COMMON TROUBLESHOOTING TANKLESS WATER HEATER PROBLEMS AND FIXES

Troubleshooting tankless water heater problems

Dealing with cold showers and waiting forever for your tankless water heater to warm up can make anyone cringe. You are not alone in this struggle. 

Though tankless water heaters are a popular choice due to their energy efficiency and endless hot water supply, they come with a set of problems that can be quite daunting. Mineral buildup, ignition failure, and other issues often require troubleshooting, making it seem overwhelming. ​

However, with this comprehensive guide focusing on 10 common problems and their easy fixes, you can recharge your hot water supply. Say goodbye to chilly mornings and hello to a relaxing shower. Dive into this guide, and transform your mornings.

COMMON TANKLESS WATER HEATER ISSUES AND THEIR FIXES

Tankless water heaters are fantastic for providing hot water on demand, but like any appliance, they can run into problems. If you're dealing with a troublesome tankless water heater, don't worry. This guide will help you understand and fix common issues. Think of this guide as your personal mechanic for your water heater, making those frustrating cold showers a thing of the past.

Sr#	Headings
1	​NO HOT WATER​
2	​INCONSISTENT WATER TEMPERATURE
3	​LOW WATER PRESSURE
4	​THE UNIT IS TOO NOISY
5	​DISCOLORED WATER AND AN UNPLEASANT ODOR
6	​​ THE BURNER DOESN'T IGNITE
7	WATER TEMPERATURE FLUCTUATION
8	THE TANKLESS WATER HEATER IS LEAKING
9	​MAINTENANCE TIPS
10	CONTACT AC REPAIR BURKE FOR A PROFESSIONAL FIX TO YOUR TANKLESS WATER HEATER
11	CONCLUSION
12	FAQ's

1. NO HOT WATER

​When you turn on your hot water faucet and only get cold water, it’s a clear sign of a no-hot water issue with your tankless water heater. This situation is particularly frustrating and incredibly inconvenient, especially when you depend on warm water for essential daily tasks like bathing, washing dishes, and doing laundry. I remember once facing this problem right before an important family dinner, and it disrupted everything.

To address this, first check if the heater is getting power. Often, a simple reset can solve the issue. Ensure the gas supply is uninterrupted and the water filter is clean. These small checks can save you from bigger headaches and keep your tankless water heater running smoothly.

SOLUTIONS TO FIX

Solution 1. Examine the Power Supply

When you face the frustrating issue of no hot water, the first step is to ensure your tankless heater is receiving power. If you have an electric unit, check the circuit breaker to see if it has tripped. For a gas unit, confirm that the supply valve is open and the pilot light is lit.

Solution 2. Examine the Water Supply

Another common reason for this problem could be the water supply. Ensure that the water supply valve is open and there are no blockages in the pipes. If the water supply is blocked, it may be necessary to call a plumber to fix the issue.

Solution 3. Examine the Heating Element or Burner

​Additionally, a faulty heating element or burner can cause this problem. Inspect these parts to see if they are clean and debris-free. Use a soft brush and some water to clean them if they are dirty. If the heating element or burner is damaged or worn, it will need to be replaced.

2. INCONSISTENT WATER TEMPERATURE

When dealing with a tankless water heater that is producing too hot water, making it uncomfortable and even dangerous, there are several reasons why this could be happening. The cause might be that the unit's temperature is set too high.

​To address this, start by checking the setting and adjust if necessary. A potential issue could be a malfunctioning thermostat. If it’s not functioning correctly, it may need to be replaced. Ensuring these elements are working well can help maintain safe and comfortable water temperatures.

Solutions to Fix

Solution 1. Examine the Temperature Setting

​​If you're experiencing no hot water with your tankless water heater, the first thing you should check is the temperature setting. Ensure it's set to a safe and appropriate level, typically 120 degrees Fahrenheit, to prevent scalding. 

Solution 2. Examine the Thermostat

If the temperature is set correctly, the issue might be with the thermostat. Verify if the thermostat is functioning properly; a malfunctioning thermostat may need to be replaced. 

Solution 3. Examine for Scale Buildup

Another possible issue could be scale buildup inside the unit. Scale buildup can cause the water to heat improperly and damage the system over time. If you suspect scale buildup, it's advisable to consult a professional to have the unit thoroughly cleaned.

3. Low Water Pressure

​Experiencing no hot water from your tankless water heater can be quite frustrating. One common issue that might be causing this problem is low water pressure. This can lead to slow or weak flow, which impacts the overall performance of your unit.

​There are several reasons for low water pressure, but a clogged aerator is a frequent culprit. The aerator, a small screen located at the end of your faucet, can become clogged over time with sediment or debris, affecting the water flow. Another possible reason is a clogged filter within the unit. If the filter is clogged, it can restrict the water flow and cause low pressure. Ensuring these components are clean and clear can help restore proper function to your water heater.

Solutions to Fix

Solution 1. Clean the Aerator

Having no hot water can be incredibly frustrating, especially when you're relying on a tankless system for your daily needs. One common fix is to clean the aerator. This is a small part that can get clogged with debris and sediment, reducing water flow. To clean it, simply unscrew the aerator from the faucet and rinse it under running water. If needed, use a small brush to scrub away any buildup, then reattach it to the faucet.

Solution 2. Clean the Water Filter

Another crucial step is to clean the water filter. Turn off the water supply to the unit and remove the filter. Rinse it under running water and use a soft brush to remove any debris or sediment. Reattach the filter and turn the water supply back on.

Solution 3. Check the Water Pressure Regulator

If you still experience issues, it might be worth checking the water pressure regulator. This valve controls the pressure of the water entering your home. If the pressure is too low, it can cause issues with your tankless water heater. In such cases, consult a professional to adjust the regulator.

4. THE UNIT IS TOO NOISY

​If you've ever faced the frustrating problem of no hot water from your tankless water heater, you know how concerning it can be. Based on my experience, one of the first things to check is whether the unit is firmly fixed. Loose components can cause banging and clattering sounds, which might indicate an internal issue affecting the heater's operation.

Another potential cause of no hot water is the accumulation of sediment or scale within the unit. This buildup can lead to a popping or hissing sound as the water heats up, signaling that maintenance is overdue. It's essential to regularly check and clean your tankless water heater to prevent these issues. Over time, these noises and problems can escalate, causing more severe damage to the water heater. By addressing these concerns promptly, you can ensure a more efficient and quieter operation of your tankless water heater.

Solutions to Fix

Solution 1. Tighten Loose Components

If your tankless water heater is making too much noise, it might be because of loose parts. Start by turning off the power to the unit and inspect all the components. Tighten any loose screws or connections you find. If you are not comfortable doing this, it's best to consult a professional.

Solution 2. Flush the Unit

Another common cause of noise is sediment or scale buildup inside the unit. To fix this, flush the unit following the manufacturer's instructions. This usually involves turning off the power and the water supply, then connecting a hose to the flush valve. Open the gas valve and let the unit flush for several minutes.

Solution 3. Examine the Gas Pressure

If the noise is due to a gas issue, you should check the gas pressure to make sure it's within the manufacturer's recommended range. If it's not, you'll need to consult a professional to adjust the gas pressure.

5. DISCOLORED WATER AND AN UNPLEASANT ODOR

If your tankless water heater starts to produce discolored water or has an unpleasant odor, it's likely a sign of a problem. In my experience, such issues can often be traced back to rust or sediment buildup in the unit. Rust forms when metal parts inside the heater corrode over time, leading to discolored water. Similarly, sediment buildup can occur from minerals in the water, which not only affects the water quality but can also reduce the efficiency of your heater. An unpleasant odor is typically caused by bacteria growth within the system.

Solutions to Fix

​Solution 1. Flush the Unit

Flushing your tankless water heater can help remove sediment and rust buildup, significantly improving water quality. To do this, turn off the power and water supply, then connect a hose to the unit's flush valve. Open the valve and let the unit flush for several minutes. This process helps to clear out any sediment that may have accumulated.

Solution 2. Use a Water Softener

If you have hard water, it can contribute to sediment buildup in your unit. Installing a water softener can help reduce the hardness of your water, preventing sediment from forming and extending the lifespan of your heater.

Solution 3. Use a Chlorine Treatment

If bacteria growth is causing an odor, consider using a chlorine treatment to disinfect the unit. This will help eliminate the bacteria and improve the smell of your water. It's best to consult a professional to determine the appropriate treatment and dosage for your specific heater model.

6. THE BURNER DOESN'T IGNITE

When dealing with burner issues in a tankless water heater, it can be both frustrating and risky if it fails to ignite. There could be numerous reasons behind this issue. One potential cause is that the unit is not getting a sufficient gas supply. Another possibility is a malfunctioning igniter or a flame sensor. These parts might also have their efficiency hampered by the accumulation of dirt, debris, or corrosion. From my personal experience, ensuring that the gas supply is uninterrupted and regularly cleaning the igniter and sensor can prevent these problems. Always check for any signs of debris or dirt that might block the burner. Regular maintenance can keep your tankless water heater running smoothly.

Solutions to Fix

Solution 1. Check the Gas Supply

If your tankless water heater isn't igniting, it can be a real inconvenience. Start by making sure the gas supply to the unit is turned on and check for any leaks in the gas line. Even if everything seems okay, it's crucial to verify that the gas pressure is within the manufacturer's recommended range.

Solution 2. Clean the Igniter and Flame Sensor

​Next, consider the igniter and flame sensor. Over time, these components can become clogged with dirt, debris, or corrosion, which can impair their performance. To address this, use a soft brush or a cloth to clean them and remove any buildup.

Solution 3. Replace the Igniter or Flame Sensor

​If cleaning the igniter and flame sensor doesn't resolve the issue, they may need to be replaced. Look at your owner's manual or consult a HVAC professional to determine the appropriate replacement parts. Following these steps will help ensure your water heater functions properly without ignition issues.

​7. Water Temperature Fluctuation

When dealing with troublesome issues related to a tankless water heater, one common problem is steady temperature maintenance. From my experience, the culprit is often a blocked filter. This blockage can hinder water movement, leading to disrupts in the appliance's performance. Another cause could be a faulty thermostat or temperature sensor. These components might malfunction over time and require replacement to resolve the issue.

Solutions to Fix

Solution 1. Clean the Filter

• Turn off the power and water supply to the unit.
  
• Remove the filter.
  
• Rinse the filter under running water, using a soft brush to remove any debris or sediment.
  
• Once the filter is clean, reattach it.
  
• Turn the power and water supply back on.

Solution 2. Adjust the Temperature Setting