Tankless water heaters are a popular choice for their energy efficiency and endless hot water supply, but they can also come with their own set of problems. From mineral buildup to ignition failure, troubleshooting these issues can be daunting. But fear not! In this comprehensive guide, we’ll walk you through the most common tankless water heater problems and provide easy fixes to recharge your hot water.
No Hot Water Issues
If you turn on your hot water faucet and nothing but cold water comes out, you may be experiencing a no-hot water issue with your tankless water heater. This can be frustrating and inconvenient, especially if you rely on warm water for daily tasks like bathing, washing dishes, or laundry.
Fix #1: Check for Power Supply
First, check to ensure your tankless heater receives power. If it’s an electric unit, check that the circuit breaker hasn’t tripped. For a gas unit, ensure the gas supply valve is open and the pilot light is lit.
Fix #2: Check the Water Supply
Another common reason for no hot water is a problem with the water supply. Check to ensure the water supply valve is open, and there is no blockage in the pipes. If the water supply is blocked, you may need to call a plumber to fix the issue.
Fix #3: Check the Heating Element or Burner
If the heating element or burner is faulty, it can cause a no-hot water issue. Check to ensure the part or burner is clean and debris-free. If it’s dirty, clean it with a soft brush and some water. If it’s damaged or worn, it may need to be replaced.
Overheating Issues
If your tankless water heater produces water that is too hot, it can be uncomfortable and dangerous. There are a few different reasons why this might be happening.
Fix #1: Check the Temperature Setting
The first thing to check is the temperature setting on your tankless water heater. Make sure it’s set to a safe and appropriate temperature, typically around 120 degrees Fahrenheit to prevent scalding.
Fix #2: Check the Thermostat
The problem may be with the thermostat if the temperature setting is correct. Check the thermostat and make sure it’s functioning correctly. If it’s malfunctioning, it may need to be replaced.
Fix #3: Check for Scale Buildup
Another possible cause of boiling water is scale buildup inside the unit. Scale buildup can cause the water to heat too much and damage the heater over time. If you suspect scale buildup, consult a professional to have the unit cleaned.
Low Water Pressure Problems
Low water pressure can be a frustrating issue with tankless water heaters, causing slow or weak water flow that can affect the performance of your unit.
Fix #1: Clean the Aerator
The first possible reason for low water pressure is a clogged aerator. The aerator is the small screen located at the end of the faucet. Over time, it can become clogged with sediment or debris, affecting water flow.
Fix #2: Clean the Water Filter
If the water filter in the unit is clogged, it can restrict water flow and cause low pressure. Turn off the water supply, remove the filter, and rinse it under running water to clean it.
Fix #3: Check the Water Pressure Regulator
The water pressure regulator is a valve that controls the pressure of the water entering your home. If the regulator is set too low, it can cause low water pressure throughout your home, including your tankless water heater. Consult a professional to adjust the regulator if necessary.
Noisy Operation
Tankless water heaters are known for their quiet operation, but if your unit makes unusual noises, it can cause concern.
Fix #1: Tighten Loose Components
If you suspect a loose part is causing the noise, turn off the power to the unit and inspect the components. Tighten any loose screws or connections that you find. If you’re not comfortable doing this, consult a professional.
Fix #2: Flush the Unit
To remove sediment or scale buildup, flush the unit according to the manufacturer’s instructions. This typically involves turning off the power and the water supply and connecting a hose to the unit’s flush valve.
Fix #3: Check the Gas Pressure
If the noise is related to a gas issue, check the gas pressure to ensure it’s within the manufacturer’s recommended range. If it’s not, consult a professional to adjust the gas pressure.
Discolored Water and Odor Issues
If your tankless water heater produces discolored water or an unpleasant odor, it can be a sign of a problem.
Fix #1: Flush the Unit
Flushing the unit can help remove sediment and rust buildup, improving water quality. To flush the heater, turn off the power and water supply, and connect a hose to the unit’s flush valve.
Fix #2: Use a Water Softener
If your water is hard, it can contribute to a sediment buildup in the unit. Consider installing a water softener to reduce the hardness of your water.
Fix #3: Use a Chlorine Treatment
If bacteria growth is causing the odor, consider using a chlorine treatment to disinfect the unit. Consult a professional to determine the appropriate treatment and dosage for your heater.
Ignition Failure
It can be both frustrating and risky if the burner of your tankless water heater fails to ignite. There could be numerous reasons behind this issue.
Fix #1: Check the Gas Supply
Ensure that the gas supply to the unit is turned on and that there are no leaks in the gas line. If the gas supply is on and there are no leaks, check the gas pressure to ensure it’s within the manufacturer’s recommended range.
Fix #2: Clean the Igniter and Flame Sensor
Dirt, debris, or corrosion can affect the performance of the igniter and flame sensor. Use a soft brush or cloth to clean these components and remove any buildup.
Fix #3: Replace the Igniter or Flame Sensor
If cleaning the igniter or flame sensor does not solve the problem, it may need to be replaced. Consult the owner’s manual or a professional to determine the appropriate replacement parts.
Temperature Fluctuations
It can be troublesome if your tankless water heater is not maintaining a steady water temperature. The cause for this could be a blocked filter, which hinders water movement and disrupts the appliance’s performance.
Fix #1: Clean the Filter
To clean the filter, turn off the power and water supply to the unit, and remove the filter. Rinse it under running water and use a soft brush to remove debris or sediment.
Fix #2: Adjust the Temperature Setting
If the temperature setting is not the issue, adjust the temperature setting on the unit. Consult the owner’s manual for instructions on how to do this.
Fix #3: Replace the Thermostat or Temperature Sensor
If the temperature setting and filter are not the issues, the thermostat or temperature sensor may be malfunctioning and need replacement. Consult a professional to diagnose and replace these components if necessary.
Leaks
If your tankless water heater is leaking, it can be a severe predicament that must be attended to promptly. A few underlying reasons can explain this situation, such as a loose connector or a damaged water pipe.
Fix #1: Turn Off the Water Supply
If you notice a leak, turn off the water supply to the unit immediately to prevent further damage. Then seek professional help to get it fixed.
Fix #2: Inspect the Unit
Inspect the unit and surrounding area for visible signs of damage or corrosion. Tighten any loose connections or fittings that you find. If the water line is damaged or corrupted, consult a professional to have it replaced.
Fix #3: Check for Condensation
In some cases, what appears to be a leak may be condensation. Check the unit for signs of condensation, such as moisture on the outside of the heater. If it is condensation, there is likely no cause for concern.
Remember, if you’re not comfortable troubleshooting any of these issues, it’s always best to call a qualified plumber or heating technician from DD Plumbing and Heating to properly diagnose and repair your tankless water heater. Their expertise can ensure your hot water is flowing again quickly and safely.
