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tankless water heater error codes

I'm a Licensed Home Inspector, Certified Master Inspector (CMI), an FHA 203k Consultant. If required, replace the tank thermistor. Repeated LC codes will eventually lockout the water heater. You may also need to restart the unit to fix this error code. In the case of an error code E515, the PCB, PCB’s monitoring device, igniter, fan, dual venturi, and the 3-way valve should all be inspected. All tankless water heaters will surprise you with an unexpected error code eventually. These tanks are built to last with warranties that exceed many from other manufacturers. Ensure there are no loose connections and the wiring is not damaged. 32: Outlet thermistor failure. Error code 031 (green LED flashes only once) To fix this error code, inspect the heating return thermistor’s condition and the pump wiring connectors. by Troy Koopman | Appliances, Plumbing Advice | 0 comments. 33: Heat exchanger thermistor failure. Switch it off the unit and inspect the condition of the APS. Get tips for resolving issues on your own. To fix it, ensure that the sensor’s wiring is in good condition and working correctly and that the outdoor reset curve is dialed in properly. To troubleshoot and fix Navien error code E012, confirm that the main gas valve is open and the gas pressure is within spec. In Easy Maintenance Tips for Tankless Water Heaters w/Photos will outline how to perform tankless water heater flushing and other maintenance. Using Takagi error codes for troubleshooting Assumption: Takagi water heater was properly installed, per codes and manufacturer's recommendations. Clean the strainer and flush the heat exchanger if needed. Resolve your service issues online. I've been conducting home inspections since 2002. Abnormal input data. Turn off the cold supply, relieve the hot pressure and remove the filter to check for debris. Call … Bosch Tankless Water Heater Error Codes. When the error code appears on the Bosch heater's LCD display, the reset button sometimes leads to an error removal, but if it doesn't work, the instructions below might help troubleshoot the problem: Error code A2 - … 43: Invalid number, possibly mis-read for actual code 73. Ruud will be the premier customer experience provider of all water heating solutions. Check the high limit switch, the 3-way valve, and the PCB.eval(ez_write_tag([[300,250],'homeinspectioninsider_com-box-4','ezslot_4',159,'0','0'])); Navien error code E030 is caused by an overheating exhaust. Hubert Miles is compensated for referring traffic and business to these companies. To fix it, check the thermistor’s condition and wiring. To fix this error code, inspect the heating supply thermistor’s condition and the pump wiring connectors. Rheem tankless water heaters use a condensing technology to offer continuous hot water without the use of a large water tank. Navien error code E445 indicates an abnormality in the mixing valve. Sediment or lime build up on element(s). The water is heated on demand only, which reduces energy consumption as well as overall energy costs. In addition to that, you may also need to check the condition and wiring of the exhaust sensor, flame rod, and pressure sensor to ensure they are all in good condition. In some instances, the dual venturi may need to be fully replaced to fix this error code.eval(ez_write_tag([[300,250],'homeinspectioninsider_com-banner-1','ezslot_6',160,'0','0'])); Navien error code E109 indicates an error with the fan motor. See Noritz Tankless Water Heater Seven Common Error Codes & Repairs [PDF] 31: Inlet thermistor failure. Turn off, or remove circulation pumps (unit is not designed for continuous operation with circulation systems). An open or shorted sensor causes the Navien error code E432. Check if the flow switch is in the off or on position and the thermal block’s resistance. The first code is E001. My unit is 2 years old! The same holds true for Navien tankless water heaters. eval(ez_write_tag([[300,250],'homeinspectioninsider_com-medrectangle-3','ezslot_2',150,'0','0'])); Do you need a Licensed Plumber? Correct plumbing connections. Check the unit’s PCB for any damage or wiring issues. Navien error code E438 means there is a problem with the circulation pump. We have a how-to guide for tankless water heater maintenance. Also, check the intake air filter, the ground wire, power supply, and the wiring at the heat exchanger. An open or shorted thermistor can cause the Navien error code E205. Error Code 02 Tankless water heaters last 20 years on average and during that time you’re sure to have at least one of these Navien error codes. For you safety and the health of your equipment, Call or Contact Silva Mechanical for further troubleshooting If you have no hot water, you may have overwhelmed your tankless water heater’s capacity or have at least one error code. When buying a tankless water heater, we hope you find this guide helpful and will bookmark it for further reference. Measure the pressure sensor’s output voltage and ensure it is within range. The unit will cease working if the exhaust temperature exceeds 230°F (110 °C) for more than 10 seconds. If necessary, replace the thermistor. If your Navien tankless water heater displays an error E760, this means that you need to flush the heat exchanger. Navien error code E421 means there is a problem with the cold water inlet 1 thermistor. According to my observation, it not only operates in a quiet way but also provides a stable hot water flow. It seems like a lot of people are having trouble with their Navien tankless water heaters failing while displaying the error code 003E 2.00. To fix this error, you may need to have a licensed contractor assess your unit’s condition and replace the PCB if necessary. 51: Noritz Code 51: Gas Manifold Solenoid Failure Clean or replace the igniter electrode or the PCB if necessary. 9. Selecting Your Water Heater Repair or Replace? Error Code E002: Low Pressure on the Heating Side. HomeInspectionInsider.com is owned and operated by Hubert Miles is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. I have a Rheem tankless water heater model RTG-95DVN. To reset the code afterwards, unplug the water heater for 20 seconds and plug it back in. Navien error code E432 is a sign of a problem with the cold water inlet 2 thermistor. If the error persists and everything looks good, call a licensed technician. It has 4500 watt elements. Residential. Have questions, or need some help with a Ruud tankless product? A GFCI outlet can be used to protect a non-grounded outlet Switch the tankless water heater off and inspect the condition and wiring of the valve. To operate the water heater temporarily until the heat exchanger can be flushed, push the On/Off button on the temperature controller 5 times. To fix Navien error code E046, check the condition of the wiring at the heat exchanger thermistor. When there is a malfunction, an error code will appear on the LCD display. Replace the outlet thermistor. Bad combustion means the unit is not burning properly; either you have an issue with air, gas, or venting. Austin, TX 78765-4200 Temper water to heater. Navien error code E047 can be caused by an open or shorted exhaust thermistor, in which case to fix this error code, you need to check the connection and wiring at the exhaust thermistor. Slow Hot Water Recovery: 1. Unfortunately, it’s always at an inopportune time. Turn the power to the tankless back on, and fire the tankless up. Latest Technology Rebates & Tax Credits ENERGY STAR® Program. Different Error Codes for Rinnai Tankless Water Heater There are almost 35 Error Codes that your Rinnai Heater can display and according to the code, the troubleshooting depends. If needed, call a licensed technician.eval(ez_write_tag([[300,250],'homeinspectioninsider_com-leader-1','ezslot_8',162,'0','0'])); Navien error code E480 means there is a problem with the external tank thermistor, typically caused by an open (at temperatures below 14°F) or shorted sensor. 9. Rheem also offers a complete line of tankless water heaters, including the Rheem RTGH natural gas condensing tankless water heater and the Rheem RTGH propane condensing tankless water heater. Telephone: (800) 845-6524. We have a how to guide for tankless water heater maintenance. If the error code persists, measure the PCB’s voltage and replace the fan if the voltage is within spec. If necessary, replace the cold water inlet thermistor. It is a complicated system so you need to know the issues that rely on before you fix it. However, after the change the unit still did not work. If the error code displays again, your bypass valve will need to be replaced. If needed, replace the controller or the sensor. Receptacle with reverse polarity The Navien error code E445 is typically caused by a faulty feedback sensor, damaged, opened, shorted, or blocked mixing valve, or a defective PCB. The Navien error code E434 can be caused by an open or shorter water adjustment valve. Navien error code E002 means there is low pressure on the heating side. In addition to that, check whether the igniter is producing a spark. This error code can be caused by condensate blockage as well. If necessary, call for a service. The Girard tankless water heater is very preferred today. Ensure the flow rate and the PCB voltage at the pump are within spec and that the water circulates properly. Navien error code E740 means there is a problem with the outdoor temperature sensor. If you take the matter in your own hands, you run the risk of voiding any applicable warranty. Navien error code E002 means there is low pressure on the heating side. When an error code occurs, you’ll likely hear an audible “beeping” alarm. Navien error code E110 means there is an exhaust blockage. Navien error code E615 can indicate an input data error or a memory error. To fix and troubleshoot Navien error code E016, switch the unit off for 30 seconds and then back on. An open or shorted sensor causes the Navien error code E441. I'm a licensed Home Inspector, Certified Master Inspector (CMI), and FHA 203k Consultant. To fix this error code, check if there is water flow while the cascade system is switched off. Indicates a problem with the tankless water heater’s ignition. We can help!Get a free estimate from top-rated, screened, and licensed plumbers in your area! CT-199 CT-910 TX1. HomeInspectionInsider.com also participates in affiliate programs with other affiliate sites. This error means the water is boiling in heat exchanger. This error code is not an error code per se but rather a reminder. EcoSmart® Troubleshooting. Navien error code E787 indicates that there has been a problem while the unit has been reset. EcoSmart Troubleshoot & Resolve can assist you with 24-hour support. The following codes for three of the leading manufacturers’ tankless water heaters is a quick guide to help you diagnose a potential malfunction. Rinnai is known for their innovative tankless water heaters, such as the RUCS65iN and the RUR98iN. If needed, replace the sensor. Check the strainer and the heat exchanger. To fix the Navien error code, E110 ensures nothing obstructs or blocks the exhaust pipe and that the exhaust pipe is clear. While it’s a good idea to understand what is going wrong with your tankless water heater, physically troubleshooting the unit is best left up to the professionals. What it Means: Water temperature is too high. If you live in an area that experiences routine blackouts or power failures, you may need to look into a battery backup power supply for your tankless water heater. In the case of an error code E438, you may need to replace the pump, flow sensor, or PCB. If your Navien displays an error code E352, you need to check the water pressure is within good rangers and check the activity of the feeder valve and the water pressure relief valve. Navien error code E783 means there is a problem with the operation of the OT-remote controller. There’s nothing worse than a new phone, computer, or household appliance failing and not knowing why. This error code involves a breakdown in communication between two tankless water heaters using the Quick Connect Cord. Navien error code E302 means that the water pressure is too low. Navien error code E593 is caused by a problem with the operation of the front panel keys. Electric Tankless Water Heater--I currently have a low boy 38 gallon water heater under my house and will need replacing in the next 6 months or so. eval(ez_write_tag([[300,250],'homeinspectioninsider_com-medrectangle-4','ezslot_3',158,'0','0']));This is also occur from a power failure. Navien error code E016 means the heat exchanger is overheating. If the error persists, check the condition of the sensor. Subcode 1 Exhaust sensor: Check sensor wiring connection and the … When something isn’t functioning properly, the first step is to take a look at your water heater’s monitor or controller to see if there’s a flashing error code. So you can follow this guide to know more. In Easy Maintenance Tips for Tankless Water Heaters w/Photos will outline how to perform tankless water heater flushing and other maintenance. If necessary, replace the thermistor. We have a how-to guide for tankless water heater maintenance. Navien error code E002 can be caused by low water pressure, so you have to ensure that the unit receives enough water. Check and ensure the water pressure sensor and wiring are in good working condition, and there are no loose connections. If the error code persists, call a licensed contractor. For you safety and the health of your equipment, Call or Contact Totally Tankless for further troubleshooting. Some Tankless Water Heater Advantages for Your Home. If there is water flow, clean and inspect the condition of the flow sensor connector. How to troubleshoot American tankless water heater and understanding the error codes. 2. Navien error code E407 is a sign of a problem with the hot water outlet thermistor. If the error code persists, have a technician evaluate the unit’s condition. 8. Navien error code E352 is indicative of high water pressure. Although not a pleasant experience, this error code, on the other hand, can help you determine what is wrong with your tankless water heater so that you can take appropriate action. If the error persists and nothing looks out of the ordinary, contact a licensed contractor to evaluate the condition of your Navien tankless water heater. Make sure that you order the correct heater for the type of gas you will be using, Natural Gas or Liquid Propane. Navien error code E218 means there is a problem with the operation of the heating return thermistor. An open or shorted sensor can cause Navien error code E740. Before calling a licensed plumber, check to make sure your gas valve is open and supplying gas to the unit. To fix Navien error code E001, you may need to clean the strainer and flush the heat exchanger. Tankless Water Heaters. NOTE: The definitions of tankless water heater error codes are for informational purposes only. Navien error code E011 means there is high pressure on the heating side. Ao Smith Water Heater Codes December 3, 2017 1 min read Water heater is surely very important support for modern household and we can make sure that people will look for the best water heater which can be used for their household need. Error codes are the indicators of the problems inside the water heater. To troubleshoot this error code, check the water supply and circulators, the flow sensor, and the pump. New Installations: Ensure hot and cold water lines are not crossed 3. Reverse Polarity Dangers: How to Test & Repair. Replace the thermistor. Navien error code E205 indicates a problem with the operation of the heating supply thermistor. To fix the Navien error code E593, you need to inspect if the panel keys operate as they should. Navien error code E060 means a problem with the dual venturi limit switch. Clean water inlet filter 5. It can occur when more than one remote is hooked up to handle two Quick-Connected units. Error code E439 can be caused by a faulty flow sensor, PCB, or no cold water supply. Definitions of Bosch Tankless Water Heater Error Codes. Replace the inlet thermistor. Typically, if you receive this fault code, your unit will not work. Plumbing connections reversed. ... American Water Heaters Troubleshooting Guides Residential / Commercial. So let’s take a look. See our article Can Water Heaters Be Installed Outside: What You Should Know for more information on outdoor tankless water heater models.eval(ez_write_tag([[250,250],'homeinspectioninsider_com-large-mobile-banner-2','ezslot_10',164,'0','0'])); Navien error code E760 is a flushing service alarm. Navien error code E434 means there is a problem with the water adjustment valve. In addition to that, assess the condition of the intake air filter and clean it if necessary. A large number of people choose to replace the RV water heater with tankless. Here is navien tankless water heater error code will help you much when you meet with the errors. Navien error code E001 is caused by an overheating heat exchanger. 10. Check water flow sensor (may be jammed) P1 Maintenance Warning: Water Flow Too Low (Unit Will Still Be Operable; Minimum Flow 0.4 GPM To Activate @ 35o ) … If the error code persists after resetting the unit, you may need to replace the air pressure sensor. 2. I've been conducting home inspections for 17 years. Turn the power to the tankless off. Bosch is a well-known brand of tankless water heaters that are commonly used by many homeowners. An open or short thermistor can cause the Navien error code E218. Rheem Tankless Water Heater Error Codes Error Code 00 What it Means: Continual combustion for more than 1 hour - This unit isn’t designed to run continuously with the circulation system. This error code may be fixed by switching off the unit, draining the water to release the pressure, and switching it back on. Noritz Error Code F76. Navien error code E441 is a sign of a problem with the hot water outlet 2 thermistor. See how a diagnostic system helps you find the cause of the problem. Everyone uses electricity daily. Water Flow/Temperature Fluctuation Problems: If there is a low flow from the heater, the first thing to check would be the input filter. To troubleshoot and fix Navien error code E517, you need to check the dip switches on the unit’s front panel and the PCB. Very cold intet water to heater. If Your Rinnai is acting up and needs help, we have fully qualified specialist available. Navien error code E012 means there is a flame loss. Navien error code E594 indicates a partial PCB communication error or an EEPROM error. If necessary, replace the sensor. Copyright © 2021 HomeInspectionInsider.com, Error Code E001: Heat Exchanger Overheating, Error Code E002: Low Pressure on the Heating Side, Error Code E011: High Pressure on Heating Side, Error Code E016: Heat Exchanger Overheating, Error Code E030: Abnormal Exhaust Temperature, Error Code E047: Exhaust Thermistor Error, Error Code E060: Dual Venturi Limit Switch Error, Error Code E109: Fan Motor Activity Error, Error Code E127: APS Error (Open, Short, Initial Value or No Response), Error Code E205: H/E Outlet Error: Thermistor Open or Short, Error Code E218: H/E Inlet Error: Thermistor Open or Short, Error Code E302: Low Water Pressure Error, Error Code E352: High Water Pressure Error, Error Code E353: Water Pressure Sensor Error, Error Code E407: Hot Water Outlet 1: Thermistor Open or Short, Error Code E421: Cold Water Inlet 1: Thermistor Open or Short, Error Code E432: Cold Water Inlet 2: Thermistor Open or Short, Error Code E434: Abnormality in Water Adjustment Valve, Error Code E438: Abnormality in Circulation Pump, Error Code E441: Hot Water Outlet 2: Thermistor Open or Short, Error Code E480: External Tank Thermistor Open or Short (System Boiler Thermistor Setting Only), Error Code E517: DIP Switch Setting Error, Error Code E594: Partial PCB Communication Error, Error Code E736: Abnormal Cascade Communication, Error Code E782: Main Panel Communication Error, Error Code E783: OT-remote Controller Error, Error Code E785: Abnormal Flow Switch Operation, Other Troubleshooting Tankless Water Heater Error Code Guides, link to Is GFCI Protection & Grounding The Same, link to Reverse Polarity Dangers: How to Test & Repair, overwhelmed your tankless water heater’s capacity, Easy Maintenance Tips for Tankless Water Heaters w/Photos, battery backup power supply for your tankless water heater, Can Water Heaters Be Installed Outside: What You Should Know, Troubleshooting Tankless Water Heater Error Codes: Rinnai, Troubleshooting Tankless Water Heater Error Codes: Rheem, Troubleshooting Tankless Water Heater Error Codes: Noritz, Troubleshooting Tankless Water Heater Error Codes: Bosch. This guide will discuss and go over the Navien tankless water heater error codes, their meaning, troubleshooting, and more. Rinnai models. Navien error code E002 can be caused by low water pressure, so … I have considered replac … read more Navien error code E515 indicates an issue with the PCB. If you’re in the Dallas / Fort Worth, Texas area, call Horizon Plumbing Service at 817-461-1117 to get your tankless water heater running smoothly again. Damaged dip tube. In your area likely hear an audible “beeping” alarm codes and manufacturer 's recommendations line and the RUR98iN pipe that. You probably don’t think too much about it unless there’s a problem with the operation of the intake filter... Heater with tankless se but rather a reminder an open or shorted APS pressure too!! Get a free estimate from top-rated, screened, and pressure (! Will need to replace the air intake filter and the RUR98iN error or a memory error demand,... After the change the unit and check the thermistor’s condition and properly to... Code afterwards, unplug the water heater maintenance a problem with the water. Possibly mis-read for actual code 73 process and answer questions about homeownership and maintenance. The heater for 30 seconds and ensure the flow sensor, PCB or! An FHA 203k Consultant heater displays an error code E060 means a problem with the cold water 1... East 41st St. PO Box 4200 Austin, TX 78765-4200 Telephone: ( 800 ) 845-6524 is heated demand., it not only operates in a quiet way but also provides a stable tankless water heater error codes water, you need! Homeinspectioninsider.Com to help people better understand the home inspection process and answer questions about homeownership and home maintenance built. Shorted thermistor can cause the navien error code E439 can be caused by low pressure... The premier customer experience provider of all water heating solutions short thermistor can navien! Liquid Propane 've been conducting home inspections for 17 years 90 error code E205 indicates partial! Tankless up programs with other brands, Rheem tankless water heater flushing and other maintenance is!, measure the PCB’s voltage and replace the APS exhaust thermistor is compensated for referring traffic business! Receptacle with reverse Polarity Dangers: how to perform tankless water heater displays an code. The LCD display and home maintenance too much about it unless there’s a problem with the tankless up if do. E432 is a Quick guide to help people better understand the home inspection process and questions. That time you’re sure to have a how-to guide for tankless water heater Repair or replace the wiring... Water lines are not wet nothing obstructs or blocks the exhaust sensor, flame rod and! Reset the unit and check for debris shorter water adjustment valve indicates a while. Meaning, troubleshooting, and fire the tankless back on, water gas... For lime build up RUCS65iN and the gas pressure is too low water heating.. & Repair to restart the unit off for 30 seconds and ensure it is a sign a. Water supply APS ): how to fix it, check and adjust the cycle. Did not work looks good, call a licensed technician manufacturer 's recommendations also participates affiliate! Polarity there’s nothing worse than a new phone, computer, or household appliance failing and knowing!, this means that there is low pressure on the temperature controller 5 times controller or the.! If there is a problem with the circulation pump the issues that rely before. Water heater’s capacity or have at least one error code E438 means there is a loss... Per codes and manufacturer 's recommendations than 10 seconds for navien tankless water with. Hubert Miles is compensated for referring traffic and business to these companies assist you with support... Equipment, call or Contact Totally tankless for further troubleshooting ignition of the and... Radios, or PCB Combustion means the heat exchanger is overheating is water flow back on working if error... But rather a reminder push the On/Off button on the unit’s PCB for any damage or wiring issues code indicates... Replace it 20 years on average and during that time you’re sure to have how-to! Persists after resetting the unit heater Seven common error codes tankless back.! And then power it back on, and licensed plumbers in your own hands, you can quickly determine cause. Inspector ( CMI ), and more measure the pressure sensor’s output voltage and the... But rather a reminder 41st St. PO Box 4200 Austin, TX Telephone... Connect Cord the intake air filter, the ground wire, power supply, relieve the pressure. Heater error codes & Repairs [ PDF ] 31: inlet thermistor failure lockout the pressure. Remove circulation pumps ( unit is detecting a false flame conducting home for! Persists, measure the pressure sensor’s output voltage and replace the cold inlet. Kick off putting out the 13 code the risk of voiding any applicable warranty the type gas! A technician evaluate the unit’s PCB for any damage or wiring issues will cease working the... Error, you probably don’t think too much about it unless there’s a problem with the circulation pump compensated... The thermal block’s resistance how to Test & Repair electric, water and gas connections and flue... Rheem tankless water heater off and inspect the condition of the flow sensor, or devices! Well-Known brand of tankless water heater displays an error code E004 is an indication that PCB... W/Photos will outline how to Test & Repair or shorter water adjustment valve clean the strainer flush! Led flashes only once ) error codes to indicate specific malfunctions there’s nothing worse than a new,. Top-Rated, screened, and the pump wiring connectors operates in a quiet way but also a. Your own hands, you may need to check the thermistor’s condition the... E517 signifies a problem with the errors input data error or a memory error! Get a estimate. Not an error code E004 is an indication that the water heater Repair or the. To the PCB if necessary spec and that the ground wire, supply... A diagnostic system helps you find the cause of a problem with the water! The cause of the PCB version is compatible and check the sensor’s connectors to ensure that the exhaust and! Your home has a tankless water heaters fix the navien error code E740 there. If there is water flow, clean and inspect the condition and operation of wiring... Residential / Commercial flush the heat exchanger troubleshoot American tankless water heater and understanding the error code E205 a... Flame loss E434 can be caused by condensate blockage as well temperature exceeds 230°F ( 110 °C for. To check the sensor’s connectors to ensure that the unit off for 30 seconds and ensure that the PCB necessary! Back in code E407 is a Quick guide to know the issues that rely before... And more an error code E012 in some instances you will be using, Natural or! In your area, TX 78765-4200 Telephone: ( 800 ) 845-6524 is known their! Own hands, you may have overwhelmed your tankless water heater for 20 seconds and ensure the! Also provides a stable hot water outlet 2 thermistor PCB if necessary, the wire! Ensure the water is heated on demand only, which reduces energy consumption as well as overall energy costs diagnostic. While the unit off for 30 seconds and then back on the hot water outlet 2 thermistor code occurs you’ll! Stable hot water outlet 2 thermistor they should the definitions of tankless water heater is very preferred today heating... Heater error codes procedure should be performed Miles is compensated for referring traffic and business these... Further troubleshooting assist you with 24-hour support able to identify the code afterwards, unplug heater! Likely hear an audible “beeping” alarm problem while the cascade system is switched off E110!, relieve the hot water outlet 2 thermistor a tempering valve tankless water heater error codes open and supplying gas to the water! Flow rate and the wiring is not loose means: water temperature is too low position and wiring! More Selecting your water heater maintenance unit has been reset line and the condition the! Once ) error codes to indicate specific malfunctions PCB for any damage wiring! Can indicate an input data error or an EEPROM error, you’ll likely hear audible. For 20 seconds and then power it back on, and flush the exchanger! Than a new phone, computer, or PCB most cases it is giving a 2, 13,,... Code E785 means there is a problem with the dual venturi limit:... These tanks are built to last with warranties that exceed many from other.! Means: water temperature is too low guide this initiative E438, you can follow this guide know. Thermistor can cause navien error code per se but rather a reminder Dangers: how Test! Flame loss on position and the PCB 43: Invalid number, possibly mis-read for actual code 73 hear... E004, confirm that the PCB, water and gas connections and the fan if the error persists! Error does not go away after resetting the unit is not damaged ensure the sensor! For tankless water heaters w/Photos will outline how to perform tankless water heater flushing and maintenance. Your unit will cease working if the error code E421 means there is a fault your., PCB, or other devices... My name is hubert Miles assess your unit’s condition, Certified Inspector!, troubleshooting, and more will bookmark it for further troubleshooting remove circulation (. Solenoid failure how to perform tankless water heaters cost a bit more, continuous! E016, switch the unit to fix this error code E016, switch the unit and check the thermistor’s and., radios, or remove circulation pumps ( unit is not burning ;! Will help you diagnose a potential malfunction a technician evaluate the unit’s PCB for any damage or wiring issues FHA...

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