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Mar 16, 2018. #1. We have a Hayward H400IDL2 pool heater that ignites and runs normally at start up. After about 10 minutes it begins to repeatedly cycle off and on before finally throwing an IF code. We've had multiple service calls from 2 different pool companies and have replaced the gas valve, flame sensor, igniter and control board.Exact fit for Hayward heater. Replacement part for leaking unit. Part came with new O rings and everything on the header assembly. Easily installed with directions included. Read more. ... I bought the new sensor due to a LO code, but the real issue was low water pressure due to a dirty DE filter!!!!! This replacement part is an exact fit, and ...Short answer Troubleshooting Cloudy Pool Water: Causes and Solutions: Cloudy pool water can be caused by a variety of factors including high pH or alkalinity, algae growth, insufficient filtration, and poor circulation. Treatment options include balancing chemicals, shocking the pool, improving filtration system, and vacuuming debris. Proper maintenance and routine testing can prevent cloudy ...The LO code on a Hayward heater means Limit Open, where one of the limit switches is not closing to complete the circuit. To clear the LO code, fix or replace the wiring on the limit switches and any other …Aug 9, 2022 · 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.Turn off the pool heater using the power switch or breaker. Wait for at least 30 seconds to ensure the heater completely powers down. Turn the power back on and observe the display board. If the display board is functioning properly, it should show the default screen or a startup message.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 …To reset the Hayward OmniLogic system, simply turn off the power at the breaker, then turn it back on to let the system reboot. This will usually fix any connectivity issues with the WiFi network. However, if the system continues to lose connection, it could be due to wireless interference, a weak Wi-Fi signal, or a malfunctioning server.Hayward HDF400 | Universal HC Series Heater Troubleshooting Guide - Page 44 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" Hayward HDF400 | Universal HC Series Heater Troubleshooting Guide - Page 45 11.Enter a postal code to find the nearest Hayward authorized pool professional. Postal Code: How far from the above postal code do you want to search? Enter the miles in the box below. Minimum of 10 miles, maximum of 100. Radius: miles. Pool Type: ... Heaters (not including Heat Pumps) Heat Pumps. Lighting. Pumps. Variable Speed Pumps ...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. 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.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. None of the buttons on the facepl … read moreHeat Pump; Appliance Repair « Prev Troubleshooting LG Washing Machine Errors with Fault Codes Next » Troubleshooting Magnetron Failure Discovering What Causes a Magnetron to Fail in a MicrowaveAt lower pool temps the heater would fire up and stop when it reached 81 degs. Yesterday the heater would NOT fire up and the readout had a blinking 65 degree reading. None of the keys worked and there was no diagnostic codes displayed. The little red pool light was still on. 110v power to the heater is OK. I wiggled all the pushon connectors.A "lo code" on a Hayward heater indicates a low voltage or power issue. Troubleshooting the issue can be done by checking the voltage at the heater's power source and making sure that the wiring inside the heater is connected properly. The best way to prevent a "lo code" on a Hayward heater is to make sure that the voltage at the …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.THanks for your help and advice I have an older H400 Hayward Pool heater that is struggling to heat the water . Mostly it is working but keeps going off on "LO" . BUt after a time it seems to cool and then kick back on . I did change the pressure switch last year and it did not seem to be the problem but it should have been the fix .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.If it’s primed and pumping and you have LO clean your filter cartridge. If that doesn’t work run the system with the cartridge removed and see if it it fires. If it does buy a new cartridge. If it still doesn’t work call Hayward cuz you could have a bad a pressure/flow sensor. 2.***UPDATE: A few people have asked how to access the brass fuel injectors. I mention it at 4m 14s into the video but this other video gives a much better de...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 …heater and to all metal parts of swimming pool or spa, and to all electrical equipment, metal piping (except gas piping), and conduit within 5 ft. (1.5 m) of inside walls of swimming pool or spa. IMPORTANT -Refer-ence NEC codes for all wiring standards including, but not limited to, grounding, bonding and other general wiring procedures.It is a Hayward pool heater and the code stands for low water pressure. The pressure switch and temperature sensors are new and the heat exchanger is new . Sand filter has been backwashed and all filters cleaned . It fires up and runs for a couple minutes then it shuts off with the LO code coming on

If it’s primed and pumping and you have LO clean your filter cartridge. If that doesn’t work run the system with the cartridge removed and see if it it fires. If it does buy a new cartridge. If it still doesn’t work call Hayward cuz you could have a bad a pressure/flow sensor. 2.Oct 24, 2019 ... One of the most common calls we receive during season is the FLO error on a pool heater. Learn more about what causes this error and how we ...May 17, 2020 ... cOP code Hayward HP21104T heat pump swimming pool heater, coil defrost sensor failed. · Comments1.#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 filter is clean and the output is strong.

Hayward H150FDP Pdf User Manuals. View online or download Hayward H150FDP Troubleshooting Manual ... Brands; Hayward Manuals; Heater; H150FDP; Hayward H150FDP Manuals. Manuals and User Guides for Hayward H150FDP. We have 1 Hayward H150FDP manual available for free PDF download: Troubleshooting Manual ... LO" …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 to its Low NOx capabilities. The Hayward Universal H-Series gas heater meets or exceeds the South Coast Air Quality Management District'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...…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. my hayward heater works in spa mode but when it goes to po. Possible cause: Hayward Pool heater LO error.