Fuse; Fan (Combustion Air) - Navien NHB-055 Service Manual

6.2.2 Fuse

1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Locate the fuse housing shown in Figure 3 below. Open the
housing to expose the fuse.
4. Replace the old fuse with the new part.
5. Ensure that the new fuse is of an equivalent rating and that it is
properly fixed inside the housing.
6. Close the fuse housing.
7. Turn on water supply, power supply, and gas supply to the
unit.

6.2.3 Fan (Combustion Air)

1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Remove the Front Panel and Controller(refer to page 126)
4. Remove the 4 screws from the Gas Pipe.
Version 1.0
Figure 3
Figure 4
5. Remove the Clip from the Strainer and the 3 screws from the
Base.
Figure 5
Figure 6
Figure 7
Figure 8
NHB Service Manual 127