4 Killer Tips for Troubleshooting Tankless Water Heater Problems

If you like saving energy bills and doing cost cutting, troubleshooting tankless water heater problems could put you on a competitive edge for a remarkable performance.

These heaters are popular options for those who want a tank that doesn’t have to store hot water but pass it to a specific target reservoir on demand. Remarkably, they are easy to use.

However, you need to know how to go about simple maintenance. You don’t have to call a technician to do the fixing all the time.

This review helps you understand troubleshooting your tankless water heater problems. You will save time, and resultantly minimize or do away with repair and replacement costs in the long run.

Related: How important is the maintenance of tankless water heaters

Common Tankless Water Heater Problems

The most common or potential tankless water heater problems you are likely to notice in your tank include:

  • Overheating or not water not achieving the required temperature
  • A faulty flame or ignition
  • Thermal fuse malfunction
  • Irregular temperature fluctuation
  • System overload
  • Irregular air supply
  • Low water pressure
  • Tank burner becomes noisy or doesn’t burn
  • Mineral clogging plus many others

However, you can able to solve some of these challenges effectively depending on the kind of tankless model you have. Most of the modern designs come with self-diagnostic and problem-solving capability, thanks to smart electronic circuit boards and computer chips.

This implies you can do the fixing all by yourself or in exceptional cases call a qualified technician to repair it. In addition, it is important to understand the tanks manual for easy usage.

See also: Tankless Water Heater Easy Repair

What do you expect in your tank and how do you troubleshoot any problem?

If you buy a well-designed tankless water heater, it is likely to come with advanced features that may highlight any possible failure or problem.

In fact, your unit will indicate an error code or flashing light, normally visible in its body design or a remote controller for any potential problem. If you come across this, you don’t want to operate a tankless water heater without these tips.

Tip 1: Irregular air supply

If your tankless water heater indicator points out a problem with the exhaust system, it is imperative to check the air supply or venting. This will help establish whether the vent pipes could be having a problem or not. Check whether there is any kind of gas leakage.

Remember, sometimes this might not be clearly visible but if you smell any gas, chances are there is probably a small invisible hole leaking the gas.

If you can clearly identify where this gas is coming from, sealing of the hole should be done or if you are a newbie into these tanks, call in your technician to do it for you.

Tip 2: Water mineral clogging

Most water heater tanks are likely to develop mineral clogging because water itself has a lot of minerals like magnesium, calcium, and others that end up building up over time inside the tank unit.

Hence, this is why it should be a regular practice for you to flush or descale the unit plus regularly cleaning the waterways to avoid blockages. This can be done more often annually.

Worried about how to know when and how to flush your tank? Well, most modern tanks have sensors that automatically detect the buildup and will indicate when it is time to do the flushing. However, it is always advisable to use water softeners to help minimize the mineral buildup

Related: Top-Quality Tankless Water Heaters

Tip 3: Is your water temperature fluctuating?

If this is happening, it is vital to check how water is flowing throughout the tankless water heater.  A significant amount of water needs to flow through the unit before proper heating takes place.

The taps should be open running with no obstructions in the pipes delivering the water to the unit. A quick check on your thermostat settings could also be appropriate. If the setting isn’t correct, this could be altering the temperature level expected.

Ensure you adjust it appropriately. Notably, a manual could be helpful at this point if you are not sure of its features. Check whether the temperature is set too high for adjustment to avoid instances of scorching

Secondly, it is important to check the water pressure of your tankless water heater as this might be causing the water temperature variability.

If you don’t have the technical know-how on how to fix this, consider calling in your plumber to help do the repair and any other potential problem.

What if your tank doesn’t produce any hot water? Try checking the electric power, water, and gas supply if it is stable. This includes your burner and flame rod.

Remember whether there could be a problem that might be contributing to the problem. This could be displayed in the unit.

Furthermore, temperature issues could be connected to faulty sensors. If your temperature sensor is broken, do a quick check of its positioning by either re-positioning it or doing a complete replacement with a new one, especially if it has problems.

Related article: Choose Gas or Electric Tankless Water Heater

Tip 4: The tankless water heater is loud

This can be annoying if silence is what you need around but some models can be negligibly less noisy. However, is this is becoming a major concern; chances are the fan could have collected a lot of dust and other debris.

You can use a blower to clear away the dust or open the fan compartment and clean it carefully before replacement.

In most cases, the gas should be burning with a clear light blue flame possibly because of irregular gas combustion.  Additionally, an unstable burner could result in inappropriate venting or poor air combustion.

Related: Easy cleaning of tankless water heater


If the fan motor continues to spin after the water stops heating, this should not be taken as unusual. The fan motor is designed in such way that it has to continue running for some extra seconds in order to do away with exhaust gases that might be stuck in the venting system.

Unless inevitable, it is always ideal to keep the water flow at the minimum. You now realize some of these problems don’t need a technician right? I hope you will now get your tankless water heater running smoothly without getting stuck with basic troubleshooting next time it develops a problem. Don’t you think?

See also: Advantages and disadvantages of tankless water heaters