Aaron Services repairs and maintains tankless water heaters in Duluth, GA, including systems with error codes, ignition failures, temperature fluctuations, reduced hot water flow, scale buildup, and other performance problems. Our plumbers have experience troubleshooting Rinnai, Navien, and other tankless equipment and can determine whether a malfunction calls for repair, maintenance, or a conversation about replacing an older system. We can often book appointments the same day you call and are certified to assist with warranty issues.
A tankless water heater can give you years of dependable hot water, but diagnosing one isn’t always as simple as replacing the part associated with an error code. The unit depends on proper water flow, gas delivery, combustion, venting, sensors, controls, and other components working together. When something changes, we look at the system as a whole to find out why.
Common Tankless Repair Needs
Tankless problems don’t all look the same. Some units stop producing hot water completely. Others work most of the time but occasionally turn cold, display an error code, make an unusual sound, or struggle when more than one fixture is running.
The details matter when troubleshooting a tankless water heater. Before you call, it can be helpful to notice:
- Whether you have no hot water or only intermittent hot water
- Any error code shown on the display
- Whether the problem affects every fixture or only one
- Whether it happens when multiple fixtures use hot water
- Whether the unit attempts to start and then shuts down
- Any unusual noises
- Approximately when the system was last flushed or serviced
- The manufacturer and approximate age of the unit, if known
Don’t worry if you don’t know all of that. You don’t need to troubleshoot the system yourself. Even one or two details can give our plumber a useful starting point.
One of the advantages of modern tankless equipment is its ability to recognize abnormal operating conditions and display an error code.
That code can narrow down the problem, but it doesn’t necessarily mean the component named or associated with the code has failed.
For example, a combustion or ignition-related code could require looking at several conditions that allow the unit to operate properly. Flow-related problems can have more than one possible cause as well.
That’s why simply clearing a code or repeatedly resetting the water heater isn’t the same as diagnosing it.
If your unit is showing a code, leave it displayed if possible or take a photo before resetting the system. Our plumber can use that information as part of the diagnosis.
Hot Water That Suddenly Turns Cold
A tankless system that produces hot water and then suddenly goes cold can be particularly frustrating because the unit obviously can heat water—it just isn’t doing so consistently.
The timing of the problem can help narrow down what’s happening.
Does the temperature change when another shower starts? Does it happen at one faucet but not another? Does the water heater shut itself down? Does an error code appear at the same time?
Possible causes can involve flow through the unit, system demand, scale accumulation, sensors, controls, combustion, or other operating conditions. Instead of assuming the system is undersized or failing, we’ll look at the circumstances surrounding the temperature change.
When the Water Heater Works — Until Everyone Needs Hot Water
Tankless water heaters don’t store a fixed number of gallons, but they still have limits.
Each system can raise the temperature of a certain volume of water at a given time. When several showers, faucets, or appliances request hot water simultaneously, demand can exceed what a particular unit can deliver under those conditions.
If your tankless has always struggled when multiple fixtures are running, the original sizing or installation may be worth evaluating.
If it used to handle the same demand without a problem, that’s different. A noticeable change in performance can point toward a service or maintenance issue rather than simply capacity.
That distinction can prevent you from trying to solve the wrong problem.
Tankless water heaters don’t store dozens of gallons of water, but minerals can still accumulate where water passes through the system.
Over time, scale can build up inside the heat exchanger and affect water flow and heat transfer. Regular flushing helps remove these deposits before accumulation becomes more significant.
How often a system needs service can depend on water conditions, usage, equipment, and manufacturer recommendations.
Aaron Services provides professional tankless water heater flushing in Duluth. Maintenance can also give us an opportunity to notice signs of other developing problems while we’re working with the system.
Can a Flush Fix a Tankless Water Heater Problem?
Sometimes maintenance is exactly what a poorly performing unit needs. Other times, flushing doesn’t address the actual cause of the malfunction.
If you’re calling because your tankless water heater is already displaying an error code, shutting down, or failing to produce hot water reliably, tell us about the symptom rather than simply requesting a flush.
That way, we’re approaching the visit as a troubleshooting problem instead of assuming maintenance alone will solve it.
A malfunction doesn’t automatically mean your tankless water heater is finished.
Depending on what we find, the problem may involve a serviceable component or condition rather than the entire unit. The age of the equipment, overall condition, repair history, parts availability, and cost of the repair all matter when deciding what to do next.
Our plumbers have experience servicing Rinnai and Navien tankless water heaters, the brands we most commonly install, as well as other tankless equipment.
And Aaron Services doesn’t need to have installed your system originally. If another contractor installed it—or the tankless was already there when you bought the house—we can still evaluate it.
What If the Installation Is Part of the Problem?
Tankless water heaters depend on more than the appliance hanging on the wall.
Gas supply, venting, water flow, piping, condensate handling where applicable, and equipment sizing can all influence how the system operates. An installation issue can sometimes show up immediately, but other problems may become more noticeable under certain operating conditions.
If troubleshooting points beyond a failed component, we’ll explain what we’re seeing and how it may be affecting the system.
That doesn’t mean every tankless problem is an installation problem. Normal wear, maintenance needs, component failures, and other issues can develop even with properly installed equipment.
Repairing an Older Tankless Water Heater
Age alone doesn’t determine whether a tankless water heater should be replaced.
If an older unit develops a problem, we’ll consider what failed, the overall condition of the equipment, whether parts are available, the repair cost, and whether the system has developed a pattern of recurring problems.
Sometimes repairing the existing unit is reasonable. Sometimes putting substantial money into an aging system doesn’t make as much sense.
If replacement enters the conversation, we’ll explain why rather than treating it as the automatic answer.
Aaron Services also provides tankless water heater installation when a new system is the better choice.
Tankless doesn’t mean maintenance-free.
Periodic service can help control mineral accumulation and gives the system an opportunity to be checked before a small change in performance becomes an inconvenient loss of hot water.
Maintenance needs vary, so we don’t believe every unit should be treated identically. The manufacturer’s recommendations, water conditions, household usage, equipment age, and service history can all influence what makes sense.
If you don’t remember the last time your tankless water heater was serviced, we can evaluate its current condition and recommend an appropriate maintenance schedule going forward.
Rinnai and Navien Tankless Service
Rinnai and Navien are two of the tankless brands our plumbers encounter most often, and they’re also the brands Aaron Services most commonly installs.
Working regularly with tankless equipment matters because these systems are more complex than conventional tank water heaters. Error histories, operating conditions, manufacturer-specific components, and the interaction between the unit and the home’s plumbing and gas systems can all be relevant to a diagnosis.
Whether you have a Rinnai, Navien, or another manufacturer, start with the symptom you’re experiencing. We’ll determine what needs to be checked from there.
What Duluth Homeowners Say About Aaron Services
When a tankless water heater stops working, good service involves more than getting the hot water back on. Clear communication about what failed, what the repair involves, and what it will cost matters too.
See what customers say about their experience with Aaron Services:
FAQ: Tankless Water Heater Queries Answered for Duluth Customers
Why is my tankless water heater showing an error code?
An error code indicates that the system detected an abnormal operating condition. The specific meaning depends on the manufacturer and code. Because more than one underlying condition can sometimes lead to a particular code, troubleshooting may still be necessary before deciding what needs to be repaired.
Why does my tankless water heater get cold during a shower?
A sudden temperature change can be related to water flow, simultaneous hot water demand, scale buildup, controls, sensors, or another operating problem. Whether the issue happens at one fixture or throughout the house—and whether it is new or has always happened—can help with diagnosis.
Should I reset my tankless water heater when it shows an error?
A reset may restore operation in some situations, but it doesn’t explain why the error occurred. If the same code returns or the unit repeatedly shuts down, the underlying cause should be investigated.
How often should a tankless water heater be flushed?
The appropriate maintenance interval can vary based on manufacturer recommendations, water conditions, household usage, and the equipment itself. If you aren’t sure when yours was last serviced, a plumber can evaluate the system and recommend an appropriate maintenance schedule.
Can you repair a tankless water heater you didn’t install?
Yes. Aaron Services can diagnose and service existing tankless water heaters even when another company performed the original installation.
Is it better to repair or replace an older tankless water heater?
It depends on the specific failure, equipment age and condition, repair history, parts availability, and repair cost. An older unit doesn’t automatically need replacement. We can evaluate the existing system and explain both options when appropriate.
Plumbing and Water Heater Service in Duluth
A hot water problem isn’t always isolated to the water heater. Water pressure, piping, fixtures, and other parts of the plumbing system can sometimes affect what you’re experiencing.
Aaron Services provides complete plumbing service in Duluth in addition to tankless repair, including traditional water heater service, leak detection and repair, drain and sewer service, water line repairs, pressure reducing valves, fixtures, and other plumbing repairs.
Whether your problem starts at the tankless unit or somewhere else in the system, our plumbers can help determine what’s happening and what it will take to correct it.
Facebook 
Trustindex 
