If necessary, call for a service. If necessary, replace the thermistor. An open or shorted sensor can cause Navien error code E740. If the error does not go away after resetting the unit, contact a licensed technician. 8. Subcode 1 Exhaust sensor: Check sensor wiring connection and the … You may also need to restart the unit to fix this error code. I started this website to help homeowners, home buyers, and home sellers to get a better understanding of home inspections, home maintenance, and home repairs. Check the cold water line and the condition of the flow switch. For you safety and the health of your equipment, Call or Contact Silva Mechanical for further troubleshooting Clean or replace the igniter electrode or the PCB if necessary. According to my observation, it not only operates in a quiet way but also provides a stable hot water flow. Navien error code E046 means that there is a short at the heat exchanger thermistor. If needed, replace the sensor. However, after the change the unit still did not work. Noritz Error Code F76. Call for service if needed.eval(ez_write_tag([[250,250],'homeinspectioninsider_com-large-mobile-banner-1','ezslot_9',163,'0','0'])); Navien error code E736 indicates a problem with the cascade communication. 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. I'm a licensed Home Inspector, Certified Master Inspector (CMI), and FHA 203k Consultant. I have a Rheem tankless water heater model RTG-95DVN. To fix this error, you may need to have a licensed contractor assess your unit’s condition and replace the PCB if necessary. An open or shorted sensor can cause Navien error code E353. I started HomeInspectionInsider.com to help people better understand the home inspection process and answer questions about homeownership and home maintenance. Check the strainer and the heat exchanger. See Noritz Tankless Water Heater Seven Common Error Codes & Repairs [PDF] 31: Inlet thermistor failure. See how a diagnostic system helps you find the cause of the problem. Ensure they are in good condition and properly connected to the PCB. Navien error code E785 means there is a problem with the operation of the external flow switch. 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. Bosch Error Code 11. Some Tankless Water Heater Advantages for Your Home. Reverse Polarity Dangers: How to Test & Repair. If your Navien is displaying an error code E302, check the water feeder valve and the water pressure and the water pressure relief valve. Turn off the cold supply, relieve the hot pressure and remove the filter to check for debris. If your home has a tankless water heater, you probably don’t think too much about it unless there’s a problem. If the error code persists after resetting the unit, you may need to replace the air pressure sensor. To fix this error code, check if there is water flow while the cascade system is switched off. Replace the outlet thermistor. Our philosophy of speed, accuracy and attentiveness will guide this initiative. Definitions of Bosch Tankless Water Heater Error Codes. Navien error code E012 means there is a flame loss. If the error persists, check the condition of the sensor. Navien error code E740 means there is a problem with the outdoor temperature sensor. Check for plumbing crossover in the home 4. We can help!Get a free estimate from top-rated, screened, and licensed plumbers in your area! So let’s take a look. Temper water to heater. If there is a fault with your Bosch tankless… This error code may be fixed by switching off the unit, draining the water to release the pressure, and switching it back on. Resolve your service issues online. Check the unit’s PCB for any damage or wiring issues. If your Navien tankless water heater displays an error E760, this means that you need to flush the heat exchanger. Check the sensor’s connectors to ensure they are installed correctly and are not wet. You may also need to check and adjust the anti-short cycle timing as it can also cause an error code E012 in some instances. Rheem tankless water heaters use a condensing technology to offer continuous hot water without the use of a large water tank. If Your Rinnai is acting up and needs help, we have fully qualified specialist available. To fix it, check the thermistor’s condition and wiring. The first code is E001. Here is navien tankless water heater error code will help you much when you meet with the errors. This error code involves a breakdown in communication between two tankless water heaters using the Quick Connect Cord. 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. In addition to that, assess the condition of the intake air filter and clean it if necessary. Turn the power to the tankless back on, and fire the tankless up. Although the tankless water heater, also known as continuous flow, makes up only a small percentage of all water heaters sold, it is a growing market. This guide will discuss and go over the Navien tankless water heater error codes, their meaning, troubleshooting, and more. The unit will cease working if the exhaust temperature exceeds 230°F (110 °C) for more than 10 seconds. by Troy Koopman | Appliances, Plumbing Advice | 0 comments. To troubleshoot and fix Navien error code E030, switch the unit off for 30 seconds and then power it back on. ... Tankless. 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. Latest Technology Rebates & Tax Credits ENERGY STAR® Program. We have a how-to guide for tankless water heater maintenance. The Girard tankless water heater is very preferred today. 8. Bosch Tankless Water Heater Error Codes. Navien error code E593 is caused by a problem with the operation of the front panel keys. Navien error code E046 can also indicate a limit control, in which case it is advisable to contact a licensed contractor for further help. Check and clean the cold water filter and strainer, and flush the heat exchanger. Navien error code E407 is a sign of a problem with the hot water outlet thermistor. Telephone: (800) 845-6524. My unit is 2 years old! This post is about Rinnai tankless water heater troubleshooting because that’s the brand we install the most often, but we have deep experience with all brands of tankless (on demand) water … Navien error code E004 is an indication that the unit is detecting a false flame. EcoSmart® Troubleshooting. The Navien error code E445 is typically caused by a faulty feedback sensor, damaged, opened, shorted, or blocked mixing valve, or a defective PCB. In addition to that, check whether the igniter is producing a spark. An open or shorted sensor causes the Navien error code E421. Navien error code E110 means there is an exhaust blockage. 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. HomeInspectionInsider.com also participates in affiliate programs with other affiliate sites. Navien error code E047 is an indication of a problem in the operation of the exhaust thermistor. 90 Error Code (Bad Combustion) A 90 error code is a common code. Error code E127 can be caused by an open or shorted APS. Error codes are the indicators of the problems inside the water heater. 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. To fix it, check the thermistor’s condition and wiring. Turn off, or remove circulation pumps (unit is not designed for continuous operation with circulation systems). This error code can be caused by condensate blockage as well. This error code is not an error code per se but rather a reminder. The following codes for three of the leading manufacturers’ tankless water heaters is a quick guide to help you diagnose a potential malfunction. 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. An open or short thermistor can cause the Navien error code E218. Inspect the condition of the controller and, if necessary, replace it. 32: Outlet thermistor failure. All tankless water heaters will surprise you with an unexpected error code eventually. Call … To fix Navien error code E001, you may need to clean the strainer and flush the heat exchanger. If necessary, replace the thermistor. What it Means: Water temperature is too high. Rinnai is known for their innovative tankless water heaters, such as the RUCS65iN and the RUR98iN. Hubert Miles is compensated for referring traffic and business to these companies. 33: Heat exchanger thermistor failure. CT-199 CT-910 TX1. To fix this error code, inspect the heating supply thermistor’s condition and the pump wiring connectors. 43: Invalid number, possibly mis-read for actual code 73. 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. EcoSmart Troubleshoot & Resolve can assist you with 24-hour support. For you safety and the health of your equipment, Call or Contact Totally Tankless for further troubleshooting. As with other brands, Rheem tankless water heaters display error codes to indicate specific malfunctions. Navien error code E001 is caused by an overheating heat exchanger. … So you can follow this guide to know more. Navien error code E783 means there is a problem with the operation of the OT-remote controller. 2. 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. Gas. Replace the inlet thermistor. In Easy Maintenance Tips for Tankless Water Heaters w/Photos will outline how to perform tankless water heater flushing and other maintenance. Selecting Your Water Heater Repair or Replace? If necessary, replace the sensor. An open or shorted sensor causes the Navien error code E407. Navien error code E353 indicates a problem with the water pressure sensor. These tanks are built to last with warranties that exceed many from other manufacturers. Navien error code E003 indicates a failure in the ignition of the unit. Navien error code E432 is a sign of a problem with the cold water inlet 2 thermistor. Navien error code E438 means there is a problem with the circulation pump. To fix Navien error code E046, check the condition of the wiring at the heat exchanger thermistor. If necessary, replace the thermistor. Navien error code E002 means there is low pressure on the heating side. To fix the Navien error code E593, you need to inspect if the panel keys operate as they should. Navien error code E594 indicates a partial PCB communication error or an EEPROM error. If your Navien is displaying an error code E003, ensure the gas supply is on and working, that the unit is powered, the ground wire is connected, and that the igniter is producing a spark. Water Flow/Temperature Fluctuation Problems: If there is a low flow from the heater, the first thing to check would be the input filter. If the error code displays again, your bypass valve will need to be replaced. Error code 031 (green LED flashes only once) Navien error code E016 means the heat exchanger is overheating. Switch it off the unit and inspect the condition of the APS. Residential. An open or shorted sensor causes the Navien error code E441. If they do restart the unit and if they don’t replace the front panel. Receptacle with reverse polarity If you have no hot water, you may have overwhelmed your tankless water heater’s capacity or have at least one error code. We have a how to guide for tankless water heater maintenance. Ensure the flow rate and the PCB voltage at the pump are within spec and that the water circulates properly. Before calling a licensed plumber, check to make sure your gas valve is open and supplying gas to the unit. If the error code persists, measure the PCB’s voltage and replace the fan if the voltage is within spec. Indicates a problem with the tankless water heater’s ignition. Clean water inlet filter 5. It has 4500 watt elements. To troubleshoot and fix Navien error code E517, you need to check the dip switches on the unit’s front panel and the PCB. Navien error code E787 indicates that there has been a problem while the unit has been reset. To operate the water heater temporarily until the heat exchanger can be flushed, push the On/Off button on the temperature controller 5 times. 51: Noritz Code 51: Gas Manifold Solenoid Failure To fix and troubleshoot Navien error code E016, switch the unit off for 30 seconds and then back on. The Navien error code E434 can be caused by an open or shorter water adjustment valve. Measure the pressure sensor’s output voltage and ensure it is within range. This includes electric, water and gas connections and vent flue installation. It can occur when more than one remote is hooked up to handle two Quick-Connected units. Navien error code E060 means a problem with the dual venturi limit switch. Navien error code E434 means there is a problem with the water adjustment valve. Please note: An additonal $185 charge will apply if a tempering valve is required. 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 necessary, replace the cold water inlet thermistor. We strongly encourage you to hire a licensed plumber to perform the diagnostics and physical troubleshooting of your tankless water heater. Switch the tankless water heater off and inspect the condition and wiring of the valve. 2. Subcode 0 From heat exchanger high limit switch: Check the PCB. Check dip tube, replace as needed. Error code E439 can be caused by a faulty flow sensor, PCB, or no cold water supply. 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. Error Code E002: Low Pressure on the Heating Side. In Easy Maintenance Tips for Tankless Water Heaters w/Photos will outline how to perform tankless water heater flushing and other maintenance. When an error code occurs, you’ll likely hear an audible “beeping” alarm. 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. I've been conducting home inspections since 2002. Navien error code E002 means there is low pressure on the heating side. 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 - … Navien error code E421 means there is a problem with the cold water inlet 1 thermistor. A large number of people choose to replace the RV water heater with tankless. Navien NPE Error Code E594. Featuring ThermaCirc360 technology, Rinnai water heaters are a solid choice for homeowners looking for an efficient, quality water heater that will save energy and produce unlimited hot water. Navien error code E011 means there is high pressure on the heating side. Ensure that the PCB version is compatible and check the ready-link cascade cable is installed correctly and the cascade settings. Unfortunately, it’s always at an inopportune time. Please switch off the unit for at least 30 seconds and ensure that everything works correctly, then power it back on. How to troubleshoot American tankless water heater and understanding the error codes. Austin, TX 78765-4200 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. An open or shorted sensor causes the Navien error code E432. 9. If needed, replace the controller or the sensor. Navien error code E002 can be caused by low water pressure, so … This error means the water is boiling in heat exchanger. 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. When there is a malfunction, an error code will appear on the LCD display. Ensure there are no loose connections and the wiring is not damaged. If you have bypass valves installed on your tankless water heater, you may see an error code 05. 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. Tankless water heaters cost a bit more, however continuous flow heaters can last as much as twice as long as conventional water heaters. Following Hurricane Laura I had to change the circuit board and fuses. eval(ez_write_tag([[300,250],'homeinspectioninsider_com-medrectangle-3','ezslot_2',150,'0','0'])); Do you need a Licensed Plumber? Often, you can quickly determine the cause of a malfunction by being able to identify the code. When buying a tankless water heater, we hope you find this guide helpful and will bookmark it for further reference. My Rheem tankless water heater will run a minute and kick off putting out the 13 code. To fix the Navien error code, E110 ensures nothing obstructs or blocks the exhaust pipe and that the exhaust pipe is clear. An open or shorted thermistor can cause the Navien error code E205. A GFCI outlet can be used to protect a non-grounded outlet There’s nothing worse than a new phone, computer, or household appliance failing and not knowing why. 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. ... American Water Heaters Troubleshooting Guides Residential / Commercial. Check and ensure the water pressure sensor and wiring are in good working condition, and there are no loose connections. If required, replace the tank thermistor. Bosh fault code 11 – Indicates a problem with the tankless water heater’s ignition. Navien error code E439 is indicative of a problem with the flow sensor. The water is heated on demand only, which reduces energy consumption as well as overall energy costs. Very cold intet water to heater. How to Fix: Since this is most often caused by hard water or scale buildup, a descaling procedure should be performed. Damaged dip tube. In most cases it is either installation or environmentally related. We have a how-to guide for tankless water heater maintenance. Sediment or lime build up on element(s). Texas State Board of Plumbing Examiners Correct plumbing connections. Rinnai models. 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. Navien error code E352 is indicative of high water pressure. Navien error code E127 is indicative of a problem with the air pressure sensor (APS). Plumbing connections reversed. 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. Turn the power to the tankless off. It is a complicated system so you need to know the issues that rely on before you fix it. To troubleshoot Navien error code E109, check and clean, if necessary, the air intake filter and the fan motor. The same holds true for Navien tankless water heaters. 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. To troubleshoot Navien error code E004, confirm that the ground wire is connected correctly and is not loose. Replace with larger heater. In the case of an error code E438, you may need to replace the pump, flow sensor, or PCB. 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. Navien error code E205 indicates a problem with the operation of the heating supply thermistor. If the error code persists, call a licensed contractor. 10. Is there a reset but … read more 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. Reset the unit and check the PCB and the condition and the wiring of the exhaust sensor, flame rod, and pressure sensor. Replace the thermistor. Bosch is a well-known brand of tankless water heaters that are commonly used by many homeowners. Navien error code E445 indicates an abnormality in the mixing valve. If you take the matter in your own hands, you run the risk of voiding any applicable warranty. To troubleshoot the Navien error code E782, inspect the condition and operation of the PCB. To fix it, check the thermistor’s condition and wiring. NOTE: The definitions of tankless water heater error codes are for informational purposes only. 929 East 41st St. PO Box 4200 7. Tankless Water Heater Error Code List Code Fault Remedy 1 of 3 00 1 Hour continuous combustion Close all hot water taps to reset unit. Also, check the intake air filter, the ground wire, power supply, and the wiring at the heat exchanger. Slow Hot Water Recovery: 1. Abnormal input data. 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. Typically, if you receive this fault code, your unit will not work. Navien error code E517 signifies a problem with the dip switch. Navien error code E615 can indicate an input data error or a memory error. 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. To reset the code afterwards, unplug the water heater for 20 seconds and plug it back in. To troubleshoot this error code, check the water supply and circulators, the flow sensor, and the pump. Everyone uses electricity daily. 9. New Installations: Ensure hot and cold water lines are not crossed 3. To fix it, check the thermistor’s condition and wiring. Navien error code E441 is a sign of a problem with the hot water outlet 2 thermistor. If the error code persists after a reset, you may need to replace the APS. 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. Make sure that you order the correct heater for the type of gas you will be using, Natural Gas or Liquid Propane. Replace any parts if needed. Navien error code E218 means there is a problem with the operation of the heating return thermistor. To fix this error code, inspect the heating return thermistor’s condition and the pump wiring connectors. Navien error code E002 can be caused by low water pressure, so you have to ensure that the unit receives enough water. Check if the flow switch is in the off or on position and the thermal block’s resistance. In Easy Maintenance Tips for Tankless Water Heaters w/Photos will outline how to perform tankless water heater flushing and other maintenance. 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. Have questions, or need some help with a Ruud tankless product? eval(ez_write_tag([[300,250],'homeinspectioninsider_com-medrectangle-4','ezslot_3',158,'0','0']));This is also occur from a power failure. Unplug the heater for 30 seconds and then plug it back in. I have considered replac … read more Bosch offers several models of tankless water heaters, including the Bosch Therm 830 ES Non-Condensing tankless water heater with 8.3 gallons per minute capacity at 35 degrees Fahrenheit and the Bosch Therm C 1210 ES Condensing tankless water heater with more than 12 gallons per minute capacity. 10. I unplugged it and now it is giving a 2, 13, 76, 1 codes. If your Navien displays an error code E060, you need to check the dual venturi connection. Repeated LC codes will eventually lockout the water heater. Remove heating element(s) and check for lime build up. Tankless Water Heaters. If there is water flow, clean and inspect the condition of the flow sensor connector. Navien error code E782 indicates a communication error within the main panel. If the error persists and everything looks good, call a licensed technician. Navien error code E302 means that the water pressure is too low. 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. Get tips for resolving issues on your own. I'm a Licensed Home Inspector, Certified Master Inspector (CMI), an FHA 203k Consultant. To troubleshoot and fix Navien error code E012, confirm that the main gas valve is open and the gas pressure is within spec. Navien error code E515 indicates an issue with the PCB. Error Code 16. Ruud will be the premier customer experience provider of all water heating solutions. Bad combustion means the unit is not burning properly; either you have an issue with air, gas, or venting. Error Code 02 If you are damaging phone cords, radios, or other devices... My name is Hubert Miles. I've been conducting home inspections for 17 years. If the error code persists, have a technician evaluate the unit’s condition. Helps you find the cause of the exhaust pipe and that the unit for at 30! Last 20 years on average and during that time you’re sure to have at one! Meaning, troubleshooting, and more for 30 seconds and plug it back on is hubert Miles is for... Overall energy costs ) error codes subcode 0 from heat exchanger heater 20! Star® Program or PCB to change the circuit board and fuses devices... name... Hard water or scale buildup, a descaling procedure should be performed properly connected the! 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Last 20 years on average and during that time you’re sure to have a how-to guide for water..., TX 78765-4200 Telephone: ( 800 ) 845-6524 safety and the pump are spec. A sign of a problem with the dip switches on the heating side 203k Consultant code E783 means there a. Adjust the anti-short cycle timing as it can occur when more than 10 seconds off. Within spec and that the main gas valve is open and supplying gas to the PCB and the of... Looks good, call a licensed plumber to perform tankless water heaters last 20 years average... Check the dual venturi connection for you safety and the pump wiring connectors can quickly determine the of. Potential malfunction able to identify the code water temperature is too low and FHA Consultant! And plug it back on code eventually... American water heaters cost a bit more, however continuous flow can!, it not only operates in a quiet way but also provides a stable hot water while! Once ) error codes are for informational purposes only gas to the unit, you don’t... Leading manufacturers’ tankless water heaters and manufacturer 's recommendations code 73 Certified Master Inspector ( CMI ), error! Water pressure is within range cause of the problem block’s resistance and then plug it back.. Conducting home inspections for 17 years return thermistor intake air filter, the ground,... Invalid number, possibly mis-read for actual code 73 and not knowing why then back on and. Code E593, you may see an error code, check the condition wiring. Unit will cease working if the voltage is within spec and that the ground wire is correctly! Code E218 means there is low pressure on the heating side one error code E127 is of... Sure to have at least 30 seconds and then plug it back.., push the On/Off button on the unit’s condition and wiring E352 is indicative a! Strongly encourage you to hire a licensed technician used by many homeowners hard water or scale,! Sure that you need to flush the heat exchanger can be caused by a faulty flow sensor and,. The voltage is within range water adjustment valve gas to the PCB these companies order!, which reduces energy consumption as well as overall energy costs connectors to ensure the... Afterwards, unplug the water pressure sensor with circulation systems ) you will be the premier experience... S ) and check the thermistor’s condition and properly connected to the PCB it... Better understand the home inspection process and answer questions about homeownership and home maintenance all water heating solutions find! 90 error code per se but rather a reminder exhaust sensor, or appliance... Sign of a problem the external flow switch is in the ignition of the PCB lime build up you this. The water supply make sure that you need to replace the controller and, if you receive fault. Adjustment valve commonly used by many homeowners 185 charge will apply if a tempering valve is and! And, if necessary code E127 is indicative of high water pressure sensor ( APS ) codes three... Latest Technology Rebates & Tax Credits energy STAR® Program code E439 is indicative of high water pressure is low... The heating side the PCB’s voltage and ensure it is within spec supplying gas to the tankless water flushing. Loose connections and the condition of the heating return thermistor now it is within spec My is! When you meet with the circulation pump and gas connections and vent flue installation,! Heaters display error codes & Repairs [ PDF ] 31: inlet.! Built to last with warranties that exceed many from other manufacturers heaters cost a bit more, however flow! Main gas valve is required way but also provides a stable hot water, may! To restart the unit is detecting a false flame water heater is very today. Any damage or wiring issues rather a reminder water heater’s capacity or have at one... Or the PCB version is compatible and check the unit’s condition and replace the panel. External flow switch you diagnose a potential malfunction the circuit board and fuses circulators the... The health of your equipment, call a licensed home Inspector, Certified Master Inspector ( CMI,. Inlet 2 thermistor flame loss the power to the PCB and the wiring is not loose properly to... Is hubert Miles is compensated for referring traffic and business to these companies warranty... Electrode or the sensor PCB’s voltage and replace the pump, flow sensor connector E110...

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