Tankless Water Heater Repair: Essential Tips for Homeowners

Tankless water heaters save space and energy, providing hot water on demand without a big tank taking up room. But like any appliance, they can have problems sometimes. The good news is that many common issues with tankless water heaters can be fixed easily following some basic troubleshooting steps.

In this post, we'll look at the main problems that can happen with tankless water heaters. We'll cover things like no hot water, low water pressure, and unusual noises. We'll also share tips on how to fix these issues to keep your system working well.

Understanding Tankless Water Heater Operation

Tankless water heaters provide hot water on demand without a storage tank, using heating elements to warm water as it flows through the unit.

Components and Functionality

Below are the main components of a tankless water heater:

• Water inlet pipe
• Flow sensor
• Heating elements (electric) or burner (gas)
• Heat exchanger
• Outlet pipe

When you turn on a hot tap, cold water enters the heater. The flow sensor detects water movement and activates the heating elements or burner. As water passes through the heat exchanger, it warms up quickly and the hot water exits through the outlet pipe to your faucet or appliance.

Gas units have a few extra parts like a gas valve and venting system, while electric models rely on powerful heating elements to heat water fast.

Safety Precautions and Maintenance Tips

• Set the temperature no higher than 120°F to prevent scalding
• Keep the area around the unit clear of flammable items
• Check for leaks regularly
• Have a pro inspect gas units yearly

Flush the system every 6-12 months to remove mineral buildup as this keeps efficiency high and extends the heater's life. Replace the inlet filter as needed and check the manual for other model-specific care tips.

Watch for issues like inconsistent temperatures or reduced flow and address problems quickly to avoid bigger repairs. With proper care, tankless water heaters can last 20+ years.

Common Issues and Troubleshooting

Tankless water heaters can face several problems that affect their performance. 

Error Codes and Diagnostic Procedures

When your tankless water heater displays an error code, it's telling you there’s a problem. Check your user manual to find out what each code means.

Common error codes include:

• E1: Ignition failure
• E2: Flame failure
• E3: Overheating

To troubleshoot:

1. Reset the unit by turning it off and on
2. Check the gas or power supply
3. Clean the air intake filter

If the error persists, call a professional technician who can run more detailed tests to find and fix the issue.

Resolving Water Temperature Fluctuations

Cold water ‘sandwiches’ and sudden temperature changes can ruin your shower and these issues often stem from:

• Crossed hot and cold water lines
• Clogged showerhead or faucet aerator
• Faulty flow sensor

To fix this:

1. Check and clean your fixtures
2. Adjust the minimum flow rate setting
3. Install a small buffer tank
4. If you still have problems, the flow sensor might need replacing.

Dealing with Low Water Pressure and Flow Rates

Low water pressure can make your tankless heater less effective and it might even shut off if the flow is too low. Common causes include:

• Clogged inlet filter
• Mineral buildup in pipes
• Low water pressure from the main supply

Try these fixes:

1. Clean the inlet filter
2. Flush the system to remove scale
3. Check your home's main water pressure
4. Install a water pressure booster.

Addressing Noises and Odors

Weird noises or smells from your tankless heater aren't normal and often signal a problem that needs fixing quickly. 

Noises to listen out for:

• Clicking: Normal during startup, but shouldn’t be constant
• Whistling: Could be trapped air in the lines
• Banging: Possibly a surge of pressure (water hammers) or loose parts.

To fix noise-related issues, secure loose pipes and install water hammer arrestors. 

Smells to note:

• Rotten eggs: Possible gas leak (leave your home and the call gas company)
• Burning plastic: Electrical issue (turn off unit and call an electrician)

Regular Maintenance Procedures

Here’s an overview of key tasks like descaling, filter cleaning, and system inspections to prevent issues and extend your heater's lifespan.

Descaling and Removing Sediments

Descaling is crucial for tankless water heaters in areas with hard water and we recommend descaling every 6-12 months, depending on water hardness. 

Here's how:

1. Turn off the heater and close the water valves.
2. Connect a pump to the inlet and outlet.
3. Mix a descaling solution with water.
4. Run the solution through the system for 45-60 minutes.
5. Flush with clean water for 10 minutes.

For very hard water, consider installing a water softener to reduce scale buildup as this can improve efficiency and reduce the need for frequent descaling.

Filter Cleaning and Replacement

Clean or replace filters every 3-6 months to maintain water flow and quality. 

Follow these steps:

1. Shut off the water supply.
2. Remove the filter from the inlet.
3. Rinse with clean water to remove debris.
4. Check for damage or excessive buildup.
5. Replace if needed, or reinstall the cleaned filter.

Look for signs of clogged filters like reduced water flow or discolored water. Regular filter maintenance helps prevent sediment buildup and keeps your heater running at its best. 

Inspecting Gas and Water Supply Systems

Check gas and water connections every 6 months to ensure safe operation. 

1. Look for leaks around gas fittings. If you smell gas, call a professional immediately.
2. Test gas pressure to ensure it's within the manufacturer's specs.
3. Examine water supply valves for leaks or corrosion.
4. Check the pressure relief valve for proper operation.

Conduct visual inspections of the unit's exterior for signs of damage or wear and clean the ventilation system annually to prevent blockages, as they could affect performance or safety.

When to Seek Professional Help

Tankless water heater repairs can be complex and it’s good to know when to call in an expert and the advantages of professional assistance.

Identifying Complex Issues

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When to call a professional to fix your tankless water heater:

• If your tankless water heater has ignition failure or a malfunctioning thermostat.
• Gas supply issues or faulty flow sensors. 
• Loose components and mineral deposits.
• An unpleasant odor from your heater.

DIY repairs are tempting for initial savings, but they can cause more harm than good. If you're unsure about the problem or lack the right tools, it's safer to hire a professional.

Benefits of Hiring a Qualified Technician

A skilled technician brings knowledge and experience to fix your tankless water heater and they have special tools to diagnose and repair complex issues quickly. This saves you time and prevents costly mistakes.

Professionals can spot potential problems before they escalate while ensuring all repairs meet safety standards to provide peace of mind. Many also offer warranties on their work, protecting your investment.

Hiring an expert can save money in the long run as they fix the issue right the first time, preventing repeat problems. Plus, they can give tips to keep your heater running smoothly and efficiently.

Get in touch to arrange a professional inspection of your tankless water heater to fix any issues.