Cleaning The Air Intake Filter - Navien NFB-175H User's Information Manual

5. Remove the drain cap on the manifold system
to drain the boiler.
Drain Cap
Place a bucket under the boiler
Note
●
to gather water released from the
manifold system.
Do not allow the pump to become
●
wet.

4.3 Cleaning the Air Intake Filter

If the air intake filter becomes clogged by dust
or lint, the boiler will cease to operate and "Error
Code 110" will appear on the front panel display.
To properly maintain the boiler, clean the air
intake filter as needed or as part of the annual
maintenance.
To clean the air intake filter:
1. Press the Power button (
to turn off the boiler.
Drain Cap
2. Disconnect the power supply to the boiler.
3. Unfasten the 4 latches (2 at the top and 2 at the
bottom) to remove the front cover.
) on the front panel
Maintaining the Boiler 15