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Tankless Water Heater

The Ultimate Guide to Tankless Water Heater Repair: Common Issues and Solutions


When it comes to hot water in your home, tankless water heaters are a popular choice for their energy efficiency and endless supply of hot water. However, like any appliance, tankless water heaters can encounter issues that require repair. In this ultimate guide, we will discuss common problems that may arise with tankless water heaters and provide solutions to help you troubleshoot and fix them. 

1. No Hot Water 

One of the most common issues with tankless water heaters is a lack of hot water. If you are experiencing this problem, there are a few potential causes to consider. Firstly, check the power source to ensure the unit is receiving electricity or gas. If the unit is powered on but still not producing hot water, there may be a problem with the heating elements or a blockage in the water line. In this case, it is best to contact a professional plumber for further inspection and repair. 

2. Fluctuating Water Temperature 

Another common issue with tankless water heaters is fluctuating water temperature. If you notice that the water temperature is inconsistent or constantly changing, it may be due to a dirty or clogged filter, a malfunctioning thermostat, or a problem with the flow rate. To resolve this issue, try cleaning the filter or adjusting the flow rate. If the problem persists, it is recommended to schedule a maintenance check with a qualified technician. 

3. Ignition Failure 

If your tankless water heater is not igniting or producing a flame, it may be due to a faulty igniter, a gas supply issue, or a problem with the venting system. Check the gas supply to ensure it is connected and functioning properly. If the gas supply is not the issue, the igniter or venting system may need to be inspected and repaired by a professional. 

4. Error Codes 

Many tankless water heaters are equipped with digital displays that show error codes to indicate specific issues with the unit. If you see an error code displayed on your tankless water heater, refer to the user manual for troubleshooting steps. Common error codes may indicate issues with the venting system, water flow, or pressure sensors. By understanding the error codes and following the recommended steps, you can often resolve the issue without the need for professional repair. 

5. Leaks 

Leaks are another common problem that can occur with tankless water heaters. If you notice water pooling around the unit or dripping from the connections, it is important to address the issue promptly to prevent water damage and mold growth. Leaks may be caused by loose fittings, damaged seals, or corroded pipes. Inspect the connections and components of the unit to identify the source of the leak and tighten or replace any damaged parts as needed. 

6. Lime Scale Buildup 

Over time, mineral deposits and lime scale can accumulate in the heat exchanger of a tankless water heater, reducing its efficiency and causing issues with heating. To prevent lime scale buildup, it is recommended to flush the unit regularly and descale the heat exchanger as needed. If you notice a decrease in hot water production or efficiency, it may be time to perform a descaling procedure or seek professional maintenance. 

7. Regular Maintenance 

To prevent common issues with tankless water heaters and ensure optimal performance, regular maintenance is essential. Schedule annual maintenance checks with a qualified technician to inspect the unit, clean components, and identify any potential problems before they escalate. By maintaining your tankless water heater properly, you can extend its lifespan and avoid costly repairs in the future. 


Tankless water heaters offer many benefits for homeowners, but like any appliance, they may encounter issues that require repair. By understanding common problems and solutions for tankless water heater repair, you can troubleshoot issues effectively and prevent costly repairs. Remember to perform regular maintenance, follow manufacturer guidelines, and consult a professional plumber when needed for complex repairs. With proper care and attention, your tankless water heater can continue to provide reliable hot water for years to come. 

Need a Plumber in Boise, ID?

Welcome to Gary The Plumber LLC., where excellence in plumbing meets a commitment to customer satisfaction. With a legacy of reliable service, we take pride in being a trusted name for both residential and commercial plumbing needs. At the heart of our mission is a dedication to providing comprehensive plumbing solutions with a focus on quality, integrity, and professionalism. Call us today!



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