Cleaning The Heat Exchanger - Navien NCB-20LHWE Installation & Operation Manual

13.2 Cleaning the Heat Exchanger

WARNING
Before cleaning the heat exchanger, make sure the boiler is
o .
To properly maintain the boiler, you should clean the heat
exchanger annually.
To clean the heat exchanger:
1. Press the Power button on the front panel to turn o the
boiler.
2. Disconnect the power supply to the boiler.
3. Turn o both gas and water supply to the boiler.
Wait at least 30 minutes for the heat exchanger to
Note
cool down.
4. Using a Phillips screwdriver, remove four screws (two at the
bottom and two at the top) of the front cover assembly to
gain access to the internal components.
5. Once the front cover is removed, place it in a safe location to
prevent accidental damage.
6. Loosen the four screws holding the front panel and remove
the front panel.
When removing the front panel, label all wires and
Note
make sure all wires are disconnected.
Appendices 67