Navien tankless water heaters are known for their efficiency and on-demand hot water, but like any appliance, they can experience malfunctions. Understanding Navien error codes is crucial for troubleshooting and resolving issues quickly. This guide provides a comprehensive overview of common Navien tankless water heater error codes, their causes, and solutions. We'll also address some frequently asked questions to help you become a Navien troubleshooting expert.
Understanding Navien Error Codes
Navien tankless water heaters display error codes through a series of flashing lights or digital displays on the unit's control panel. These codes indicate specific problems that require attention. While some issues are minor and easily fixable, others may require professional service. Always consult your owner's manual for the most accurate and up-to-date information specific to your model. The information below covers common codes, but model variations exist.
Common Navien Tankless Water Heater Error Codes and Solutions
The following sections detail some of the most frequently encountered Navien error codes. Remember to always turn off the power to the unit before attempting any troubleshooting or repairs.
Error Code 11 (or similar variations indicating inlet water temperature):
This code usually signifies a problem with the inlet water temperature. This could be due to:
- Low Water Pressure: Check your main water supply. Low pressure can prevent sufficient water from reaching the unit. Contact your water utility company if necessary.
- Frozen Water Pipes: If it's cold outside, frozen pipes can restrict water flow. Allow pipes to thaw before restarting the unit.
- Clogged Water Filter: A clogged water filter restricts water flow. Locate and replace the filter (consult your owner's manual for location and replacement instructions).
Error Code 12 (or similar variations indicating flow):
This error typically indicates insufficient water flow. Possible causes include:
- Low Water Pressure (as above): Again, check your main water supply for adequate pressure.
- Clogged Pipes or Filters: Check for obstructions in your plumbing system, including the water filter.
- Faulty Flow Sensor: A malfunctioning flow sensor might not be accurately detecting water flow. This requires professional servicing.
Error Code 16 (or similar variations indicating overheating):
This code suggests the unit is overheating. Several factors could contribute to this:
- Insufficient Water Flow: Low water flow can cause the unit to overheat. Check for flow issues as detailed above.
- Scale Buildup: Mineral deposits (scale) can impede heat transfer and cause overheating. Regular flushing or descaling is essential to prevent this (refer to your owner's manual for descaling instructions).
- Faulty Temperature Sensor: A malfunctioning temperature sensor might not be accurately reading the water temperature, leading to overheating. Professional service is needed in this case.
Error Code 20 (or similar variations indicating combustion):
Error codes related to combustion generally indicate issues with the gas supply or ignition system. This requires immediate attention from a qualified technician:
- Gas Supply Problems: Check your gas supply line for any blockages or leaks. Never attempt to repair gas lines yourself.
- Ignition Problems: Issues with the igniter, flame sensor, or gas valve can disrupt combustion. Professional repair is essential.
Error Code 99 (or similar variations indicating a general malfunction):
This code represents a general malfunction. It's a broad indicator and typically requires professional diagnosis and repair.
Other Potential Problems and Solutions
Beyond specific error codes, several other issues might affect your Navien tankless water heater's performance:
- Lack of Hot Water: Check water pressure, gas supply, and ensure the unit is properly powered.
- Erratic Hot Water Temperature: This could be due to scale buildup, low water pressure, or a faulty temperature sensor.
- Unit Not Turning On: Check power supply, gas supply, and circuit breaker.
Maintaining Your Navien Tankless Water Heater
Regular maintenance is crucial for the longevity and efficient operation of your Navien tankless water heater. This includes:
- Annual Flushing/Descaling: Removing scale buildup extends the life and efficiency of the unit.
- Regular Filter Replacement: Replacing the water filter as recommended maintains optimal water flow.
- Professional Inspections: Schedule annual inspections by a qualified technician to identify potential problems early on.
This guide offers general information. Always consult your owner's manual for specific instructions and troubleshooting steps relevant to your Navien model. If you're uncertain about any repair, contact a qualified service technician to avoid further damage or injury.
