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Oct 29, 2021 · 1. Check the Water Flow. The most common issue is when the heater stops functioning. This is when you check on the water flow lamp. Generally, when a pool heater detects a shortage of water, it shuts down automatically to prevent overheating and damage to the heater. If this is the case, watch for the display light on the heater.

Pool heater says lo. Oct 18, 2020 ... was getting CE code, aka Communication Error. Replaced main board, display board, and display panel.

This instruction manual provides operating instructions, installation and service information for the MiniMax NT Low NOx high performance heater. The information in this manual applies to the MiniMax NT Low NOx 200, 250, 300, and 400 natural gas models.

May 10, 2022 · 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. How to reset Hayward pool heater? You can reset your pool heater lockout mode by using the keypad and changing the settings. You can change between the “Pool” and “Spa” modes by using the ... We picked the Pentair MasterTemp 125 Low NOx gas pool heater as the best natural gas pool heater because of its price, warranty and heating capacity. The Pentair MasterTemp 125 Low NOx will likely ...PoolSync ® Manual. AquaCal ® has been the leading swimming pool heat pump manufacturer since 1981, offering a full range of units to meet any heating need. AquaCal ® can maintain anything from small above ground pools up to very large commercial facilities. The chillers, as well as the heat and cool units, can be used to create cold plunge ...The MiniMax NT Low NOx is a compact, lightweight, efficient, induced-draft, gas fired high performance pool and spa heater that can be directly connected to schedule 40 PVC pipe. The MiniMax NT Low NOx, also comes equipped with the Pentair multifunction temperature controller 7800 which shows, at a glance, the proper functioning of the heater.Common challenges associated with pool heaters failing to start can be attributed to a range of issues. For heat pumps, problems may arise from clogged filters, low refrigerant levels, or electrical malfunctions. On the other hand, gas heaters may encounter issues with pilot lights, gas supply, or ignition systems.

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. ... Jay Shah says: August 31, 2021 at 3:48 PM. Hello, Trying to decide between a 400k btu cupro nickel heat exchanger natural gas …By: Olin Wade (Remodel or Move Stuff) When the pool heater says ‘service’, it means that it is not functioning properly and requires some maintenance. This could be due to a malfunctioning part or inadequate fuel levels. It is important to identify and address the issue as soon as possible to ensure that your pool remains heated to its ...If you’re looking for a car in Los Angeles, Echo Park should be at the top of your list. This vibrant neighborhood boasts an impressive selection of cars for sale, as well as exper...Heaters are expensive pieces of equipment and sometimes the pool owner can do more harm than good. A good rule is, when in doubt- give Pentair’s technical support a call. They will troubleshoot the heater with you over the phone and help come up with viable solutions.Pool heat pump pool heater troubleshooting guide. Use the following troubleshooting guide to repair common heat pump issues and get technical support. Call Us Nationwide: 1-800-741-9956. West: 213-291-9276 Southwest: 214-764-8551 Midwest: 312-229-0026 Northeast: 631-223-7175 Southeast: 239-247-5878 or 954-866-1644. Trustpilot.Heat pump troubleshooting guide for Pentair pool heaters. Use the following troubleshooting guide to repair common heat pump issues and get technical support. Call Us Nationwide: 1-800-741-9956. West: 213-291-9276 Southwest: 214-764-8551 Midwest: 312-229-0026 Northeast: 631-223-7175 Southeast: 239-247-5878 or 954-866-1644. …Why does my pool heater say no flow? Usually, the pool heater says no flow, which means that debris or dirt causes it to clog. Another reason is that the water level is low and blocks the basket due to dirt. A Must-Read: Best Pool Accessories. You will learn that a clogged filter and impeller results in poor water flow as you read on.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.

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 resolve it.Brilliantly Made with You in Mind. The sleek and stylish Raypak Digital Gas Pool and Spa Heater features innovative technology designed to keep your pool or spa at the perfect temperature for your enjoyment. Built to withstand various weather conditions, this modern pool and spa heater is the perfect solution for environments requiring ...The Heater Shuts Off Unexpectedly: Ventilation: Ensure that the heater’s exhaust vents are not blocked. Poor ventilation can cause the heater to overheat and shut off. Water Flow: A blockage or obstruction in the pool’s circulation system can reduce water flow to the heater. Check and clean the pool’s skimmer baskets and filters ...Sep 10, 2023 · To fix low flow on your pool heater, follow these steps: 1. Check the filter: make sure the filter is clean and not clogged with debris, as this can restrict water flow. 2. Inspect the pump: verify that the pump is functioning properly and is set to the correct speed. Troubleshooting Guide for Rheem Heat Pumps. For technical support, call 1-877-720-2076. XI. Troubleshooting. If your heat pump does not operate, or simply does not heat your pool water, the indicator lamps on the front control panel (see Section IV) can provide valuable clues as to what is wrong, and may even indicate precisely what the problem ...September 10, 2023 by Sayed Sayeedur Rahman. To service the heater light on a pentair mastertemp, follow these steps: check the power supply, inspect the igniter and flame sensor, clean or replace any faulty parts, and reset the system if needed. These actions will ensure the heater light is functioning properly and heating the water ...

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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, norAdvertisement Most human beings much prefer a warm meal to a cold one, especially if they're in cold or wet conditions. Eating cold spaghetti or cold beef stew is definitely no fun...By: Olin Wade (Remodel or Move Stuff) When the pool heater says ‘service’, it means that it is not functioning properly and requires some maintenance. This could be due to a malfunctioning part or inadequate fuel levels. It is important to identify and address the issue as soon as possible to ensure that your pool remains heated to its ...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 .

There are several things you can do to troubleshoot a pentair pool heater that is not igniting: 1. Check the gas supply: make sure there is enough gas in the tank and that the valve is fully open. 2. Check the igniter: make sure the igniter is clean and free of debris, and test it to see if it is working properly. 3.A car’s heater does not generate heat if the coolant level is low or restricted by buildup, if the water pump failed or if the thermostat is broken. The heater fan is also sometime...April 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 ...Solar 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 ...Water heaters raise the temperature of water for use in bathing, cooking, irrigation, industry and other hot-water applications. Here’s how the three basic types of water heaters w...Before you go shopping for a new water heater, you must do your homework. There are numerous factors to consider when selecting the best water heater. Such factors include your per...To turn heater on: Press & release the set button four times until “Off” appears. Press down button twice then “No” appears. Heater is now on. Pool & Spa lights will illuminate beside display indicating heater is on. Use the up or down arrows to set desired temperature.Heater reads “OFF” on the control board when any button is pressed.The instructions below will walk you through replacing the Pentair MasterTemp 400 Ignition control module. Step 1: Take off the left side panel of the heater. Step 2: Disconnect the system from the Max-E-Therm heater. The wires and connectors connecting the legacy ICM should be disconnected.Feb 15, 2024 · We picked the Pentair MasterTemp 125 Low NOx gas pool heater as the best natural gas pool heater because of its price, warranty and heating capacity. The Pentair MasterTemp 125 Low NOx will likely ... Pool heaters can be the most baffling piece of pool equipment, but if you consider the proper flow of gas, water and electric, you’re sure to find a solution quickly! Troubleshooting pool heaters is a methodical process, or a process of elimination. First eliminate water flow issues, then gas flow issues, and finally the low voltage electric ...

Troubleshooting Guide for Rheem Heat Pumps. For technical support, call 1-877-720-2076. XI. Troubleshooting. If your heat pump does not operate, or simply does not heat your pool water, the indicator lamps on the front control panel (see Section IV) can provide valuable clues as to what is wrong, and may even indicate precisely what the problem ...

Feb 2, 2023 · 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. Checking And Cleaning The Water Flow Path: Verify water level: Ensure that the pool water level is at the appropriate mark. Low water levels can cause the heater to overheat and trigger the h5 code. Inspect the skimmer and pump basket: Remove any debris that has accumulated in the skimmer or pump basket.A car’s heater does not generate heat if the coolant level is low or restricted by buildup, if the water pump failed or if the thermostat is broken. The heater fan is also sometime...To adjust the pressure switch rotate the star gear clockwise to raise the setting (ie. The heater is below pool level) or counterclockwise to lower the setting (ie. The heater is above the pool. If the heater is more than 5 feet above or 4 feet below your pool water level the pressure switch will not function properly.This could be due to low gas pressure, inadequate air supply, or improper venting. Make sure gas is turned on; and for propane, make sure the tank has fuel. Also check for water run-off from roof or sprinklers that may be flooding the heater. Check to make sure the heater pilot tubing is intact and not clogged.The Sta-Rite ignition control module replacement process is given below. To access the ICM, your heater’s left side panel needs to be removed. Take a picture of the wire connections to the ICM to remember where each wire goes. Disconnect the wires connecting the ICM to the Max-E-Therm heater.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 …Learn how to troubleshoot and fix the Jandy JXI check flow issue from other pool owners who faced the same problem.May 18, 2022 · 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. Best Jandy Pro Series JXI Propane Pool Heater JXI400P Buy Online. Product Features Energy-efficient - 83% thermal efficiency rating and low-NOx design surpasses strict DOE energy efficiency requirements Copper fin heat exchanger tubes for efficient heat transfer Single stainless steel burner with a robust design.

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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 …Swimming Pool Heater Hayward H250FD Owner's Manual. Pool and spa/hot tub heaters (16 pages) Heater Hayward H250FDN Service & Installation Manual ... 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. Inspect water pressure switch Continuity test …Solar 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 ...Troubleshooting Guide For Pentair Pool Heat Pumps. Pentair Technical Support: 800-831-7133. WARNING RISK OF ELECTRICAL SHOCK OR ELECTROCUTION. Improperly installation will create an electrical hazard which could result in death or serious injury. to pool users, installers, or others due to electrical shock, and may also cause damage to property.We picked the Pentair MasterTemp 125 Low NOx gas pool heater as the best natural gas pool heater because of its price, warranty and heating capacity. The Pentair MasterTemp 125 Low NOx will likely ...Aug 8, 2021 · NJ. 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 filter is clean and the output is strong. I ordered a new pressure switch, but in the meantime I took the two wires that connect to the switch and made a jumper ... Measure the air temperature difference (A (Delta)T). A (Delta) T is the temperature difference between the air entering your heat pump and the air exiting your heat pump. A (Delta) T should measure between 9° and 12°F (5° and 7°C). If it does, then your heat pump is operating normally, and your heating failure is most likely due to ... Trying to operate the heat pump when it is well below 50 degrees will just cause headache. Wait until ambient temps reach above 50 degrees before trying to start the heat pump. No power. Make the sure the breaker has not tripped. You may also have faulty wiring or a poor connection. Feb 14, 2015 · 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, nor You don’t need a fancy test meter to troubleshoot a pool heater. ELECTRONIC POOL HEATER TROUBLESHOOTING GUIDES. For our example heater, we will be using the Old Teledyne Laars Series I & Series II Spark Ignition heaters, made from 1986-1997; but the concepts apply to electronic heaters made by Raypak, …A pool heater is an essential component of any swimming pool, especially in areas where the weather can get chilly. If you own a Hayward pool heater and it breaks down, you need to...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. ….

Troubleshooting Guide for Rheem Heat Pumps. For technical support, call 1-877-720-2076. XI. Troubleshooting. If your heat pump does not operate, or simply does not heat your pool water, the indicator lamps on the front control panel (see Section IV) can provide valuable clues as to what is wrong, and may even indicate precisely what the problem ...To adjust the pressure switch rotate the star gear clockwise to raise the setting (ie. The heater is below pool level) or counterclockwise to lower the setting (ie. The heater is above the pool. If the heater is more than 5 feet above or 4 feet below your pool water level the pressure switch will not function properly.Image via YourPoolHQ. Possible cause: Thermostat Solution: If your thermostat isn’t set to a temperature higher enough than the temperature of the water, then it won’t signal the heater to turn on at all. Raise the thermostat to a temperature at least 5 degrees higher than water . Possible cause: Improper heater size Solution: Gas pool heaters are ideal …Mar 1, 2015. #1. We have a 2 1/2 year old SR400NA we use to heat our SPA. Last night the SPA would only heat to 94 degrees as reported by out Pentair Water Easy Touch controller. The water was lukewarm at best. I tried shutting off the breakers to all the pool equipment to see if that woul reset everything, but that did not help.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.Troubleshooting Guide for Rheem Heat Pumps. For technical support, call 1-877-720-2076. XI. Troubleshooting. If your heat pump does not operate, or simply does not heat your pool water, the indicator lamps on the front control panel (see Section IV) can provide valuable clues as to what is wrong, and may even indicate precisely what the problem ...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.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 ...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. Pool heater says lo, Feb 3, 2013 · 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 ... , 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., 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., 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., I recently bought a house with a in ground pool/hot tub combo that includes a Hayward H400 pool heater. It was a bank owned house where the pool had been sitting without filtering for probably 6 months. After getting everything cleaned up, having the system gone through, I fired it up and the..., Measure the air temperature difference (A (Delta)T). A (Delta) T is the temperature difference between the air entering your heat pump and the air exiting your heat pump. A (Delta) T should measure between 9° and 12°F (5° and 7°C). If it does, then your heat pump is operating normally, and your heating failure is most likely due to ..., 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. An open bypass is okay for the summer months because we don’t use the pool heater then., Most residential pools have one heater and it is referred to as “the pool heater” but can be used to heat either the pool or spa depending on which you select in the programming. So the term “pool heater” is a general term because it is most likely also the “spa heater.”, Pool noodles are one of the weirdest pool toys. They float, and that's about the only reason they're good for water games. Do yourself a favor and use them around the house instead..., There are several things you can do to troubleshoot a pentair pool heater that is not igniting: 1. Check the gas supply: make sure there is enough gas in the tank and that the valve is fully open. 2. Check the igniter: make sure the igniter is clean and free of debris, and test it to see if it is working properly. 3., It is perfectly normal operation to show the FLO code even while the heater is in the OFF position because the control panel and display are still operational. From the manual: All AquaCal heaters represented within this manual are designed to operate successfully at flow rates of 30-to-70 gallons-per-minute (GPM)., If you’re looking to purchase a new or used RAM truck in Los Angeles, you have plenty of options to choose from. RAM is known for producing high-quality and reliable trucks that ar..., The pentair mastertemp 400 service heater light on is a reliable and efficient heating solution for your pool or spa. With its advanced technology and user-friendly features, it ensures optimum performance and hassle-free maintenance. Keep your pool at the perfect temperature with this top-quality heater., 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 …, 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., A car’s heater does not generate heat if the coolant level is low or restricted by buildup, if the water pump failed or if the thermostat is broken. The heater fan is also sometime..., Members. 1. Posted February 4, 2009. Hello all Master Spa owners, We have a problem with our Master Spa. First of all we bought a house that had a Spa, no manual nothing. We used it for some time than the heater broke. There is no MasterSpa dealer here. We ordered a new heater and installed it now the LED says heater dry and shuts down the …, new heater. set temp to pool on 90. Heater turmed on then one minute later turned off says 79 on display. Water Temp 79. Wont turn back on to heat pool. Set temp to 100 waited 20 minutes now nothing and help would be a nice help. Tech support has been busy for some time now. Mark, All MasterTemp® 125 heaters are designed with a direct ignition device, HSI (hot-surface ignition), which eliminates the need for a standing pilot. The MasterTemp® 125 heater requires an external power source (120/240 VAC 60 Hz) to operate. SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference., , To troubleshoot the service heater light on your pentair mastertemp 400 pool heater, first, clean the filter and ensure there is no blockage in the venting system. Check the gas valve and gas supply for any issues. If the problem persists, contact …, Using a chlorine test strip, test the water around the heat pump. If it detects chlorine in the water, you’ve got a leak. If not, it’s just condensation. Whew. But not so fast: even if it is just condensation, chances are your heat pump has a clogged drain. Remove any debris and consider the job done., Show all. View and Download Raypak 406A installation and operation manual online. Gas-Fired Pool and Spa Heater, Bronze ASME and Polymer Atmospheric Heat Exchanger. 406A swimming pool heater pdf manual download. Also for: 266, 266a, 336a, 399, 206a, 336k, P-r336a-enx, P-r206a-en, P-r266a-ep,..., Using a submersible pump placed in the shallow end, attach one end of the tubing to it. This will allow it to pump out the pool water, injecting it into the coil. As it flows through the heated tubing, the water warms up. Place the other end of the coil in the pool so the warm water is emptied into it., May 26, 2011. #1. Hi everyone, I am hoping you can help me out! I have a Hayward H400 IDPL2 heater - when we opened this year I got an IF code so I cleaned out the nozzles and checked the gas levels. After no luck lighting - I replaced the ignitor. After I replaced the ignitor - I then got a CE code. So today I replaced the Display board and ..., 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., LEADING INNOVATIVE SOLUTIONS FOR POOL, SPA, COMMERCIAL HYDRONICS, AND WATER HEATING APPLICATIONS. LEARN VIDEO. RESIDENTIAL GAS POOL & SPA HEATERS. Industry First Heat Exchanger Technology. LEARN VIDEO. RESIDENTIAL POOL & SPA HEAT PUMPS. Smaller Footprint & Light Weight Design. LEARN VIDEO. …, 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 …, Turn off the electricity and gas going to the pool heater. Open the faceplate of the heater, then locate the pronged ignitor. Remove the retaining bracket and screws, then disconnect the ignitor from the motherboard’s wires. Contact the manufacturer for a like-for-like ignitor part number, then attach it to the motherboard’s wires., 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., Bring summer to your home pool the whole year round with Mr Pool Man’s collection of pool heaters (and chillers). Heating up to 40°C and cooling down to 8°C, shop for the best energy efficient and whisper quiet pool …, The Pentair MasterTemp Low NOx Pool Heater – 400k BTU (Natural Gas) provides energy-savings and advanced operating features that were only available from much larger heaters. With its revolutionary pre-mixed gas combustion technology, the MasterTemp 125 Heater offers 82% thermal efficiency, the highest in its class., To get to the root of such problems, you should: • Check the gas valve. To do so, remove the wire running between the gas valve and the thermostat. If the heater doesn’t shut off, you have a faulty valve …