Troubleshooting Common Navien Tankless Water Heater Issues

Navien tankless water heaters provide convenient and efficient water heating solutions. Like any appliance, they sometimes encounter issues. This guide helps homeowners troubleshoot and resolve these problems.

Importance of Troubleshooting:

• Avoid discomfort and inconvenience from lack of hot water
• Prevent potential damage from leaks or malfunctions
• Save money on costly professional repairs

Understanding Error Codes:

Navien heaters display error codes to indicate specific problems. Some common errors include:

• E001: Ignition Failure (check igniter, flame sensor, gas pressure, burner intake)
• E003: Ignition Sequence Error (check gas pressure, flame sensor, gas valve, control board)
• E012: Inlet Water Temperature Sensor Fault (check wiring, sensor, debris)
• E013: Outlet Water Temperature Sensor Fault (check wiring, sensor, debris)

Common Problems and Solutions:

• Heater Won't Ignite:
  • Verify gas supply is on
  • Remove debris from air intake and exhaust vents
  • Reset high limit switch
  • Contact a professional for control board or igniter issues
• Lack of Hot Water:
  • Increase water flow
  • Clean water inlet filter
  • Flush heat exchanger to remove scale
  • Check flow sensor
  • Inspect burner for obstructions
• Leaking Water:
  • Tighten loose connections
  • Check relief valve
  • Have heat exchanger inspected by a technician
  • Reduce condensation by adding pipe insulation
• High Energy Bills:
  • Check for water leaks
  • Verify temperature setting is appropriate
  • Have technician inspect components and remove scale buildup
  • Replace defective burner or flow sensor

Preventive Maintenance:

• Annual professional maintenance
• Flushing to prevent scale buildup
• Checking gas and water pressure
• Replacing filters and gaskets
• Keeping vents and intakes clear
• Monitoring error codes

Following these troubleshooting steps and implementing preventive measures helps homeowners maintain their Navien tankless water heaters and provide a reliable and efficient hot water supply.