Cleaning The Heating Return Water Filter (Space Heating Side); Cleaning The Air Intake Filter - Navien NCB-190/060H User's Information Manual

4.4 Cleaning the Heating Return
Water Filter (Space Heating side)
If the heating performance is decreased, you can
increase the heating performance by filtering
impurities from the system.
To clean the filter:
1. Drain the space heating side of the boiler. Refer
to "4.2 Draining the Boiler" on page 14.
2. While the filter is removed, rinse it with clean
running water (cold) and, if necessary, scrub it
clean with a brush.
3. Reinsert and tighten the filter.
4. Fill the boiler and check for proper operation.
16 Maintaining the Boiler

4.5 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 every 3-4 months.
To clean the air intake filter:
1. Press the Power button (
to turn off the boiler.
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 and gain
access to the internal components.
) on the front panel