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Dana HarperJul 28, 2025
Why is my Navien NFC space heating not working?
- GgmunozJul 28, 2025
If your Navien Boiler's space heating isn't working, first ensure the power is on and the unit is plugged into an outlet with the correct voltage. Press the Power button and increase the set temperature to ensure the boiler is on. Also, when the unit is heating domestic hot water (DHW), the heating side will not operate. Finally, check and clean the filters on the heating side, as a restricted filter can cause malfunction.