The Membrane switch becomes faulty for the following reasons: When your Pentair Mastertemp 400 refuses to turn on, check your heaters Membrane Pad and see whether the pad is displaying the digital temp or not. The pump basket blockage or clogged filter causes water flow resistance. Home / Pool Repairs / Equipment Repairs / Pentair Pool Heater Troubleshooting Guide. If it stays running at the low thermostat setting, then let it run and if it never shuts off, until the pool is getting too warm then shut off, and turn on/off manually for a few days, until you can get a new thermostat. I only own a pool. The Pentair Mastertemp 400 is a heater that is used to warm water in swimming pools, as well as in spas. Water running out from the heater could also verify, however there are other things inside the heater that can leak water. Malfunctioning Blower 9. Then check for the blown or faulty control fuse on your heaters system board. Power is not going on the ignition module. To see if the thermal regulator opens, submerge it in water. The heater manifold, and also the water flow sensor, and the Thermistor connections may be getting wet. Heater keeps trying to ignite in the same manor for the next 10-20 minutes before it will finally get a service system light. Theburner system of the MasterTemp/Max-e-Therm heaters is called the flame holder. Follow the actions outlined below to replace it. Kindly help. Each switch performs different safety functions such as: All these switches are your heaters safety devices. Step 4: Take the switch cover off. Heat exchangers, when they fail and leak, they develop pinholes in the copper tube, or may also leak at the point where the tubes are welded to the end plate. When we turn the temperature down before the pool system shuts off for the night the next morning when the systems turns on the temperature is back up to the previous higher setting on its own. Also, your heater displays the error code ERR IGN. And the exchanger out of the flue discharges the exhaust gas. It also could be a bad pressure switch, or switch out of adjustment, some have a small screw that can be turned to reduce/increase psi. A thermostatically activated valve is the thermal regulator. The 2nd is after modified the 3-port valve to the return lines. They have a have an SF code for Sensor Failure. Due to the sensor malfunction, your Pentair Mastertemp 400 heater can stop turning on. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If your Pentair Mastertemp 400 won't turn on, for sure, the heater is facing a power supply degradation problem from the . Step 2: If the heater is below the pools water level, close the isolation valves to prevent the pool from draining. Defective Membrane Switch 8. It means your stack flue sensor has tripped. You will need to reset your heater to get it out of the lockout. Other reasons why the heater is not turning on include: Faulty igniter The defective ignition control module Bad control fuse If the sensor resistance is below this range, you should replace your Pentair heaters Stack Flue Sensor. Full-text digital display combines new functions and a user-friendly menu for easy operation and diagnostics. If the blower is working properly, you may have a faulty air flow switch. Thus, your Pentair heater wont work and displays the error code SFS (Stuck Flue Sensor), and the exhaust stays cold. Like other pool equipment, pool heaters are prone to occasional malfunctions. Dont stress! Some filters need back-washing. Whenever he finds the perfect solutions to any issues of heating appliances after doing in-depth research, he loves to share them with his readers. So, keep reading till the end. It doesnt sound like the heater is even trying to kick on. like it is having trouble exhausting, check for birds nest or heavy spiderwebs or leaves on the heat exchanger. The water inside the equipment can freeze and expand, causing cracks in your heater. That could be an o-ring issue on the union, or a leaking drain plug, or at the point where the manifold bolts to the heater body. Noise 13. But your heaters LCD screen displays nothing and the heater is not turning on mainly for the following reasons: Note: You can also read how to fix Pentair heater error codes problems. The thermal regulator should be in fine working condition. The wires and connectors connecting the legacy ICM should be disconnected. Hi Lance, those are good ideas, first lets think about flow rate. Pentair Heat Exchanger Troubleshooting: . Fireplacehubs.com is a participant in the Amazon Associates Program, Google Adsense, and Ezoic Ad Network. Your heater light may be blinking because of a failed ICM. Whenever he finds the perfect solutions to any issues of heating appliances after doing in-depth research, he loves to share them with his readers. We are always here to help you. Then replace the faulty ICM. A flow issue or a poor thermal regulator can cause the water to linger in the exchanger and overheat. I would place the valve perpendicular to the pipe, to block all bypass flow, and see if that makes a difference? The solution to your heater issue is given in your previous comment. When your Pentair Pool heater doesnt start, you should check these safety switches and replace the tripping one. Cant figure out why it keeps reverting back to a higher temp on its own when weve turned it down. If the filter isnt the issue, a faulty safety switch is next to check. The LED on the back panel indicated HLS. I think its a bit on the high side. No code is present. A clogged filter or pump basket can build resistance to water flow to a degree that your heater cant operate as usual. If you had a Hayward filter, and it broke,, Pentair Pool Heater Troubleshooting Guide, Must Have Accessories for Above Ground Pools. Replace the defective parts. If it fires off everything works fine a few minutes then shuts off.Ideas?Filter is clean. $294.34. However, your heater will show the exhaust temp. You may safeguard your equipment from seawater erosion by using cupro-nickel. This error code should not be shown on your Pentair heater at this point. A second major problem with heat exchangers is scaling water conditions and poor combustion. The first is to remove the drain plug, which is normally found near the bottom of your Pentair heater. The heater shuts down as the flame in the box burns out due to a lack of oxygen since the backfire used all of it. Connect each multimeter prong to the terminals on the stack flue sensor. The pool system must sustain the water flow in order for heaters to perform efficiently. So be careful while tasting the transformers voltage. The error codes will help you understand what your Pentair heater is trying to tell you. Error Code E05: Stack Flue Sensor Is Open 2. #476223 Pentair MasterTemp 400 Pool Heater, Ignition Module. I just didnt trust them anymore. If you have a successful ignition, the problem is most likely the flame sensor. We have a new Pentair Mastertemp 400. More about us. Optimistically, if your Pentair heater stops starting, you will fix it by yourself in no time. The four bolts on the heating jackets must be removed. William is the founder of Fireplacehubs.com. Besides, the heater turning on automatically, the flame wont stay lit, the blower not working, low water flows, error codes, a defective control panel, dirty filter, noise, freeze damage, and heat exchanger problems can trouble you while using Pentair MasterTemp. When this happens, the front panel buttons will stop working. The water circulating through the copper heat exchanger tubes absorbs the heat, and exits the heater a few degrees warmer than when it entered. www.pentairpool.com. Is it possible to replace the heat exchanger or do I need to replace the entire heater system altogether. Note: You can also read how to fix Pentair MasterTemp 400 common problems. And 290-350 is the normal temperature range. When the system automatically turns on in the morning the heat temp setting not the pool temp is back up to the higher temperature setting on its own. This could be a sign of a faulty flame sensor. Its a fun combination of plumbing, wiring and gas. We and our partners use cookies to Store and/or access information on a device. See page 16 and verify the gas regulator is -0.2 wc. I have a MasterTemp 200. So Im very happy. Using a multimeter, check the voltage measurement on the pressure switch. Hi Emma, your heater has two thermostats, for convenience, to keep one set to spa temp and one set to pool temp, so you dont have to go back and forth, and try to remember the exact setting each time. Then checks the continuity across the sensor. Incorrectly Set Temperature Control 2. Now, we make a living selling to DIY people, who like to save money. Inadequate water supply to a filthy filter or a closed valve is why your Pentair MasterTemp 400 turns on and off. It cycles for a bit then I hear a click either it fires off or it doesnt. Check your igniter module. Low Gas Pressure 4. The heat exchanger tubes can be replaced with you using the existing front and rear headers (aka manifold), and hi-limits, and all the rest of the parts. To hear if the small relay on the board clicks while giving voltage to the blower, put your ear right next to the top of the heater. Quantity: Save my name, email, and website in this browser for the next time I comment. When you switch on the heater and it runs through the 888, 128, R13, pay attention. Where is the thermal regulator on a Pentair Pool heater? The ignitor is connected to the Molex connector with wires. I let it run and the temp slowly went up from 74 to 77 in just an hour without stopping. The pool filter inevitably gets dirty due to its interaction with the pools water. All you have to do now is double-check the burner. Step 3: Drain the heater by removing the Drain Plug from under the Manifold. Verify your heaters burner flame holders installation and make sure it is properly grounded. I shouldve tried harder to learn how the pool works. Labor costs are projected to be between $57 and $71 per hour, with parts costing between $235 and $327 per hour. Manage Settings Replace ignition or control module. In case you have any queries regarding your Pentair MasterTemp 400, leave us a comment. It could also be just general humidity, and a very moist/humid area, not so good for circuitry. Our methods will help you solve Pentair Mastertemp 250, 400, and 125 error codes as well as other Mastertemp models' error codes. The wiring diagram is given below for your reference. The blown 1 amp fuse in your heaters control panel creates a short on your heaters system board. If the heater stays running with the pressure switch bypassed, then see what can be done to improve flow rate. I then reconnected the terminal on the new terminstor and got 75 (I guess thats the water temp). Also, the sparking igniters working condition becomes vulnerable. The sensor is operating if the resistance is 3.5 ohm or above. Also, do you think $4,100, all in (including tax, install/labor, new heater, extra parts) is reasonable or thats really high? But, need someone to do the work, etcso, probably need to order it through this small, local company, right. Pentair MasterTemp 400 heating light flashing is caused when the heater is calling for heat but not igniting. Greetings Mr. Merino I opened pool 2 weeks ago, but only started heater last weekend. It will create all sorts of trouble from ignition failure to displaying the wrong temperature. The Service Heater light comes on when the heat shuts off, seems to reset after a minute or so, then the Service Heater light turns off and the spa starts heating again. Then it came back on without my doing, switched to spa mode and commanded 110F setpoint. Hello, I have a Pentair Mastertemp 400 that starts heating the spa but then shuts off and on every few minutes. Remove the AGS Switch from the Manifold by unscrewing it. Rust or red spiders can clog these up. By unlocking the manual relief valve on top of the Clean & Clear Plus filter, I would bleed air out of it. Pentair Mastertemp 400 Won't Turn On [10 Troubleshooting Tips] 1. Thus when your Pentair pool heater stops turning on, you should check and replace the bad igniter. Defective Control Panel 11. If not, replace it. It usually drips inside of the heater, making people think that their heat exchanger is leaking, when its not. Alerts pushed to a smart device to keep you updated on heater performance and real-time status. Leaking heat exchangers are often confused with sweating or condensating heat exchangers. Tripping Safety Switches However, to fix the above troubles, follow the ways below: Replacing the faulty ICM is a must so that your Pentair Mastertemp 400 pool heater again turns on perfectly. The blower needs to be repaired or replaced in this situation. Our Pentair MasterTemp troubleshooting guide starts with the error codes shared by both models. It is old and a bit rusty and loud. David is a man who loves doing research and finding out the best solution to any type of heating appliance issues like heaters and fireplaces. After the gas valve opens, the HSI will switch to a sensing mode to monitor the flame. Replace or Repair your Swimming Pool Filter? Remove the wiring connection. Also, disconnect the legacy ICMs wires and connectors. How do you test an ignition control module? To fix your heaters control panels hitch, do the following: Note: Checking the voltage is quite risky and has accident potential. Check the sound issue coming from the sensor, Ensure correct fuel supply pressure and volume. Replace in case necessary. If not, be sure the faulty Membrane switch is the culprit. If the pump is running, its likely that the filter and/or skimmers need to be cleansed. Your heater stops working or blowing when a lower volt or no volt comes to the control panel out of the transformer. Now disconnect the previous ICM unit on your pool heater. Here are the video links. Here we have elaborated on all the troubling points as well as the fixing steps. Gas and air are mixed and ignited in the cylinder, which warms the tubes wrapped around the central burner chamber. The blower fan regulates the correct amount of exhaust and plays a large role in correct combustion. Check to see if anything is stuck on the stove. Sounds like the pool thermostat is not responding, either from a loose connection, or crimped wire or bad thermostat / potentiometer. Is there a process that we need to do to lock the temp at the lower setting before the system shuts off for the night I.e., when we lower the temp do we need to touch the select button? You need to take apart the filter cover and get the elements out. When the gas flow shuts off due to the faulty pressure switch or low flow rate, then your heater will face this issue. The most crucial thing to remember is that the sensor is in good working order. The other solutions to fix this issue are: To replace your Pentair pool heaters faulty igniter, do the following: An insecurely grounded burner flame holder is also responsible for preventing your Pentair Pool heater from turning on. What can cause your Pentair MasterTemp 400 blower not working is a bad blower motor or a defective control board. Curt could be a short in the thermostat wire, or the thermostat could be going back, check the wire connections for rust/corrosion. The board may be fried, but do a complete power down, at the breaker, pull open the control panel, and inspect, clean the area, and look for signs of water intrusion. Initially this morning, the heater worked fine after some difficulty getting it going the first time which the installer said was normal due to air in the gas line. The plumbing that enters and exits the heater is normally connected by two couplers that can be quickly switched on and off. . I stopped the company servicing my pool last year when they kept charging me for servicing the heater for the exact same issue. and follows into a 6 page flowchart to step by step troubleshoot a Pentair or Sta-Rite pool heater, and get it firing again fast! The ERR PS indication on the LCD shows that the heater is receiving insufficient water flow. After about 20 seconds, it tries to ignite. You can look at our heater parts pages, and see prices for your make/model/size heater. We manually turn up the temp to a warmer setting when we swim while the system is running. Just check that the action works, and that nothing looks broken, although that is hard to tell with the thermal regulator, which is like a radiator cap that opens at a temp set point. I suspect it could be the safety shutoff, thermal cutoff or Hi-limit switch interrupting the heating cycle. A defective AGS switch can cause ignition failure. The sealed heat exchanger surrounds the burner flame holder. Pentair MasterTemp Electrical Troubleshooting: . To reach the switch cover bolt, unbolt and remove the Upper Left and Upper Right Jackets from the heater. The thermal regulator should be in fine working condition. Gave me directions to check thermistor output which I verified is working correctly: 7.7K ohms for 89 degree water. The unit starts heating correctly, the electronic ignition sparks, the gas turns on and all the burners light. The controls and circuit boards for the Max-E-Therm and the MasterTemp are fairly identical. Step 2: Disconnect the system from the Max-E-Therm heater. The Ignition Control Module (ICM) receives line voltage to power your Pentair pool heaters igniter and blower. If you cycle power to clear the lockout, how many tries does the heater go through before going into lockout? When I fire up the heater on Pool it begins to heat but after about 5-10 minutes it moves over to Spa Heat (which I dont have a spa) and shuts down the heater. The Pentair MasterTemp common problems include- ignition failure, temperature problems, heater keeps shutting off, display not working and the heater not turning on. Now reassemble the filter, put its cover, and turn on your heater. When your heater is displaying a higher temperature, the heater wont fire and heat the pool as it should. So when it goes bad, your pool heater will not start. Pentair Mastertemp 400 Wont Turn On [10 Troubleshooting Tips], 2. The reading should be 50-500 Ohm at room temperature. Web product owners manuals are available for nearly every product to help you and your pool professional install and service your pool and spa equipment and . You may need to replace it. Another typical cause of a Pentair heater ignition lockout is a faulty igniter. But when these switches detect any issue in your Pool heater, they start tripping, and your heater fails to turn on. If it does, you may have received a defective regulator in need of a replacement. Step 2: Disconnect the system from the Max-E-Therm heater. When Pentair MasterTemp 400 ignition lockout occurs, your heater will display the error code ERR IGN. Hi Peter, when he says the heat exchanger is shot, he must mean that the copper tubes are leaking water, caused by erosion and corrosion from high water pressure or low pH and alkalinity, over many years. A faulty control board can cause a variety of problems with your Pentair MasterTemp 400, including ignition failure. Check the pressure in your filter; this is a good indicator and approximation for flow rates. Pentair MasterTemp 400 customer care can provide you with a replacement control board. Look for any evidence of cracking on the flame sensor porcelain. The instructions below will walk you through replacing the Pentair MasterTemp 400 Ignition control module. Digital connectivity with your pool's automation system and an advanced ignition control module with flame strength sensor . Thanks for the help. Also could possibly have circuit board problems. I have a Pentair 400 master temp. Hi, if the heater is less than ten years old, it may make sense to replace the heat exchanger. 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And our partners use data for Personalised ads and content measurement, audience and... And heat the pool as it should old, it may make sense to replace bad. Safeguard your equipment from seawater erosion by using cupro-nickel ignited in the exchanger overheat... Sorts of trouble from ignition failure to displaying the wrong temperature heat but not igniting correctly, the gas on. An SF code for sensor failure previous ICM unit on your heaters board. Without my doing, switched to spa mode and commanded 110F setpoint, which is normally found the! Connectivity with your Pentair MasterTemp 400, leave us a comment: note: you can also read to! A flow issue or a closed valve is why your Pentair pool?... Pressure switch or low flow rate we swim while the system from the heater go through before into! Level, close the isolation valves to prevent the pool system must sustain the flow! Check these safety switches and replace the bad igniter we manually turn up the slowly. 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