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Jason NealSep 8, 2025
What does error E279 mean on my Navien NHB-150 Boiler?
- PPamela CampbellSep 9, 2025
If your Navien Boiler displays error code E279, which indicates an abnormal system return thermistor, the suggested solution is alarm.
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What does error E279 mean on my Navien NHB-150 Boiler?
If your Navien Boiler displays error code E279, which indicates an abnormal system return thermistor, the suggested solution is alarm.
Why is my Navien Boiler's space heating not working?
If the space heating isn't working on your Navien Boiler, first ensure the boiler is powered on and the temperature setting isn't too low. Check that the power is on, plugged into the outlet with the correct voltage, and the boiler is turned on. Raise the setting temperature. Also, the heating side does not work when the unit is heating domestic hot water.
Why is my Navien NHB-150 space heating malfunctioning?
The space heating side might not be working because the temperature setting is too low. Also, when the unit is heating domestic hot water (DHW), the heating side will not function. Ensure the boiler is powered on and not in standby mode, and that the setting temperature is appropriately raised.
What to do if my Navien NHB-150 shows error E001?
If your Navien Boiler displays error code E001, which indicates a heat exchanger over temperature issue, try an auto reset, manual reset, or power on reset.
What does error E594 mean on my Navien NHB-150 Boiler?
If your Navien Boiler displays error code E594, which indicates an abnormal EEPROM (PCB), the suggested solution is alarm.
What does error E736 mean on my Navien NHB-150?
If your Navien Boiler displays error code E736, which indicates an abnormal cascade communication, the suggested solution is alarm.
What does error E205 mean on my Navien NHB-150?
If your Navien Boiler displays error code E205, which indicates an abnormal heating supply thermistor, try an auto reset.
What to do if my Navien NHB-150 Boiler is showing error E777?
If your Navien Boiler displays error code E777, which indicates an abnormal LWCO limit (external device), try an auto reset.
What should I do if my Navien NHB-150 Boiler displays error E291?
If your Navien Boiler displays error code E291, which indicates a supply/return inversion limit, try a manual reset or a power on reset.
What to do if Navien NHB-150 shows error E109?
If your Navien Boiler displays error code E109, which indicates an abnormal fan motor operation, try a manual reset or a power on reset.
General| Model | NHB-150 |
|---|---|
| Category | Boiler |
| Maximum Input | 150, 000 BTU/h |
| AFUE | 95% |
| Vent Type | Direct Vent |
| Fuel Type | Natural Gas or Propane |
| Min. Input (NG) | 15, 000 BTU/h |
| Min. Input (LP) | 15, 000 BTU/h |
| Voltage | 120 V |
| Water Connection Size | 1 inch NPT |
| Gas Connection Size | 3/4 inch NPT |
| Vent Diameter | 3" |
Important safety warnings and precautions for safe operation and installation.
Covers safety definitions, symbols, and essential precautions for boiler operation.
Categorizes and explains error codes, providing self-diagnostic and action steps.
