward Heater#VSP#2speedpump#backwashfilter#cleanfilter#aqualogicSolar water heaters could help cut your utility bills. Visit HowStuffWorks to learn about solar water heaters. Advertisement Heating up water accounts for a good chunk of a home's ... This video goes over resolving a likely cause to the LO error code that comes up on Hayward H series pool heaters. Here's a link on the part you will likely... View online or download Hayward H350FDP Owner's Manual, Troubleshooting Manual. ... Hayward Manuals; Heater; H350FDP; Hayward H350FDP Manuals Manuals and User Guides for Hayward H350FDP. We have 5 Hayward H350FDP manuals available for free PDF download: Troubleshooting Manual, ... LO" Code. 46. Pressure Switch Adjustment. …First, turn off the power to the pool heater circuit breaker. This should immediately shut down the pool heater. If the circuit breaker does not shut off, you should call a professional service technician to come out and inspect the problem. Next, check the fuse box located near the pool pump. The fuses should be in good condition.The Universal H-Series 400,000 BTU Natural Gas Pool & Spa Heater from Hayward provides reliable, long-lasting comfort for pools and spas with a surface area up to 1,200 ft. Built with a durable cupro nickel heat exchanger, it offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring you ...LO Code Pages 40-43 IF Code Pages 44-46 AC Code Page 47 AO Code Page 48-50 ... Heater must then be in Spa or Pool Mode for operation. The heater will ... Hayward Part # FDXLFSKF30 (Qty. 10) Step 1: Page 14 Verify incoming voltage to heater is present (110-125 or 220-245 VAC), ifView online or download Hayward H150FDN Owner's Manual, Troubleshooting Manual. ... Hayward Manuals; Heater; H150FDN; Hayward H150FDN Manuals. Manuals and User Guides for Hayward H150FDN. We have 3 Hayward H150FDN manuals available for free PDF download: Troubleshooting Manual, ... LO" Code. 46. Pressure Switch Adjustment. … Universal H-Series ASME heater suited to every setup. Front single-panel access means service is quick and easy. BEST-IN-CLASS HEATING SPEED Universal H-Series ASME heaters boast industry-leading hydraulics, with the 500,000 BTU model achieving the fastest speed-to-heat in its class. Its quick and efficient operation means Jun 22, 2016 ... From https://www.swimmingpoolsteve.com/pages/heater-break.html - If you have a problem with your pool heater in that it will not fire or ...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 ; Weight 4.8 poundsI was given a heater with the used pool I purchased. Previous owner indicated it worked, but leaked. I decided to see what was wrong. As it turns out there ...May 6, 2022 · 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. Reasons Behind the ‘LO’ Code. When your Hayward heater flashes the ‘LO’ code, it’s alerting you to potential problems that need your immediate attention. …Another reason why your Hayward heater may display the LO code is due to a defective temperature limit switch. As the name suggests, the temperature limit switch has the role of limiting the temperature of the pool heater to within safe limits. Its also called the furnace plenum thermostat. If its faulty, the LO code might be displayed.Dec 2, 2021 · How 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. Wiring the heater to the load side of the timer or controller will not result in a 2-minute delay if the pump primes quickly enough to activate the heater’s water pressure switch. If the pump is slow to prime the heater may display an “LO” fault code and will take 2 minutes to automatically restart. If the pump has primed, thisVerify the pump is running & adequate water is flowing through heater. "LO" is NORMAL when the pump is turned off or there is and place it on the terminal with the white wire on the gas valve, then Go To Step 11C. 44; Hayward HDF400 | Universal HC Series Heater Troubleshooting Guide - Page 45 11.Apr 22, 2023 · I fixed Lo error! hayward spa heater was giving me a LO error when I turned it This is how I fixed it within less than a minute easy steps. Hayward H250 Quick Manual (4 pages) Universal H-Series POOL AND SPA HEATERS. Brand: Hayward | Category: Swimming Pool Heater | Size: 0.8 MB. Hayward H250 Pdf User Manuals. View online or download Hayward H250 Installation, Operation & Service Procedures, Installation, Operation And Service Manual, Quick Manual.The Hayward Universal H-Series gas heater is the "universal" energy efficient remedy for any new or existing pool or spa. An industry leading hydraulic design reduces circulation pump run time to provide energy savings of up to 18% when compared to less efficient competitors. The energy efficiency of the Universal H-Series gas heater combines ...NOTE: the maximum temperature set point is 104° F. 13. Hayward H400FDN | Universal H Series Troubleshooting Guide - Page 14. in bypass mode for external control. Step 1 Step 2 Press the 'MENU ICON' button to place the heater in 'STANDBY' mode. Step 3 Press and hold the minus & plus buttons for 3 seconds.This article will decode the mystery behind Hayward pool heater error codes. You’ll learn what each code means and how you can troubleshoot them effectively. …HI, I have a Hayward Pool Heater Lo Hox (I think the name) it is about 40,000 BTU natural gas 240 Volt. Blower moter in side. It has ran great for the past 6 or so years. Last fall I was in the pool h … read moreLos Angeles is one of the most popular cities in the world, and you probably already know a thing or two about it and its geography. It’s home to Hollywood, Los Angeles, CA, it’s a...H-Series 135k BTU - Propane. Hayward. SKU: H135IDP1. Hayward's induced draft heater for above ground pools and spas combines reliable technology with ease of operation and superior performance. Add to Compare. Add to Export. Overview. Specifications.View online or download Hayward H400FDN Owner's Manual, Troubleshooting Manual. ... Hayward Manuals; Heater; H400FDN; Hayward H400FDN Manuals. Manuals and User Guides for Hayward H400FDN. We have 4 Hayward H400FDN manuals available for free PDF download: Troubleshooting Manual, ... LO" Code. 46. Pressure Switch Adjustment. …Dec 6, 2020 · Answering a viewers request on how to add and program a newly installed heater to a Hayward OmniLogic Automation system. Sep 22, 2018 ... My pool heater stopped working and the display showed IO which means the igniter is bad. It was replaced and still showed that code. Models manufactured before Sept. 2010: measure across pins 1-2 (black & red), then 3-4 (white & blue) for 8-9 ohms. Models after Sept. 2010: measure for 4-5 ohms across the two terminal with wires. IF out-of-range, replace blower (pg. 20). IF correct, contact technical support (908)355-7995. Dec 13, 2023 · What Causes the Hayward Heater LO Code? 1. There Is A Fault With The Water Pressure Switch. How to diagnose if the water pressure switch has a fault; LO CODE FIXES. Step 1: Inspecting the Water Pressure Switch Wiring; Step 2: Testing Water Pressure Switch Continuity; Step 3: Pressure Switch Adjustment (If Required) 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 ...Hover Image to Zoom. $ 3999 00. $334.00 /mo† suggested payments with 12 months† financing Apply Now. Offers heating that is energy efficient and environment friendly. Please review the For Your Swimming Pool brochure. Patented bypass design ensures better hydraulic performance. View More Details.View online or download Hayward H250FDP Owner's Manual, Troubleshooting Manual. ... Hayward Manuals; Heater; H250FDP; Hayward H250FDP Manuals. Manuals and User Guides for Hayward H250FDP. We have 6 Hayward H250FDP manuals available for free PDF download: Troubleshooting Manual, ... LO" Code. 46. Pressure Switch Adjustment. …NEW Hayward Universal H-Series Low NOx heater combines industry-leading hydraulic performance; environmentally responsible low NOx emissions and a standard cupro nickel heat exchanger with a low profile appearance, lighter weight design, independent left or right side electric, water and gas connections plus 2" x 2 1/2" CPVC union connections ...What causes error code LO on a Hayward pool heater? Generally, LO refers to the pressure switch, water pressure. This can be caused by either the diaphram in the flow switch has …Hayward Heater LO code. Thread starter joeg679; Start date Jul 19, 2023; Jump to latest Follow Reply Forums. Equipment - Build, Use, and Repair. Pumps, Filters, and Plumbing . 1; 2; Next. 1 of 2 Go to page. Go. Next Last. J. joeg679 Member. May 28, 2017 21 NJ. Jul 19, 2023; Add bookmark #1 Hello, I was getting a Lo code on my heater …NEW Hayward Universal H-Series Low NOx heater combines industry-leading hydraulic performance; environmentally responsible low NOx emissions and a standard cupro nickel heat exchanger with a low profile appearance, lighter weight design, independent left or right side electric, water and gas connections plus 2" x 2 1/2" CPVC union connections ...Jan 11, 2022 · Step 3: If yes, disconnect the p4 plug from the connection and take the voltage reading of pins 4 and 6. Here you will also get reading for 110-125 VAC. Step 4: In case you are getting the right voltage in both cases, it’s a must say that the fuse is blown and you need to replace it. LO Code Pages 40-43 IF Code Pages 44-46 AC Code Page 47 AO Code Page 48-50 ... Heater must then be in Spa or Pool Mode for operation. The heater will ... Hayward Part # FDXLFSKF30 (Qty. 10) Step 1: Page 14 Verify incoming voltage to heater is present (110-125 or 220-245 VAC), ifHayward H-Series Heater Intergrated Control Circuit Board | IDXL2ICB1931. THIS IS USED IN THE HAYWARD H SERIES LO-NOX HEATERS MADE AFTER 9-20-2004. THE BOARD HAS 3 AMP STYLE PLUG FEMALE CONNECTORS: 1- 4 PIN, 1- 3 PIN, 1 - 2 PIN. THERE IS ALSO A PRESSURE SWITCH / HIGH LIMIT 6 PIN MALE CONNECTOR …The flagship of our H-Series line, they combine industry-leading hydraulics, exceptional performance, energy efficiency, and reliability, with planet-friendly low-NOx emissions. Flexible connection options make them ideal for new or existing applications. Choose from 6 250,000, 400,000 and 500,000 BTU natural gas or propane models.Jun 14, 2016 · I have Hayward H150FDN Universal H-Series, Low NOx, 150,000 BTU, Natural Gas, Pool and Spa Heater and I am getting a LO code with is a flow problem. I have my intermatic timer set for 755am to turn on and give my equipment power, then at 8am the Hayward pump turn on. 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.View and Download Hayward Universal H-Series Low NOx owner's manual online. POOL AND SPA/HOT TUB HEATERS. Universal H-Series Low NOx heater pdf manual download. Also for: H250fdn, H250fdp, H350fdn, H350fdp, H400fdn, H400fdp.I have a Hayward 300k BTU heater. It's light comes on and shows low. When water pressure increases the "Lo" sign goes away but I can't get the mode to switch to pool.Change the sand in a Hayward sand filter by washing the old sand through the drain plug using a garden hose and then replacing it with 300 pounds of 20-mesh swimming pool filter sa...Professional Service: If you’ve tried the above steps and the LO code persists, it’s advisable to contact a professional pool heater technician. They can diagnose the issue more accurately and perform any necessary repairs. Preventing Future LO Codes. To avoid encountering the Hayward Heater LO Code in the future, consider implementing ...Hayward Heater LO code. Thread starter joeg679; Start date Jul 19, 2023; Jump to latest Follow Reply Forums. Equipment - Build, Use, and Repair.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.Jandy Aquapure 1400. Jul 4, 2022. #5. 1poolman1 said: The "brass plug" is actually one of the limit switches. If there is enough wire, try splicing them back together. If not, you will need to get a new one. The heater is sensing an "open" condition on the limit switch and won't allow the ignition process to go any further than "fan on."Page 1 HAYWARD ® POOL AND SPA/HOT TUB HEATERS H250FDN & H250FDP; H350FDN & H350FDP; H400FDN & H400FDP MODELS SERVICE & INSTALLATION MANUAL FOR YOUR SAFETY WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, injury, or …Hayward Pool heater LO errorLos Angeles is one of the most popular cities in the world, and you probably already know a thing or two about it and its geography. It’s home to Hollywood, Los Angeles, CA, it’s a...View online or download Hayward H300FDP Owner's Manual, Troubleshooting Manual. ... Hayward Manuals; Heater; H300FDP; Hayward H300FDP Manuals. Manuals and User Guides for Hayward H300FDP. We have 3 Hayward H300FDP manuals available for free PDF download: Troubleshooting Manual, ... LO" Code. 46. Pressure Switch Adjustment. … Shop for a Hayward W3H400FDP Universal H-Series H400 Low NOx Pool Heater, 400,000 BTU, Propane Gas at The Pool Supplies Superstore. FREE Shipping & Unbeatable Low Prices. Universal H-Series ASME heater suited to every setup. Front single-panel access means service is quick and easy. BEST-IN-CLASS HEATING SPEED Universal H-Series ASME heaters boast industry-leading hydraulics, with the 500,000 BTU model achieving the fastest speed-to-heat in its class. Its quick and efficient operation meansHayward H-Series Heater Intergrated Control Circuit Board | IDXL2ICB1931. THIS IS USED IN THE HAYWARD H SERIES LO-NOX HEATERS MADE AFTER 9-20-2004. THE BOARD HAS 3 AMP STYLE PLUG FEMALE CONNECTORS: 1- 4 PIN, 1- 3 PIN, 1 - 2 PIN. THERE IS ALSO A PRESSURE SWITCH / HIGH LIMIT 6 PIN MALE CONNECTOR …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 ... 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. * Texas Heater Kits Available * 500,000 BTU provides unprecedented speed to heat, with just 2 models delivering 1 million BTU’S while using minimal pump room space SpecificationsHayward pool heaters are known for their durability and ease of use. They are designed with a cupro-nickel heat exchanger that resists corrosion and lasts longer than traditional copper exchangers. Hayward heaters also come with a digital control panel that allows you to adjust the temperature and settings easily.

Hayward Heater LO code. Thread starter joeg679; Start date Jul 19, 2023; Jump to latest Follow Reply Forums. Equipment - Build, Use, and Repair. Pumps, Filters, and Plumbing . 1; 2; Next. 1 of 2 Go to page. Go. Next Last. J. joeg679 Member. May 28, 2017 21 NJ. Jul 19, 2023; Add bookmark #1 Hello, I was getting a Lo code on my heater …. Helen ga halloween 2023

hayward heater lo

View online or download Hayward H350FDP Owner's Manual, Troubleshooting Manual. ... Hayward Manuals; Heater; H350FDP; Hayward H350FDP Manuals Manuals and User Guides for Hayward H350FDP. We have 5 Hayward H350FDP manuals available for free PDF download: Troubleshooting Manual, ... LO" Code. 46. Pressure Switch Adjustment. …This FD ignitor kit is designed to use with Hayward Universal H-Series Low NOx pool heater models H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP, H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, H400FDP. Weighs 5.9 pounds.Step 4: Disconnect Blower connector from the Control Module.Set the heater to the Pool or Spa setting. To generate a call for heat, lower the set point temperature. Step 5: Measure 120VAC along pins 1 and 2 during the pre-purge period.H-Series 135k BTU - Propane. Hayward. SKU: H135IDP1. Hayward's induced draft heater for above ground pools and spas combines reliable technology with ease of operation and superior performance. Add to Compare. Add to Export. Overview. Specifications.What Is My Hidden Talent. Flat Creek Lodge Hayward. 10290 Highway 27 South, Hayward, WI 54843.Enter Dates. From $135. Check In. 15 00. Check Out. 15 00.. Browse and compare Hayward motels when you search with Expedia. Read reviews, search by map, and book the best motels in Hayward that suit your needs with …For people using gas water heaters, two options are offered--natural gas or propane. According to Energy Star, 15 percent of a home’s energy use is attributed to heating water. Bot...My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every …Aug 7, 2021. #1. Hello, I have a H150FDN pool heater. It's worked all summer so far, but last week I noticed that it would turn on for a few minutes then turn off and show Lo. The …The Pontiac Grand Prix has a blower motor that is regulated with a fuse located in the fuse panel inside the glove box. If the blower motor in your Grand Prix is malfunctioning, yo...Another reason why your Hayward heater may display the LO code is due to a defective temperature limit switch. As the name suggests, the temperature limit switch has the role of limiting the temperature of the pool heater to within safe limits. Its also called the furnace plenum thermostat. If its faulty, the LO code might be displayed.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...Faulty water temperature switch, malfunctioning vent pressure switch, and defective temperature limit switch are accountable for displaying the Hayward pool heater LO code. Also, the damaged flow switch diaphragm and clogged filter are responsible for showing this code on your pool heater. However, going through the article, you will learn all about reasons behind LOApril 9, 2023 by William. Hayward pool heater IF code basically signifies the ignition failure of your heater system. The major reasons for Hayward pool heater code IF/ignition failure include lower gas supply, clogged filter, and malfunctioning of the gas and plumber valve. Also, a faulty transformer, defective flame sensor, bad igniter, and ...My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the filters - still LO 2. Checked wires at pressure switch for continuity - still LO 3.If your Hayward pool heater is displaying the LO code, it means that the limit string is open and the heater will shut down and enter lockout mode. To fix the problem and close the limit string, you’ll need to wait 2 minutes for the automatic restart. A malfunctioning temperature limit switch, water pressure switch, or vent pressure switch ...Wiring the heater to the load side of the timer or controller will not result in a 2-minute delay if the pump primes quickly enough to activate the heater’s water pressure switch. If the pump is slow to prime the heater may display an “LO” fault code and will take 2 minutes to automatically restart. If the pump has primed, this.

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