Navien tankless water heaters are renowned for their efficiency, reliability, and innovative features. However, like any appliance, they may occasionally encounter problems. If you encounter an error code on your Navien tankless water heater, don’t fret! This comprehensive guide will delve into the world of Navien tankless water heater error codes, providing their meanings and troubleshooting steps to help you resolve the issue effectively.
Understanding Navien Tankless Water Heater Error Codes
Navien tankless water heaters utilize error codes to indicate potential problems or malfunctions. These codes are typically displayed on the water heater’s control panel, either as alphanumeric codes (e.g., E04) or as descriptive error messages (e.g., “Overheat limit error”).
Error codes can be categorized into two main groups:
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Hardware-related error codes: These codes signify issues with the physical components of the water heater, such as faulty sensors, motors, or valves.
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System-related error codes: These codes indicate problems with the overall water heating system or its operation, such as water flow issues, temperature control problems, or communication errors.
Common Navien Tankless Water Heater Error Codes
Below is a table outlining some of the most common Navien tankless water heater error codes and their meanings:
| Error Code | Description |
|---|---|
| E01 | Ignition failure |
| E02 | Overheat limit error |
| E03 | Flame loss error |
| E04 | Low water pressure error |
| E05 | Air in system error |
| E06 | Overheat shutdown error |
| E07 | Lockout error |
| E08 | Communication error |
| E09 | Blower fault error |
| E10 | Sensor fault error |
| F01 | Main PCB error |
| F02 | Sub PCB error |
| F03 | Burner control error |
| F04 | Gas valve error |
| F05 | Water flow sensor error |
| F06 | Overheat sensor error |
| F07 | Communication error between main PCB and sub PCB |
| F08 | Temperature sensor error |
Troubleshooting Navien Tankless Water Heater Error Codes
Before attempting to troubleshoot any error code, it’s crucial to prioritize safety by following these guidelines:
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Turn off the gas supply: Locate the gas shut-off valve and turn it to the “off” position to prevent any gas leaks.
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Disconnect the water supply: Identify the water inlet valves and turn off the water supply valves to prevent any water damage.
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Consult the Navien tankless water heater user manual: The user manual provides detailed instructions and troubleshooting guidance for specific error codes.
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Seek professional assistance: For complex error codes or issues that require specialized knowledge, consult a qualified Navien technician or plumber.
Resolving Common Navien Tankless Water Heater Error Codes
Here’s a summary of general troubleshooting steps for common Navien tankless water heater error codes:
E01 (Ignition failure): Check the gas supply to ensure it’s properly connected and the gas valve is open. Clean the gas inlet filter and replace the gas valve if necessary.
E02 (Overheat limit error): Check the water temperature to ensure it’s not exceeding the set limit. Clean the heat exchanger and check for any obstructions in the water flow.
E03 (Flame loss error): Check for any obstructions in the air intake or exhaust pipes. Clean the flame sensor and replace it if necessary.
E04 (Low water pressure error): Check the water pressure gauge to ensure it’s within the specified range. If the pressure is low, add water to the system or check for leaks.
E05 (Air in system error): Bleed the air out of the system by opening the bleed valve on the water inlet side.
E06 (Overheat shutdown error): Check the water temperature and adjust the thermostat or aquastat. Clean the heat exchanger and check for any obstructions in the water flow.
E07 (Lockout error): Reset the water heater to clear the lockout. If the lockout persists, contact a qualified technician.
E08 (Communication error): Check the connections between the control panel and the main PCB. If the connections are secure, replace the main PCB.
E09 (Blower fault error): Check the blower motor and its connections. If the motor is damaged, replace it.
E10 (Sensor fault error): Check the