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We've got you covered with our top techniques for fixing tankless water heaters.

In this article, we'll walk you through common error codes and troubleshooting steps, as well as how to flush the system for improved performance.

We'll also cover cleaning and descaling the heat exchanger, inspecting and replacing faulty sensors, and adjusting gas and water pressure.

Get ready to tackle any issues with your tankless water heater like a pro!

Common Error Codes and Troubleshooting

In our experience, we've found that troubleshooting tankless water heaters becomes easier when we familiarize ourselves with common error codes. These codes serve as valuable diagnostic tools, providing insights into the underlying issues that may be causing the heater to malfunction.

By understanding these error codes, we can quickly identify the problem and take the necessary steps to fix it. For example, if we encounter an error code indicating a problem with the ignition, we know that there may be an issue with the gas supply or the igniter itself. Armed with this knowledge, we can confidently address the problem and restore the heater's functionality.

Therefore, it's essential to educate ourselves about the common error codes associated with tankless water heaters to streamline the troubleshooting process.

Flushing the System for Improved Performance

To improve performance, we recommend flushing the tankless water heater system regularly. Flushing the system helps remove mineral deposits and sediment that can accumulate over time and hinder the heater's efficiency. These deposits can cause reduced water flow, inconsistent water temperatures, and even complete system failure if left untreated.

Flushing the system involves connecting a hose to the heater's inlet and outlet valves and running vinegar or a descaling solution through the system. This helps dissolve and remove the buildup, restoring the heater's optimal functionality. It's important to follow the manufacturer's instructions and guidelines when flushing the system to ensure safe and effective cleaning.

Cleaning and Descaling the Heat Exchanger

Regular cleaning and descaling of the heat exchanger is essential for maintaining the efficiency and longevity of a tankless water heater. Over time, mineral deposits can accumulate on the heat exchanger, hindering its ability to transfer heat effectively and causing the heater to work harder than necessary. This can lead to decreased performance and higher energy consumption.

To clean and descale the heat exchanger, start by turning off the power and gas supply to the water heater. Then, remove the cover and locate the heat exchanger. Using a descaling solution, carefully clean the heat exchanger, ensuring that all mineral deposits are removed. Rinse thoroughly and reassemble the water heater.

Regular cleaning and descaling of the heat exchanger will help maintain optimal performance and extend the lifespan of your tankless water heater.

Inspecting and Replacing Faulty Sensors

Our first step in inspecting and replacing faulty sensors is to check the connections and functionality of the sensors.

We begin by carefully examining the wiring connections to ensure they're secure and properly attached. Loose or damaged connections can lead to sensor malfunctions or false readings.

Next, we test the sensors to verify their functionality. This involves using a multimeter to measure the resistance of each sensor. If the readings are outside the acceptable range, it indicates a faulty sensor that needs to be replaced.

When replacing a sensor, we make sure to use the correct replacement part specified by the manufacturer. Additionally, we carefully follow the installation instructions to ensure proper positioning and connection of the new sensor.

Adjusting Gas and Water Pressure

One important step is to adjust the gas and water pressure to ensure optimal performance. When it comes to tankless water heaters, getting the right balance of gas and water pressure is crucial. Too much or too little pressure can lead to problems such as fluctuating temperatures or even complete failure of the unit.

To adjust the gas pressure, locate the gas control valve and use a wrench to turn it clockwise to increase pressure or counterclockwise to decrease pressure.

To adjust the water pressure, locate the water control valve and turn it clockwise to increase pressure or counterclockwise to decrease pressure.

It's important to make small adjustments and test the water heater after each adjustment to ensure the desired pressure is achieved.

Frequently Asked Questions

How Often Should a Tankless Water Heater Be Serviced?

When it comes to servicing tankless water heaters, we recommend getting them serviced annually. Regular maintenance helps ensure that your tankless water heater is operating efficiently and effectively.

It allows for early detection of any potential issues and helps prolong the lifespan of the unit. During the service, a professional will clean and inspect the unit, flush out any sediment buildup, and check for any leaks or malfunctioning parts.

This preventative maintenance is crucial in keeping your tankless water heater in good working condition.

Can a Tankless Water Heater Be Installed Outside?

Yes, a tankless water heater can be installed outside.

It's important to note that proper installation is crucial to ensure the unit's optimal performance and longevity.

When installing a tankless water heater outside, it's essential to protect it from the elements and provide adequate ventilation.

Additionally, it's recommended to consult a professional plumber or technician who specializes in tankless water heaters to ensure a safe and efficient installation.

What Is the Average Lifespan of a Tankless Water Heater?

The average lifespan of a tankless water heater can vary depending on several factors. These factors include the quality of the unit, the amount of usage, and how well it's maintained. On average, a tankless water heater can last between 15 to 20 years.

However, it's important to note that regular maintenance and proper usage can extend its lifespan. It's always a good idea to consult with a professional to ensure your tankless water heater is operating efficiently and to address any issues that may arise.

Are Tankless Water Heaters Energy Efficient?

Yes, tankless water heaters are energy efficient. They only heat water when it's needed, unlike traditional water heaters that constantly keep a large tank of water hot.

This means that tankless water heaters can save energy and reduce utility bills. Additionally, they've a longer lifespan compared to traditional water heaters, further contributing to their energy efficiency.

Can a Tankless Water Heater Be Installed in a Small Space?

Yes, a tankless water heater can be installed in a small space. It's a compact and space-saving option compared to traditional water heaters.

With their wall-mounted design, tankless water heaters take up less room and can be installed in tight spaces like closets or utility rooms. This makes them ideal for homes or apartments with limited space.

Additionally, their smaller size allows for more flexibility in installation, giving homeowners more options when it comes to finding the perfect spot for their tankless water heater.


In conclusion, by following the top techniques for fixing tankless water heaters, homeowners can address common error codes. This includes improving performance through system flushing, cleaning and descaling the heat exchanger, inspecting and replacing faulty sensors, and adjusting gas and water pressure.

These steps will help ensure the efficient and reliable operation of tankless water heaters. Additionally, they will provide a continuous hot water supply and avoid potential issues.