Navien Error Codes
Tankless Systems are complicated systems and this they can have some errors and electronic issues. We have put together a thorough list of Navien error codes to help you diagnose and potentially fix any issues you may have.
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| CODE | ERROR | QUICK TROUBLESHOOTING | FULL FLASH SOLUTIONS | MOBILE PHONE SOLUTION |
| E001 | Water is boiling in the Heat Exchanger | 1. clean the inlet water straining 2. Check the automatic flow 3. Check the heat exchanger, remove and clean with a solution | 001E OR Power Supply | 001E OR Power Supply |
| E002 | Low Water Pressure | 1. Wait until water supplement is terminated. | Reset Is Automatic | Reset Is Automatic |
| E003 | Ignition Failure | 1. Check to see if the main gas supply is on 2. Check that the power is on 3. Check the igniter for spark | Scenario 1 Scenario 2 Scenario 3 | Scenario 1 Scenario 1 Scenario 1 |
| E004 | False flame detection | 1. Ensure ground wire is connected 2. Check the igniter for spark | 004E | 004E |
| E007 | Hot water outlet: thermistor -open | 1. Check the thermistor 2. Replace the thermistor | 007E | 007E |
| E008 | Hot water outlet: thermistor -short | 1. Check the thermistor 2. Replace the thermistor | 008E | 008E |
| E009 | Abnormal fan motor activity | 1. Check and clean the air filter 2. Check and clean the fan motor | 009E | 009E |
| E010 | Abnormal Air Pressure | 1. Check the vent pipe for obstructions 2. Check and clean the air filter | 010E | 010E |
| E011 | High Water Pressure | 1. Check the water pressure sensor. | Automatic Reset | Automatic Reset |
| E012 | Flame loss | 1. Check the main gas line (valve open?) 2. Check intake air pipe 3. Check the ground wire 4. Check power supply | 012E | 012E |
| E015 | Abnormal control board | 1. Check power supply 2. Check the GFI | Not Defined | Not Defined |
| E016 | Overheating of heat exchanger | 1. Turn off the the for at least 30 minutes ten restart. 2. Clean the inlet water strainer 3. Check the automatic flow adjustment valve 4. Check the heat exchanger: remove and clean with a cleaning solution | 016E | 016E |
| E021 | Cold water inlet: thermistor 1 -open | 1. Check thermistor 2. Replace thermistor | 021E | 021E |
| E022 | Cold water inlet: thermistor 1 -short | 1. Check thermistor 2. Replace thermistor | 022E | 022E |
| E027 | Abnormal activity of the air pressure sensor | 1. Check the vent pipe for obstructions 2. Check and clean the air filter | 027E | 027E |
| E028 | Water leak pipe line | 1. Check pipe line. | Reset – Manual | Reset – Manual |
| E030 | Exhaust overheat: exhaust high limit switch shuts down the unit when the flue temperature exceeds 149 F or 65C | 1. Turn off the the for at least 30 minutes ten restart. 2. Clean the inlet water strainer 3. Check the automatic flow adjustment valve 4. Check the heat exchanger: remove and clean with a cleaning solution | 030E | 030E |
| E032 | Cold water inlet: thermistor 2 -open | 1. Check thermistor 2. Replace thermistor | 032E | 032E |
| E033 | Cold water inlet: thermistor 2 -short | 1. Check thermistor 2. Replace thermistor | 033E | 033E |
| E034 | Abnormal – flow adjustment valve | 1. Check the flow adjustment valve | Not Defined | Not Defined |
| E035 | Abnormal activity of the gas pressure sensor | 1. Check gas line | 035E | 035E |
| E036 | Communication failure | 1. Contact Navien Tech. support | Not Defined | Not Defined |
| E037 | Water leak inside unit | 1. Close cold water main 2. Replace leaking parts | 037E | 037E |
| E038 | Abnormal circulation pump | 1. Check the circulation PUMP. 2. Check the water flow sensor 3. Check the cold water main | Not Defined | Not Defined |
| E039 | Abnormal – water flow sensor | 1. Check the water flow sensor | Not Defined | Not Defined |
| E041 | Hot water outlet: thermistor 2 -open | 1. Check thermistor 2. Replace thermistor | Not Defined | Not Defined |
| E042 | Hot water outlet: thermistor 2 -short | 1. Check thermistor 2. Replace thermistor | Not Defined | Not Defined |
| E043 | Abnormal cascade connection | 1. Check model type | Not Defined | Not Defined |
| E044 | Abnormal thermistor connection | 1. Check thermistor connection | Not Defined | Not Defined |
| E045 | Abnormal – mixing valve | 1. Check the mixing valve | Not Defined | Not Defined |
| E048 | Abnormal LPG gas pressure | 1. Check the LPG gas 2. Fill the LPG gas | Not Defined | Not Defined |
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