Tankless Water Heater Problems: When to Call for Service

If you’re having tankless water heater problems, there are a few basic things you can check before calling for service. Confirm that the unit has power, the gas and water supplies are on, the intake and exhaust vents are clear, and check the display for any error codes.

A reset following the manufacturer’s instructions may resolve a simple issue. However, if an error code keeps returning, your hot water is inconsistent, you notice a leak, or the unit begins making unusual noises, it is time to call a professional.

At Norm’s Plumbing, Heating and Air Conditioning, our technicians diagnose and repair tankless water heater issues ranging from recurring error codes and ignition problems to venting concerns and inconsistent hot water. Our certified gas technicians, including team members like Don, work on tankless systems every day and understand the common issues that affect homeowners across Mid-Vancouver Island.

What Should You Check Before Calling for Tankless Water Heater Repair?

Before scheduling tankless water heater service, it is worth checking a few common issues:

• Confirm the unit has power.
• Make sure the gas supply is on.
• Check that the water supply valves are open.
• Look for blocked intake or exhaust vents.
• Note any error codes.
• Try a system reset according to the manufacturer’s instructions.

Sometimes the solution is simple. If the problem continues or quickly returns, however, further troubleshooting may require a professional.

When Does Tankless Water Heater Troubleshooting Become a Service Call?

Recurring Error Codes

If an error code keeps returning after a reset, there is likely an underlying issue that needs to be diagnosed.

However, not every code indicates a system failure. For example, Code 55 on a Rinnai tankless water heater is an annual service reminder rather than an error. It indicates that the unit is due for professional maintenance, including inspection and flushing.

Repeatedly resetting the unit typically will not solve the problem and may allow the issue to worsen. Make a note of the error code so you can share it with your technician when you call.

Inconsistent Hot Water

Is your shower suddenly going from hot to cold? Does the water temperature fluctuate throughout the day?

Inconsistent hot water can indicate issues with sensors, flow rates, gas pressure, or internal components that require professional service.

If the temperature continues to fluctuate, it is time to have the system inspected.

Water Leaks

If you notice water around your tankless water heater, do not ignore it.

Even a small leak can lead to water damage and may signal a larger problem inside the system. A technician can determine where the water is coming from and what needs to be repaired.

Unusual Noises

Tankless water heaters normally operate quietly.

Rumbling, banging, whistling, or excessive clicking may indicate mineral buildup, flow restrictions, or component wear.

If your unit suddenly sounds different than it normally does, especially if the noise is accompanied by other performance issues, schedule service.

Rising Utility Bills

If your tankless water heater is not operating efficiently, scale buildup or other performance issues may be causing it to work harder than necessary.

Professional maintenance can often restore efficiency and help lower operating costs.

Your Tankless Water Heater Has Not Been Professionally Maintained

A common misconception is that tankless water heaters do not need maintenance.

Regular flushing and inspections help prevent scale buildup and extend the life of the system. If your unit has not been serviced in several years, it is a good idea to schedule an inspection.

Should You Keep Resetting a Tankless Water Heater?

A reset may solve a simple or temporary issue when it is completed according to the manufacturer’s instructions.

However, if the same error code or performance problem keeps returning, repeatedly resetting the system is not a long-term solution.

A recurring problem usually means there is an underlying issue that needs to be diagnosed.

Do Tankless Water Heaters Need Regular Maintenance?

Yes. Tankless water heaters still need regular maintenance.

Regular flushing and inspections can help prevent scale buildup, keep the system operating efficiently, and identify small concerns before they become larger problems.

If your tankless water heater has not been serviced in several years, scheduling an inspection is a good way to help keep the system running reliably.

Don’t Wait Until You Have No Hot Water

Many major repairs start as minor symptoms, including occasional error codes, temperature fluctuations, or unusual noises.

These issues can be easy to ignore at first, but addressing them early may help prevent larger and more expensive breakdowns later.

If the same symptom keeps coming back, it is better to have the unit inspected than to wait until it stops producing hot water completely.

Prevent Future Problems With Regular Maintenance

At Norm’s Plumbing, Heating and Air Conditioning, we help homeowners stay ahead of unexpected repairs with our monthly maintenance memberships.

Regular inspections and preventative maintenance can help keep your tankless water heater running efficiently while identifying small concerns before they become major problems.

As a family-owned company serving Nanaimo, Parksville, Qualicum Beach, Ladysmith, Lantzville, and surrounding Mid-Vancouver Island communities, we believe preventative maintenance is one of the best investments you can make in your home’s comfort and reliability.

Frequently Asked Questions

Why does my tankless water heater keep showing an error code?

If the same error code returns after a reset, there is likely an underlying issue that needs to be diagnosed. Make a note of the code and contact a professional rather than continuing to reset the unit.

Why does my tankless water heater keep going hot and cold?

Temperature fluctuations can indicate issues with sensors, flow rates, gas pressure, or internal components. If the problem continues, schedule professional service.

Does a tankless water heater need maintenance?

Yes. Regular flushing and inspections help prevent scale buildup and can help extend the life of the system.

When should I stop troubleshooting my tankless water heater?

If you have confirmed the unit has power, the gas and water supplies are on, the vents are clear, and a manufacturer-recommended reset does not solve the problem, it is time to call a professional.

Recurring error codes, inconsistent hot water, leaks, or unusual noises are also signs that the system may need professional service.

Tankless Water Heater Service in Nanaimo and Mid Vancouver Island

If you have tried the basic troubleshooting steps and your tankless water heater still is not performing properly, it is time to bring in the professionals.

Norm’s Plumbing, Heating and Air Conditioning provides tankless water heater service throughout Nanaimo, Parksville, Qualicum Beach, Ladysmith, Lantzville, and surrounding Mid-Vancouver Island communities.

Our technicians can diagnose recurring error codes, ignition problems, venting concerns, inconsistent hot water, leaks, unusual noises, and other performance issues.

Call Norm’s Plumbing, Heating and Air Conditioning at 250-753-3641 or schedule a service. From our family to yours, we will help get your hot water back on and keep your tankless system running reliably.