Hayward pool heater says lo

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), if

Hayward pool heater says lo. Aug 8, 2018 · Hi all. 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).

Universal H-Series Natural Gas 400,000 BTU Low NOx. Hayward. SKU: W3H400FDN. The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional. Add to Compare. Add to Export.

Stumbling upon a ‘LO’ code on your Hayward heater can be quite the head-scratcher. Don’t worry, you’re about to unravel the mystery behind this cryptic message. This code typically indicates a water temperature sensor error, but it can also be a sign of other underlying issues with your pool 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.We have a Hayward 400 heater and a Hayward ecostar variable speed pump. We tried to turn on the heater last night for the spa and it would turn on and then off a few seconds later. The people in the spa could feel hot water for a few seconds and then it would just come out cold.My pool heater would not fire and was showing the LO (low flow) code. This shows where the adjustment knob is on the pressure switch and insight into how to ...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.This item: Hayward W3H200FDN Universal H-Series 200,000 BTU Natural Gas Pool and Spa Heater for In-Ground Pools and Spas $2,899.00 $ 2,899 . 00 Get it May 7 - 9

The heater may require a new gas valve, burner orifices and/or air restrictor plate upon conversion. Hayward offers conversion kits through your local Hayward dealer. A licensed or certified gas professional will need to perform the conversion. NOTE: Gas fired heaters should be diagnosed and repaired by trained personnel.The chemical part of opening is done. I put salt in today as pool temp was 72 degrees (heater hasnt been running yet) and i think I'm supposed to turn on the chlorinator but google says to wait 24 hours after putting in salt so I'm going to turn it on tomorrow.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. BTU Rating: 399900. 199900. 200000. 399900. Pickup at South Loop.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 CART.Pump is running, water is flowing through heater, heater plugged in, gas on. Service panel says Lo and "service". ... I am getting LO on my Hayward gas pool heater. It was fine 2 weeks ago but the weather has been cold so we did not turn the heater on. I previously cleaned the cartridges when we opened the pool.Hayward H350FDP Manuals. Manuals and User Guides for Hayward H350FDP. We have 5 Hayward H350FDP manuals available for free PDF download: Troubleshooting Manual, Service & Installation Manual, Owner's Manual.

Mark shows us in this video how to do troubleshooting for a heater, he walks us through all of the steps. For all the pool knowledge you're looking for, chec...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!It now says LO on screen. It's a h 400 propane. Pool and Spa Expert: ... I have an older swimming pool heater a Hayward H400 PED2 that fires up just fine but will shut down in about 2 minutes. When I switch the mode to standby and back to spa the same thing happens.This is a very common question from those looking to heat a swimming pool or spa. Typically, most homeowners look for about a 10° degree rise from the outside temperature to the swimming pool. We have seen most pools at a temperature of 86°-88° degrees Fahrenheit (30°-31° Celsius), but have known some to get in the upper 90°s (32 ...

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The heat exchanger may be leaking because: (1) Chemical imbalance. (2) Sanitizer damage. (3) Winter freeze damage. (4) Failed joints. Regardless of the reason, a Hayward service company must be contacted to inspect the failed exchanger. Contact an Authorized Hayward Dealer/technician for examination.Low Pressure Switch Lockout. The control ignores an open low pressure switch for the first 30 seconds after the compressor is energized. If the low pressure switch opens for 3+ seconds any time after this 30 second period, the compressor will shut down and " Lo Press Trip " will show on the display. If the low pressure switch trips 6 times ...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) Step 4: Temperature Limit Switch Wiring Inspection. Step 5: Continuity Test for Temperature Limit Switches.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...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.

While all Hayward H-Series heaters are energy-efficient, the Universal H-Series 400 Low NOx heater has an 83-84 percent industry-leading thermal efficiency. ... Hayward Universal H Series Low NOx 400,000 BTU Natural Gas Swimming Pool Heater Product Code: W3H400FDN Maximum Altitude: 10,000 FT BTU Rating: 400,000 BTUs Heater Type: Natural Gas ...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.If the Flowsensor persistently detects a No Flow state the system may need to be inspected and maintained by a Hayward Authorized Servicer . The Flowsensor detects water flow from the filter pump in a Body Of Water. It is unsafe to run water treatment features, such as heating, Chlorination, or pH adjustments while there is no water flow.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...Pool Length m: 10: Pool Width m: 6: Pool A. Depth m: 1.4: Pool surface area sq.m: 60: Pool surface area sq.ft: 645.6: Pool Volume cu.m: 84: Pool volume litrs: 84000: Pool Volume USGallons: 22176: Turnover time hr: 6: Flow rate required gpm : Flow rate required cu.m/h : Water Temperature Required deg C : Air temperature around pool deg C ...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. 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. Blocked Baskets. Another reason your pool heaters say no flow is because of blocked baskets. Like filter and Impeller, full baskets are also caused by some debris and dirt. CHECK PRICE. However, you can clean it by freeing both the pump and skimmer basket, allowing the water to flow freely.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.The Hayward Pro Logic is a multifunction pool controller used to fully manage your pool/spa sys-tem. The Pro Logic can control pumps, valves, lighting, heaters, and chlorination. Although the Pro Logic is easy to use, it is important to completely read through this operating manual before attempting to operate the control.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 Expert. ... Pool just opened. Turned on heater - Says needs service - temp window says low. Propane is on.If the heater is connected to the line side of the circuit it will be powered at all times. In this situation, when the pump shuts down the heater will display a fault code of “LO”. If there is a call for heat and the pump then restarts there will be a 2-minute delay for the heater to fire. After the pump has been running for at

Press and hold the "Up" and "Down" buttons simultaneously, according to the Stanley Louis Company. Hold the buttons until the indicator light rapidly flashes and the digital display shows the maximum temperature-lock setting. Typically, this is in the range of 90-degrees F. Release both buttons. Select the desired water temperature with the ...

Audio turned out weird, so you may have to turn the volume up!How to diagnose and repair your Hayward H Series (H250) Gas pool heater. Audio turned out weird, so you may have to turn the volume up ...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...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...Aug 8, 2018 · Hi all. 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). Jul 5, 2016 ... Wired a Hayward pool heater, propane, trips every few hours ... pool heater tripping ... He says nameplate is 12 amps so did you put a amp meter on ...Jun 7, 2020 ... Diagnosis of common problems on a Hayward pool heater.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. The Hayward Universal H-Series gas heater meets or exceeds the South Coast Air Quality Management District's (SCAQMD) Low ...The hayward pool heater if code indicates a fault in the ignition system or flame sensing. Understanding the if code, its meaning, and how to diagnose it is crucial in ensuring your …Hayward Pool Heater Parts. Save yourself the expense of replacing your Hayward pool heater and repair it with the right parts. When pool repair professionals, maintenance companies and homeowners need Hayward pool heater parts, they rely on our team at Parts4Heating to deliver their parts on-time and up to specification.

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Set both the pool and spa desired temperature on the heat pump before turning on the remote. Once the remote is calling for pool or spa you will not be able to change the function on the heat pump without turning the remote off. Use Terminals 1 and 2 for 2 wire remote connection. Use Terminals 3,4,& 5.Lo indicates that the water level is low in the spa and as part of the safety features it goes into auto shutdown. Ask Your Own Pool and Spa Question. poolguy810. …Borde mer LBV is a 6.4 mile (15,000-step) route located near Libreville, Estuaire Province, Gabon. This route has an elevation gain of about 206.6 ft and is rated as medium. Find the best walking trails near you in Pacer App.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 …Pump is running, water is flowing through heater, heater plugged in, gas on. Service panel says Lo and "service". I've tried switching mode to pool with a heat setting of 80F …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.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 ...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: Platform: Square: Pool Type: In Ground: Product Dimensions: 44 " x 30.5 " x 33.6 "Product Height: 44 in: Product Length: 33.6 in: Product Weight: 280 lb:The heat exchanger may be leaking because: (1) Chemical imbalance. (2) Sanitizer damage. (3) Winter freeze damage. (4) Failed joints. Regardless of the reason, a Hayward service company must be contacted to inspect the failed exchanger. Contact an Authorized Hayward Dealer/technician for examination.Hayward H350FDP Manuals. Manuals and User Guides for Hayward H350FDP. We have 5 Hayward H350FDP manuals available for free PDF download: Troubleshooting Manual, Service & Installation Manual, Owner's Manual.If closed, LO code is Swimming Pool Heater Hayward H150FD Owner's Manual. Troubleshooting chart for Hayward Universal H-Series millivolt pool heaters, with SCREW 1 TURN CLOCKWISE, TO SEE IF LO ERROR CODE CLEARS. Our system has returned the following pages from the Hayward H-Series data we hayward h ….

The Hayward pool salt cell has the same format as the heater. click the year range and search your pool salt cell serial number. August 2015 to Present Format: 21 13 - 18 12 - 003816437HeatPro 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.All AquaCal heaters represented within this manual are designed to operate successfully at flow rates of 30-to-70 gallons-per-minute (GPM). Design the plumbing system to maintain at least 50-GPM flow through the heater under worst case conditions (i.e.: filter fouled to 10 psi rise); the heat pump will not operate correctly, norHeatPro In Ground Heat Pump, 140,000 BTUs, Square Platform. Hayward has an advanced lineup of gas heat and electric heat and heat+chill solutions to deliver the ultimate control of your water temperature.According to the Hayward Heater Manuel: 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, and the filters are clean. Replace defective switches.Residential Atmospheric Pool Heaters. Atmosheric heaters are the most common type of pool heater in the Raypak and Jandy Lines. Most Pentair & Hayward heaters come standard as Low NOx. Low NOx is required for 5 counties in Southern California only, and for all commercial heaters in Texas only. Atmospheric Pool Heaters.🤷‍♂️ Who we recommend this heater for:. The Hayward H-Series natural gas heater isn't dependent on temperature conditions, so even if you want to swim when it is chilly (e.g. temperature drops below 50°F), it won't be a problem.. If you don't want to wait a long time to swim in the pool, the Hayward heater will be perfect. It is the quickest heater among those on our list.FAQ: What are the Hayward pool heater lockout settings? The maximum lockout settings for the pool mode are 90ºF and 104ºF for the Spa mode by default.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. The Hayward Universal H-Series gas heater meets or exceeds the South Coast Air Quality Management District's (SCAQMD) Low ... Hayward pool heater says lo, 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., Hayward Heater LO code. Thread starter joeg679; Start date Jul 19, 2023; Jump to latest ... my last one's motor gave out) and as the title says for a couple months, I've been experiencing the pump not fully priming, the filter reads at 0 PSI, there is fairly low suction and return pressure, and I sometimes see air bubbles in the pool ..., We have a 30,000 gallon salt pool with a Hayward model H400FDN pool heater. The water turns green and the vinyl liner and fiberglass stairs get badly stained. I'm told by 2 pool companies that the hea …, Heat Pump 112K Ts2 Tihx Item # HP21003T is the heater - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them., Steps to Properly Shut Down Your Pool Heater. Step 1: Turn off the power supply to the heater. Step 2: Disconnect the gas supply to the heater. Step 3: Turn off the pool pump and wait for the water to cool. Step 4: Open the heater's drain valve and drain the water from the system., Hayward H400FDN Pdf User Manuals. View online or download Hayward H400FDN Owner's Manual, Troubleshooting Manual ... LO" Code. 46. Pressure Switch Adjustment. 49. IF" Code. 52. AC" Code. 57. AO" Code. 58. ... Brand: Hayward | Category: Swimming Pool Heater | Size: 1.88 MB Table of Contents. Table of Contents. 2 ..., Hayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience. ... Determine your pool heating requirements and heater size for your pool. Learn More. NEWSPLASH. Be the first to know. Email [email protected] to get notified. Learn More. CONTACT US. Telephone: +1 (480 ..., 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., The heat exchanger may be leaking because: (1) Chemical imbalance. (2) Sanitizer damage. (3) Winter freeze damage. (4) Failed joints. Regardless of the reason, a Hayward service company must be contacted to inspect the failed exchanger. Contact an Authorized Hayward Dealer/technician for examination., Lo-Nox. Before purchasing a heater, a pool owner should become more acquainted with their state health and safety codes. Lo-Nox heaters are a more environmentally safe way to heat your pool. ... Barreling Ahead with Another says: February 12, 2021 at 10:34 AM. ... I am looking to replace our heater. We had a …, Sep 1, 2011. #7. Yes, that's correct. It allows you to set two different temperature settings for systems that switch between a spa and a pool. For those systems, there should also be another connection or component (such as a flow switch or In-house electronic control system) that tells the heat pump which mode to go to., Find helpful customer reviews and review ratings for Hayward H400FDN Universal H-Series 400,000 BTU Pool and Spa Heater, Natural Gas, Low Nox at Amazon.com. Read honest and unbiased product reviews from our users., Mark shows us in this video how to do troubleshooting for a heater, he walks us through all of the steps. For all the pool knowledge you're looking for, chec..., Table of Contents How the Heat Pump Works & Specifications Pg. 4-5 Replacement Parts & 4.8k ohm Chart Pg. 6-7 Display Functions and Descriptions Pg. 8 How To: Pg. 9-15 Toggle ON/OFF and Mode & Lock/Unlock Heat Pump 10-11 Set Pool Temperature & Set Clock 12-14 Set Timer ON/OFF &... Page 4: How The Heat Pump Works & Specifications, 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..., 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., Hayward H350FDN Pdf User Manuals. View online or download Hayward H350FDN Owner's Manual, Troubleshooting Manual ... LO" Code. 46. Pressure Switch Adjustment. 49. IF" Code. 52. AC" Code. 57. AO" Code. 58. ... Brand: Hayward | Category: Swimming Pool Heater | Size: 1.88 MB Table of Contents. Table of Contents. 2 ..., 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., Long time lurker, first time poster. I had a brand spanking new H500fd heater installed this past fall by the local pool company. They wouldn't touch the electric or gas so it just sat in the pool equipment room all winter waiting for the weather to turn nicer. I few weeks ago I got the electric wired and the gas plumbed. This heater has never ..., 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., Jun 13, 2022 ... Got a heated pool? This Hayward HeatPro heat pump pool heater stopped ... Hayward Pool Heater LO Code? Watch This!! Touched By The Sun Pools ..., 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., Compare the 5 top natural gas pool heaters features, reviews and costs. ... Hayward Universal H-Series 150,000 BTU Pool and Spa Heater, Natural Gas: 4.1: Very good : Excellent : Good:, When water pressure increases the "Lo" sign goes away but I can't get the mode to switch to pool. ... I have a Hayward H400 NG pool heater about 6yrs old. ... Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com., HU-429948972. 3 years ago. Hi I just hooked up a new 150,000 Hayward. With pump on low speed I get the LO code. So I put on high speed and LO code immediately goes away but then within 30 seconds I get HS code and shut down. 724-977-7371. Like., Residential Atmospheric Pool Heaters. Atmosheric heaters are the most common type of pool heater in the Raypak and Jandy Lines. Most Pentair & Hayward heaters come standard as Low NOx. Low NOx is required for 5 counties in Southern California only, and for all commercial heaters in Texas only. Atmospheric Pool Heaters., Pool heater question. This is a raypak pool heater manifold. Have a water sw open code. Where's the switch. There two sets of wires running to probes. Ones a thermometer and the other is this little brass plug with two terminals coming off it. I've removed it and it's not a switch. Thoughts ?, Set both the pool and spa desired temperature on the heat pump before turning on the remote. Once the remote is calling for pool or spa you will not be able to change the function on the heat pump without turning the remote off. Use Terminals 1 and 2 for 2 wire remote connection. Use Terminals 3,4,& 5., Additionally, if you have a variable speed pump, turn it to max to see if that fixes it. Cleaning the pool, emptying the strainer basket at pump, etc; ensuring that the pump can circulate is really important, recommended clearing any debris from pool as well. Hope it works out and you enjoy the pool season., Add to Cart. Wishlist. Compare. Hayward W3H250FDP H Series 250K BTU Propane Pool Heater. $3,179.00. 0 reviews. 250K BTU Propane (LP) For In-Ground Pools and Spas. Cupro Nickel Exchanger., If the Flowsensor persistently detects a No Flow state the system may need to be inspected and maintained by a Hayward Authorized Servicer . The Flowsensor detects water flow from the filter pump in a Body Of Water. It is unsafe to run water treatment features, such as heating, Chlorination, or pH adjustments while there is no water flow., Low and High Salt Alarms can be observed when the salt in parts per million is outside of the expected range in a Body Of Water. Salt Chlorination takes place while the Salt Level is between 2400 and 3800 ppm . A Low Salt Alarm is generated when the Salt ppm is between 2400 and 2700 ppm for Standard. For Low Salt Monitoring it is between 800 ..., I have a Hayward pool heater and the heater is not heating up the water.. the technician came in and replaced the heat exchanger. ... heater plugged in, gas on. Service panel says Lo and "service". ... My hayward H250FDN pool heater runs for about a minute then the code comes up LO. I had a technician out and he checked all the safetys and ...