E001 |
Water is boiling in the Heat Exchanger |
1. clean the inlet water straining2. Check the automatic flow
3. Check the heat exchanger, remove and clean with a solution |
E003 |
Ignition Failure |
1. Check to see if the main gas supply is on2. Check that the power is on
3. Check the igniter for spark |
E004 |
False flame detection |
1. Ensure ground wire is connected
2. Check the igniter for spark |
E007 |
Hot water outlet: thermistor -open |
1. Check the thermistor
2. Replace the thermistor |
E008 |
Hot water outlet: thermistor -short |
1. Check the thermistor
2. Replace the thermistor |
E009 |
Abnormal fan motor activity |
1. Check and clean the air filter
2. Check and clean the fan motor |
E010 |
Abnormal Air Pressure |
1. Check the vent pipe for obstructions
2. Check and clean the air filter |
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 |
E015 |
Abnormal control board |
1. Check power supply
2. Check the GFI |
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 |
E021 |
Cold water inlet: thermistor 1 -open |
1. Check thermistor
2. Replace thermistor |
E022 |
Cold water inlet: thermistor 1 -short |
1. Check thermistor
2. Replace thermistor |
E027 |
Abnormal activity of the air pressure sensor |
1. Check the vent pipe for obstructions
2. Check and clean the air filter |
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 |
E032 |
Cold water inlet: thermistor 2 -open |
1. Check thermistor
2. Replace thermistor |
E033 |
Cold water inlet: thermistor 2 -short |
1. Check thermistor
2. Replace thermistor |
E034 |
Abnormal – flow adjustment valve |
1. Check the flow adjustment valve |
E035 |
Abnormal activity of the gas pressure sensor |
1. Check gas line |
E036 |
Communication failure |
1. Contact Navien Tech. support |
E037 |
Water leak inside unit |
1. Close cold water main
2. Replace leaking parts |
E038 |
Abnormal circulation pump |
1. Check the circulation PUMP.
2. Check the water flow sensor
3. Check the cold water main |
E039 |
Abnormal – water flow sensor |
1. Check the water flow sensor |
E041 |
Hot water outlet: thermistor 2 -open |
1. Check thermistor
2. Replace thermistor |
E042 |
Hot water outlet: thermistor 2 -short |
1. Check thermistor
2. Replace thermistor |
E043 |
Abnormal cascade connection |
1. Check model type |
E044 |
Abnormal thermistor connection |
1. Check thermistor connection |
E045 |
Abnormal – mixing valve |
1. Check the mixing valve |
E048 |
Abnormal LPG gas pressure |
1. Check the LPG gas
2. Fill the LPG gas |