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Tankless Water Heater Repair

Ignition failure on gas tankless water heaters can occur due to several issues. Check that the gas valve is open, there are no leaks, and you have paid your gas bill. Also, check the igniter and flame sensor to ensure they are not clogged with dirt, debris, or corrosion. For professional help, contact Tankless Water Heater Repair Denver.

Tankless Water Heater Repair

The water temperature of your tankless water heater should be consistent and within a safe range to prevent scalding. However, if you experience excessively hot or cold water, this is a sign that the unit has a malfunctioning thermostat or temperature sensor. To resolve this issue, consult the manufacturer’s manual for troubleshooting steps for your model. If the problem persists, consult a professional to inspect and repair the unit.

Another common issue is a leaking tankless water heater. This can occur due to loose connections or attachments, corrosion, or damage to the unit’s pressure relief valve or heat exchanger. If you suspect a leak, shut off power to the unit by switching off the circuit breaker. Then, thoroughly inspect the unit for visible signs of a leak and tighten any loose connections or attachments.

If you notice an odor or sediment in your tankless water, it’s likely due to mineral buildup in the unit. This can be prevented by performing regular maintenance, including flushing the unit and removing accumulated minerals. It’s also recommended to use a water filter or softener to reduce the amount of sediment in your home’s water supply.

One of the most frustrating issues is a sudden burst of cold water during a shower or soak. This issue is referred to as “cold water sandwich.” It’s usually caused by a pressure-balancing valve that opens or closes based on the flow of your plumbing system. To resolve this issue, make sure the valve is properly adjusted and perform regular maintenance, such as cleaning the inlet filter. You should also consult your water heater’s owner manual for more troubleshooting tips.

Low Water Pressure

Tankless water heaters are a great way to save energy by heating your water only when it is needed, but they can have issues just like any other appliance. Understanding these problems can help you troubleshoot them and resolve them effectively.

One of the most common issues with tankless water heaters is low water pressure. This can be caused by a number of factors, including blockages in the plumbing system or inadequate water supply. It can also be a result of a clogged aerator or filter. To address this issue, simply unclog the aerator or filter by turning it off and then removing it from the faucet. Next, rinse the aerator or filter with hot water and scrub it clean with a brush. You can then replace the aerator or filter, which should restore water flow and pressure.

Another potential cause of low water pressure is a clogged heat exchanger. This can occur when mineral deposits build up and interfere with the heat regulation process. To resolve this problem, you will need to drain and flush the heat exchanger according to the manufacturer’s instructions.

A blocked exhaust can also inhibit proper ventilation and lead to carbon monoxide buildup, which is a serious safety concern. To prevent this from happening, make sure there is adequate gas pressure coming to the unit and that the gas valve is open. Also, check the venting system for obstructions and ensure that it is properly installed.

Finally, if the water heater is electric, check the power supply to determine whether it has been turned off or tripped. If so, reset the breaker or contact an electrician to fix the problem.


While some noise is normal for tankless water heaters, excessive noise can be a sign of an underlying issue. For example, humming or tickling sounds may be caused by fluctuations in water temperature and pressure, while crackling noises are common in gas water heaters due to burner condensation. If you hear jet engine-like noises, however, this is a serious problem that requires professional assistance.

One possible cause of these noises is that parts are loose, causing them to rattle and bang around inside the unit. This can be fixed by turning off the power to the tankless water heater and carefully inspecting it for loose components. If you find any, tighten them as much as possible. Another potential source of noise is a clogged air filter, which can be cleaned by following the manufacturer’s instructions for your unit.

You may also hear a tapping or ticking sound from heat traps and check valves. These are designed to encourage water flow in the proper direction and help prevent water backflow. If the noise is bothersome to you, it’s a good idea to replace the heat trap with a dielectric nipple to reduce the amount of ticking and tapping you hear.

Regular maintenance, including flushing out sediments, can also help reduce noise from your tankless water heater. In addition, it’s a good idea to consider installing soundproofing materials in the room where your tankless water heater is located to minimize noise levels. By being aware of these signs and seeking prompt repairs when needed, you can extend the life of your tankless water heater and ensure optimal performance. Contact us today to schedule an appointment for service!

Discolored Water

A common issue with tankless water heaters that require repair is discolored water. This can occur for a variety of reasons, including sediment or rust buildup. It can also occur if the hot water supply has been disrupted. If this happens, running the hot and cold faucets for a few minutes will usually clear up the problem. If the water is still discolored after a few minutes, it may be a sign that a gas leak has occurred. In this case, the best solution is to contact a professional plumber for safe, effective repairs.

Discolored water or unpleasant odors can also indicate the presence of bacteria in your tankless water heater. Flushing the unit can help eliminate these issues by removing minerals and impurities that have accumulated in the system. In some cases, the use of a water softener can further reduce mineral content, improving water quality and eliminating odors.

If the burner is failing to ignite, a number of troubleshooting steps can be taken. First, it is important to make sure that the gas valves are fully open. It is also recommended to clean the igniter and flame sensor using a brush or cloth. If these steps don’t work, it may be necessary to replace the components. In this case, it is important to consult the manufacturer’s instructions or a professional for guidance on replacement procedures.

Lastly, it is also important to check that the exhaust vents are clear of obstructions. Objects such as rats, birds, sticks, or dirt can block the flow of gas and cause the burner to fail to ignite. Performing an inspection of the exhaust pipes can often identify the source of the problem and help you find a quick, safe solution.


If your tankless water heater begins to produce discolored or unpleasant-smelling water, it’s a good idea to call a professional. These symptoms are often a warning sign that your unit has become contaminated with sediment or rust. Fortunately, you can usually resolve this issue by flushing the system. This involves disconnecting the water supply, opening the gas valve, and allowing the unit to flush for several minutes. You should also clean the burner and igniter regularly to prevent dirt from hindering ignition.

If you notice a rotten egg odor coming from your hot water, it’s likely a sign of hydrogen sulfide. The odor is produced by the sacrificial anode rod, which is typically made of magnesium or zinc, to attract corrosive minerals to it, thus preventing corrosion of the inner glass lining of the water heater. When the anode corrodes, it produces sulfuric acid that generates hydrogen sulfide.

The smell of rotten eggs may also be caused by stagnation in the water heater tank. This is often resolved by using a store-bought peroxide solution.

In electric tankless water heaters, the main electrical issues that can arise include power failure, tripped circuit breaker, and faulty heating element or burner. You can typically restore power to the unit by checking the circuit breaker and resetting it. You should also check the cold-water supply valve to ensure it’s open. If the water heater continues to fail, you should consult your user manual for further troubleshooting guidance. If you’re experiencing any of the above issues, contact us for a professional inspection and Tankless Water Heater Repair. Our service professionals can quickly and effectively identify the underlying cause of your water heater problems to ensure you’re getting consistent, high-quality hot water.