Navien tankless water heaters are highly efficient and durable, providing hot water on demand and saving energy. However, like any other appliance, they may develop some problems that need to be repaired after some time. It is crucial to identify the signs of deterioration early on to prevent having to repair or replace the equipment at a much higher cost and ensure proper performance. In this article, we will discuss some of the signs that your Navien tankless water heater needs some attention so that you can take the necessary measures to keep it running efficiently.
Signs That Your Navien Tankless Water Heater Needs Repair
Here are the signs that your Navien tankless water heater may need repair:
1. Inconsistent or Insufficient Hot Water Supply
Inconsistent or insufficient hot water is one of the most obvious indicators that your Navien tankless water heater needs to be repaired. If you find that the water temperature fluctuates unexpectedly or that hot water runs out too quickly, this could indicate a problem with the unit’s heating system. Possible causes for this issue include:
- Blockage in the heat exchanger: Over time, mineral buildup from hard water can impede heat transmission and lower the heater’s efficiency.
- Bad sensors: Uneven heating and variations in water temperature might be caused by a broken temperature or flow sensor.
If you’re unsure about where these components are located, referring to the Water Heater Parts Diagram can be a helpful guide. This diagram can give you a clear overview of each part of the water heater and help you identify which components might be malfunctioning.
2.Error Codes Displayed on the Control Panel
When a problem arises, a digital control panel on Navien tankless water heaters shows error codes. These error codes provide a valuable diagnostic tool that can help you identify the problem. Some common error codes include:
- Error Code 11: Indicates an ignition problem, which could be related to the gas valve or flame rod.
- Error Code 12: Signals a combustion issue, possibly due to blocked venting or air intake.
- Error Code 13: Refers to a water flow problem, often caused by low water pressure or a clogged filter.
3.Strange Noises Coming From the Unit
If your Navien tankless water heater starts to make strange noises, there may be a systemic issue. Common sounds to watch out for include:
- Popping or banging sounds: These are frequently the result of mineral accumulation in the heat exchanger, which can produce noise-producing steam bubbles.
- Hissing sounds: These could be signs of a venting system problem or a gas leak.
- Whistling sounds: These typically indicate a clogged filter or problems with water pressure.
4.The Heater is Not Starting or Fails to Ignite
There may be a problem with the fuel supply or ignition system if your Navien tankless water heater won’t start or ignite. Among the possible reasons are:
- Faulty ignition parts: The unit may not light if the igniter or flame rod isn’t working properly.
- Gas supply problems: If the gas supply is inadequate or interrupted, the heater may not turn on.
- Airflow issues: Improperly installed or blocked venting can hinder ignition and impact combustion.
5.Water Leaks Around the Unit
Water leaks are a severe problem that needs to be fixed right away. Water accumulating around your Navien tankless water heater may indicate an issue with internal parts. Common causes for leaks include:
- Connections that are loose or broken: Where water pipes attach to the unit, leaks may happen.
- Cracked heat exchanger: Over time, the heat exchanger may crack due to mineral buildup or corrosion, causing leaks.
- Faulty pressure relief valve: If the unit is overpressurized, a broken valve may cause leakage.
6.The Unit is Constantly Shutting Off
If your Navien tankless water heater is turning off unexpectedly or experiencing frequent shutdowns, it could be caused by overheating or electrical issues. Common reasons for this behavior include:
- Overheating: If there is a problem with the flow rate, ventilation, or sensors, the unit may overheat.
- Electrical issues: The unit may shut down due to bad wiring or a broken control board.
- Sensor malfunction: The machine may shut down to prevent damage if the flow or temperature sensors aren’t functioning properly.
7.Fluctuating Water Pressure
Fluctuating water pressure can be a nuisance, especially when using multiple fixtures. The following factors may contribute to irregular water pressure in tankless systems:
- Clogged filters: Mineral buildup or debris in the water filter can disrupt water flow.
- Bad pressure regulator: erratic water pressure can result from a broken regulator.
- Water supply issues: Unstable water supply from the home can also affect the heater’s performance.
Knowing when to repair your Navien tankless water heater is essential to maintaining its lifespan and functionality. Issues should be addressed quickly to prevent costly solutions and preserve optimal performance. Simple troubleshooting can solve certain issues, but a qualified HVAC specialist is required for others. The unit will run effectively and deliver dependable hot water for many years with routine maintenance.
Written by Allen Rode for Partshnc, your trusted source for high-quality HVAC parts, including water heater components, air conditioner parts, and heat pump solutions.
